Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites

Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites Jose Fernando Padilha, Roger Frety, Alane P. Santos, Luiz A. M. Pontes, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-224425/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 27 Jun, 2021 Read the published version in Waste and Biomass Valorization → Version 1 posted 5 You are reading this latest preprint version Abstract One way to take advantage from out of specification biodiesel and waste from biodiesel tank bottom drainage is to co-process them in a fluidized catalytic cracking (FCC) unit. The present work deals with the cracking of oleic acid methyl ester (OAME) as a biodiesel model, under conditions close to that of FCC process over ZSM-5 and Y zeolites, either in protonated or sodium forms, for the production of deoxygenated compounds. Catalytic fast cracking of OAME pre-adsorbed on the catalyst surface was performed, with a catalyst:OAME mass ratio of 10:1 in a micro-pyrolysis system at 650°C, coupled to a GC/MS for on line analysis of the products. Results show that the cracking of OAME without a catalyst favored the formation of linear alkenes and polyenes. Fast cracking of OAME over HZSM-5 and HY acidic zeolites led to the production of aromatics, due to hydrogen transfer. Cracking over NaY and HY zeolites produced remarkable amounts of ramified saturated hydrocarbons. The formation of alkylated hydrocarbons was not significant over ZSM-5 zeolite probably due to a small pore size of this zeolite. NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). Low acidic zeolites favored the production of non-aromatic hydrocarbons. Product distribution was affected by catalyst shape selectivity and acidity. These results show that residues from the biodiesel chain can be directly co-processed in FCC units to obtain high value hydrocarbons, mainly in the jet fuel and gasoline ranges. Chemical Engineering Biodiesel cracking co-processing fast pyrolysis hydrocarbons zeolite Figures Figure 1 Figure 2 Statement of Novelty This work shows that oleic acid methyl ester as a model of residues from off-spec biodiesel and waste from biodiesel tank bottom drainage can be directly co-processed in a FCC unit, using ZSM-5 and Y zeolites as catalysts in H- and Na-form. The use of such residues in FCC process can promote the production o high value hydrocarbons, mainly in the jet fuel and gasoline ranges. These results may be of great interest to the growing market for renewable jet fuel since the aviation industry is committed to reduce CO2 emissions towards zero net carbon emissions. To the best of our knowledge, such a systematic study has not been reported yet. 1. Introduction The emission of greenhouse gases from the high consumption of fossil fuels has recently been the cause of the hottest years and extreme weather events [ 1 ]. The use of biofuels has increased significantly to attain a sustainable economy and independence from fossil sources. The use of biodiesel as a diesel additive requires a rigorous quality control of this biofuel [ 2 – 3 ]. Biodiesel is subjected to chemical modification due to the double bonds of the methyl esters with one, two or three C = C which can be easily oxidized. The chemical modifications of the biodiesel can be due to storage conditions such as exposure to air, humidity, light and temperature or to the presence of metals that have a catalytic activity for oxidation or polymerization reactions. The oxidized products are organic acids, hydroperoxides and aldehydes that cause corrosion problems to engine [ 4 – 5 ]. Polymerization reactions can produce gums, generating solid deposits in pumps and filters leading to engine operation problems. These products as well as microbial growth affect the quality properties of the biodiesel [ 6 ]. Finally, a limited quality biodiesel can appear when problems in the production process lead to the formation of an off-spec product with excess impurities such as soaps, glycerol or catalyst [ 7 – 8 ]. Another concern is the addition of an antioxidant to avoid the degradation of biodiesel. Antioxidants may affect the clean-burning characteristic of biodiesel. The addition of up to 1000 ppm of different kinds of commercial antioxidants led to the increase of hydrocarbons and CO emissions when blends of 20 vol% of biodiesel in diesel are burned in a diesel engine [ 9 ]. Then, off-spec biodiesel and waste from biodiesel tank bottom drainage become a feedstock candidate for deoxygenated biofuels production. The thermal cracking of methyl esters of canola and soybean oils, at 440°C, was studied by Luo et al [ 10 ] in a Parr type reactor, under autogenous pressure or hydrogen. Whereas the vegetable oil transformations produced as cracked products some fatty acids, alkanes and alkenes, the esters transformation produced small chain esters, alkanes and alkenes, without large differences between the various yields. These authors also showed that soybean oil and esters produced lighter products, due to a higher unsaturation of the carbon chain fatty acids, increasing the number of C-C bonds able to crack. Seames et al [ 11 ], of the same research group, studied the thermal conversion of long chain esters and suggested that cracking is an excellent way to obtain esters with a smaller carbon chain, resulting in better physical properties for potential kerosene type fuel. They needed, however, a distillation step at 300°C, to decrease the residual oxygen content of the whole bio-oil obtained. Hydrodeoxygenation (HDO) of methyl esters was also reported in the presence of supported metal catalyst. Han et al. [ 12 ] studied the HDO of methyl stearate diluted in hexane at 270°C, under 16 bar H 2 over 5%Pd/BaSO 4 , obtaining 99% conversion and 97% heptadecanoate selectivity that corresponds to diesel range. Dhillon and Vasudevan studied the deoxygenation of methyl oleate and commercial biodiesel over WO3/γ-Al2O3 and Ni- WO3/γ-Al2O3 catalysts [ 13 ]. According to Bezergianni et al. [ 14 ], the NiMo catalyst favors complete hydrodeoxygenation of glycerol tristearate producing C18 and C3 alkanes + 6H 2 O, in a reaction more hydrogen-consuming than hydrodecarboxylation favored by NiW catalyst, producing C17 and C3 alkanes + 3CO 2 . However, these HDO processes consume a large amount of hydrogen and require expensive high pressure hydrogen facilities. Deoxygenation of fatty esters can be performed without hydrogen consumption over acidic and metal catalysts. The deoxygenation of methyl octanoate on acidic H-ZSM5 produced C1-C7 hydrocarbons, with significant amounts of aromatics. Octanoic acid and 8-pentadecanone were formed as primary products from the hydrolysis of methyl octanoate, followed by condensation [ 15 ]. Bayat et al. [ 16 ] studied the cracking of canola oil methyl ester on HZSM-5 at 375°C, and obtained 75 % of liquid products containing 57 % of aromatics, mainly xylenes, toluene and C9 aromatics. Chiappero et al. [ 17 ] studied the deoxygenation of methyl octanoate over Pt/SiO2 catalyst under helium at 350°C, in a reactive distillation system. They obtained 56 % C7 alkanes and 40 % C7 alkenes. Sancheti [ 18 ] studied the deoxygenation of methyl palmitate diluted in n-hexane over a Ni5Mo10K/TS-1 (titanosilicate) catalyst at 380°C, obtaining 29% conversion and selectivity of 87% to C15 alkenes and 8% to C15 alkanes. To lower the cost, a deoxygenation process can take place in an existing industrial facility such as the FCC process. FCC is a catalytic process transforming large molecules of petroleum feedstocks to lighter ones, compatible with gasoline, kerosene and diesel fuels. Co-processing of FCC petroleum feedstocks with oxygenated molecules, such as those obtained from biomass processing [ 14 , 19 – 20 ] and triglycerides from vegetable oils [ 21 ], has been reported. Results showed that up to 10 mass % of oxygenated molecules can be added to petroleum cuts without decreasing the yields of useful products [ 19 ]. During the cracking process, FCC catalysts that contain acidic zeolites as active phase are permanently deactivated and regenerated. The addition of controlled amounts of oxygenated molecules during cracking seems ineffective in decreasing the lifetime of the catalysts [ 19 , 21 ]. Therefore, it can be important to further study the cracking of other oxygenated molecules such as fatty acid ester under conditions close to that of FCC process [ 22 ]. To simulate a bench-scale FCC process, a fixed-bed microactivity test (MAT) unit is generally used. However, this type of reactor presents differences in comparison to the industrial process related to (i) the fluid dynamics of the fluidized reactor compared to fixed bed; (ii) the short contact times that in the FCC reactor vary from 2 to 10 s; and (iii) the stripping of the reaction products in the MAT system [ 23 ]. In a preceding study, some of us [ 24 ] suggested that the micropyrolysis of fatty compounds preadsorbed on catalyst surface can be used to screen some catalytic properties, as catalytic micropyrolysis generates a large spectrum of organic products. As the experimental conditions used were close to those used in FCC process, with high heating rates, and a catalyst:feed mass ratio close to 9, such procedure can in part simulate what occurs in a FCC riser. The present work aims at studying deoxygenation of oleic acid methyl ester close to FCC conditions in absence or presence of Y and ZSM-5 zeolites, in both protonated and sodium forms, to investigate the formation of deoxygenated products and their distribution. Y zeolites and ZSM-5 are typical zeolites used in FCC catalysts. 2. Experimental 2.1.Catalysts Starting catalysts samples were NH 4 ZSM-5 (Si/Al = 15) and NH 4 Y (Si/Al = 6) materials from Zeolyst, in powder form. These samples were heat treated at 600 °C under static air to obtain the acid forms HZSM-5 and HY, respectively. These new samples were then exchanged with aqueous solution of sodium nitrate (5 mol L –1 ) for one hour, washed with deionized water to remove nitrate ions, dried at 110 °C and heat treated under static air at 500 °C for 3 hours. This exchange procedure was repeated three times. Final samples are referred to as NaZSM-5 and NaY. 2.2.Mixtures of oleic acid methyl ester and catalyst Oleic acid methyl ester (Sigma Aldrich) was impregnated onto H- and Na-zeolites, after drying at 110 °C, by dropping micro amounts of the pure organic molecule onto powdered zeolites, under constant manual mixing. The mass ratio of catalyst:oleic acid methyl ester was 10:1. At the end of this process, samples were still in their initial powder form. These impregnated samples are thereafter referred to OAME/catalyst, catalyst representing H- or Na-zeolite. 2.3.Pyrolysis experiments Cracking experiments have been performed in a micropyrolyzer Pyroprobe 5200 CDS Analytical set up described in previous works [25–26]. The cracking temperature was fixed at 650 °C for 15 seconds, which is higher than the FCC raiser feed temperature (500 °C) and lower than the temperature of the incoming FCC regenerated hot catalyst (715 °C) [27]. The heating rate of the pyrolysis space, by a platinum coil resistance, was estimated to be 1,000 °C min -1 . The sample mass of catalyst impregnated with OAME was about 1.5 mg. The sample was placed in a quartz tube, between two quartz wool plugs. The sample was submitted to a helium flow rate of 150 mL min -1 . Cracked products (up to 400 compounds) and untransformed feed were separated in a GC/MS apparatus Shimadzu QP2010. The GC program started at 45 °C for 5 min, heating ramp of 4 °C min -1 , and final temperature of 280 °C. Split injector temperature was 250 °C and split ratio was 30:1. GC column was a DB-5MS (30 m x 0.25 mm x 0.2 µm). The temperature of MS interface was 290 °C and that of the ion source was 250 °C. MS operated in scan mode with m/z range of 40-400. Deoxygenated products were identified with the help of the NIST data library with similarity equal to or higher than 90%. A standard mixture of hydrocarbons was used to help identify the products: PIANO Mix from Sigma-Aldrich/Supelco, Bellefonte, PA, USA. Due to a large number of products, the deoxygenated compounds were grouped by summing peak areas of specific molecules or molecule families. To classify the different families of compounds, the products were first separated as unidentified, oxygenated and deoxygenated compounds, i.e. hydrocarbons. Deoxygenated molecules were further separated as alkanes, alkenes, polyenes and aromatic compounds. Among saturated and monounsaturated hydrocarbons, linear, cyclic and ramified molecules were further associated. Separation between single benzene ring and molecules with multiple benzene rings was also considered. Deoxygenated molecules were also associated in three families of hydrocarbons, C3-C7, C8-C12 and C12+ to estimate the type of products able to be added or upgraded to gasoline, kerosene or diesel cuts. 3. Results And Discussion In all cases of oleic acid methyl ester (OAME) cracking, between 20 to 30% of pyrogram total area was due to unidentified and products with similarity identification between 60 and 75%. This value is higher than that of unidentified products estimated when cracking myristic acid and palmitic acid as model molecules [ 26 , 28 ]. This fact implies a more complex mechanistic scheme during cracking of unsaturated fatty molecules [ 25 , 29 ] when compared to the scheme retained during cracking of saturated fatty acids which is attributed essentially to decarboxylation and decarbonylation reactions, in agreement with the literature data [ 30 – 33 ]. In the present case, a complete deoxygenation of the oleic acid methyl ester (OAME) was not obtained. But, in their majority, the remaining oxygenated compounds were susceptible to further decomposition when the contact time between catalyst and reactant and/or intermediate products was increased. Therefore, it was expected that the general trends in the product distribution observed in this work would be maintained with a higher degree of decomposition of the feed. 3.1.Cracking of pure oleic acid methyl ester in absence of catalyst Oleic acid methyl ester C18:1 (OAME) pyrogram after cracking at 650°C in absence of catalyst is presented in Fig. 1 . The pyrogram can be divided into two main domains. The left part region, below retention time close to 33 min, where peaks rather well separated of limited size appear; and the right part, above retention time of 33 min, where peaks, poorly separated, of important size are observed. The larger peak in this second region (retention time close to 50 min) is due to untransformed OAME. Product classes reported in Table 1 show that thermal cracking of OAME at 650°C produced only 4.3% of deoxygenated compounds, essentially associated to peaks below retention time of 33 min. In the right part of the pyrogram, many oxygenated and unidentified products are present. Along all the pyrogram, a large amount of carboxylic acid methyl esters was observed (75.1%), i.e. methyl esters of C2 to C18 saturated and unsaturated carboxylic acids. This result implies that under these conditions, cracking of OAME and methyl esters of lower chain length can occur not only close to the carboxylate position, but also within the hydrocarbon chain, probably in the beta position of the C = C bond. The presence of all chain lengths between the C2 and C19 methyl esters suggests also an important migration of the C = C double bond position before cracking occurs. Although the number of hydrocarbons (HC) observed from pure OAME cracking is low, the HC production is much higher after cracking in presence of catalysts studied. 3.2.Cracking of oleic acid methyl ester adsorbed on zeolites The cracking of OAME impregnated on zeolite catalysts at 650°C presented a higher degree of reaction than the cracking of pure OAME. Figure 1 shows together with that of pure OAME, the pyrograms of OAME/HY, OAME/NaY, OAME/HZSM-5 and OAME/NaZSM-5. The cracking of OAME in contact with zeolites presented a higher degree of transformation than the cracking of pure OAME. The quantitative results are shown in Table 1 . The area % of hydrocarbons varies from 24 to almost 40% in presence of catalysts while this value is only 4.3% for the cracking of OAME in absence of catalysts. Simultaneously, the number of oxygenated compounds decreased in the catalytic cracking. Therefore, both acidic and sodium zeolite catalysts helped the deoxygenation of OAME, in the same way they favored deoxygenated products as reported in the case of fatty acids cracking [ 24 ]. The number of produced hydrocarbons over HY and NaY was practically the same. However, the number of hydrocarbons over HZSM-5 was much higher than over NaZSM-5, suggesting that the acid sites in HZSM-5 are more effective in producing the deoxygenation reactions. In all cases, the number of unidentified compounds is higher when cracking is performed in presence of catalyst, suggesting more complex reaction schemes. Table 1 Product family distribution after cracking of oleic acid methyl ester (OAME) at 650°C, pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts. Catalyst Unidentified Oxygenated Hydrocarbons Pure OAME 11.2 84.5 4.3 OAME/NaZSM-5 18.1 57.4 24.5 OAME/HZSM-5 19.1 41.9 39.0 OAME/NaY 36.1 26.4 37.5 OAME/HY 15.7 45.1 39.2 Table 2 summarizes a first association of hydrocarbon families obtained after cracking of OAME. In the case of pure OAME, cracking produced mainly linear alkenes, the majority of them being 1-alkenes. These alkenes are an important class of products in the cracking of saturated fatty acids, as the main decomposition mechanism is due to simple decarbonylation [ 28 , 33 ]. The second class of important products has been observed to be polyunsaturated molecules, including dienes, trienes and alkynes. In the presence of all catalysts, the cracking of OAME produced a high number of aromatics. Protonated catalysts HZSM-5 and HY were more effective for aromatization than sodium catalysts NaZSM-5 and NaY, respectively. The second most important hydrocarbon family was that of alkenes in the case of NaZSM-5, HZSM-5 and NaY. In the case of HY, the second most important group was that of alkanes. Table 2 Hydrocarbon family distribution after cracking at 650°C of oleic acid methyl ester (OAME), pure and in the presence of NaZSM-5, HZSM-5, NaY and HY catalysts. Catalyst Alkanes Alkenes Polyenes Aromatics OAME 0.6 2.3 1.3 0.1 OAME/NaZSM-5 0.0 10.0 0.0 14.0 OAME/HZSM-5 2.1 13.1 1.6 22.2 OAME/NaY 7.8 11. 8 0.6 16.8 OAME/HY 12.7 3.6 2.1 20.0 Table 3 details the distribution of saturated and unsaturated products. Whereas more linear alkanes appear in the case of OAME cracking over HZSM-5, the presence of ramified alkanes is remarkable when OAME cracking was performed over both NaY and HY zeolites. In the case of alkenes, whereas more linear alkenes appear with OAME/NaZSM-5 and OAME/HZSM-5, ramified alkenes show the highest content in the cracking with OAME/NaY, OAME/HZSM-5 and OAME/HY. Therefore, in a systematic way, Y type zeolite presents a more important alkylation property than ZSM-5 type zeolite, probably due to acid sites of stronger strength or in greater numbers [ 34 ]. In fact, although acidity measurements were difficult to obtain under the present experimental conditions, an estimation based on Si/Al ratio [ 35 ] suggests that the number of acid sites is probably two times more important with HY (with Si/Al = 6) than with HZSM-5 (with Si/Al = 15). The higher the Al content, the higher the acidity. Another explanation is the occurrence of shape selectivity. The pore size of the Y zeolite (7.4 Ǻ) is larger than that of ZSM-5 (5.1–5.6 Ǻ) zeolite, enabling alkylation reactions which require more space inside the porous structure [ 36 – 37 ]. It is also important to recall that 1-alkenes represent more than 50% of all alkenes in the case of thermal cracking of pure OAME and cracking in presence of NaZSM-5. On the contrary, in the other cases, small amounts of 1-alkenes are identified, when present. All three HZSM-5, Na/Y and HY catalysts favor the formation of cyclic and internal linear alkenes, eventually alkylated. These three zeolites show therefore a high capacity of isomerization, probably due to higher number of acidic sites existing on their surface. In the case of Y-based catalysts, the larger pore size compared to that of HZSM-5 may also favor molecules with higher kinetic diameter, i.e. ramified ones, as commented above. Table 3 Distribution of alkane and alkene hydrocarbon families into linear, cyclic and ramified classes, after cracking at 650°C of oleic acid methyl ester (OAME), pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts. Catalyst Linear Alkanes Cyclo-Alkanes Ramified Alkanes Linear Alkenes Cyclo-Alkenes Ramified Alkenes OAME 0.2 0.1 0.3 1.8 0.5 0.4 OAME/NaZSM-5 0.0 0.0 0.0 7.4 1.5 2.6 OAME/HZSM-5 1.8 0.3 0.3 5.7 2.3 7.0 OAME/NaY 0.5 2.3 7.2 2.1 1.6 9.6 OAME/HY 0.4 1.3 12.2 0.3 0.9 3.3 Table 4 presents the distribution of aromatic compounds. The formation of aromatics was not significant in the case of thermal cracking of OAME. On the contrary, as said above, the formation of aromatic molecules is very impressive when OAME is cracked over zeolite samples. HY and HZSM-5 zeolites showed a higher aromatization capacity than the sodium exchanged ones. Whereas a high number of molecules containing a single benzene ring are present with OAME/NaZSM-5 and OAME/HZSM-5, molecules containing more than one benzene ring are identified in a significant way during the cracking of OAME adsorbed on Y type zeolites. In the case of OAME/HY, polyaromatic compounds with 3 benzene rings were detected, suggesting an important possibility of coking of this catalyst during cracking of OAME. The formation of mono aromatic hydrocarbons may be associated with the dehydrogenation of six carbon numbered cyclic alkanes and alkenes [ 32 , 38 ]. Polyaromatic hydrocarbons, on the other hand, are formed through the polymerization and dehydrogenation of mono alkyl aromatics [ 23 ] and alternatively through an intramolecular radical cyclization mechanism [ 38 ]. It is known that polyaromatics are generally considered as potential precursors of coke [ 39 – 40 ]. This behavior, together with the hydrogenation properties shown by Y type zeolite must be linked to strong acidic properties of Y zeolite and to hydrogen transfer phenomena, leading on one hand to rather large number of saturated hydrocarbons, and on the other hand to strongly dehydrogenated polyaromatic molecules. Table 4 Distribution of monoaromatic and polyaromatic product families after cracking at 650°C of oleic acid methyl ester (OAME), pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts. Catalyst Monoaromatics Polyaromatics OAME 0.0 0.1 OAME/NaZSM-5 13.6 0.4 OAME/HZSM-5 17.4 4.8 OAME/NaY 9.3 7.5 OAME/HY 12.3 7.7 Figure 2 summarizes the quantities of hydrocarbons associated to the carbon chain numbers: C3-C7 (gaseous and gasoline) range, C8-C12 (kerosene) range and C12+ (diesel) range. Results show three features concerning product distribution: i) the number of products in the C12 + range is rather low, the majority of deoxygenated molecules in this range being aromatics in the case of OAME cracked over catalysts; ii) the C3-C7 range is more important in the case of ZSM-5 zeolites than in the case of Y zeolites. It can be noted that with both Na-ZSM-5 and H-ZSM-5, significant amount of propene is formed. This property has also been observed when cracking petroleum feedstock in the FCC process using ZSM-5 in the catalyst formulation [ 41 ]. These results confirm that ZSM-5, during its cracking activity, has a higher capacity to promote the formation of small unsaturated molecules than Y zeolite; iii) with both ZSM-5 and Y zeolites, the presence of sodium induces a decrease in the formation of light products. This result also confirm that protonated zeolites promote the cracking reactions of oleic acid methyl ester towards light compounds. The cracking of OAME over HZSM-5, NaY and HY led to the production of a large number of molecules in the range C8-C12 (kerosene range), the best catalyst being NaY. As aviation transport needs to strongly decrease its carbon emissions, with a possibility of zero net carbon emission by 2050 [ 42 ] the necessity to increase the production of green kerosene is mandatory. Then, the present work indicates that one possible way to increase the production of this fuel fraction can be through the addition of some residue biodiesel to the FCC cracking cuts. Other oxygenated molecules such as bio-oil and more probably fatty acids and triglycerides, due their molecular structure close to that of OAME can probably play an additional role in this increasing market. 4. Conclusions Catalytic cracking of oleic acid methyl ester (OAME), used as a model molecule of spoiled biodiesel waste, was performed in the presence of ZSM-5 and Y zeolites, both in their acidic and sodium forms. The cracking of pure OAME, without catalyst, under conditions close to that of the FCC process produced mainly linear mono and poly alkenes. The cracking of OAME over HZSM-5 and HY zeolites promoted a high production of aromatics. Ramified saturated hydrocarbons distribution was remarkable when OAME cracking was performed over NaY and HY zeolites, indicating a promotion of alkylation reactions when compared to ZSM-5 with smaller pores. These results suggest that both shape selectivity and acidity, linked to hydrogen transfer play a role in the product distribution. NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). These results may be of great interest to the market for renewable jet fuel since the aviation industry is committed to reduce CO 2 emissions significantly in the coming years. Declarations Acknowledgments and Funding We gratefully acknowledge financial support from FINEP, RECAT, National Council for Scientific and Technological Development, CNPq/Universal project 430921/2016-0, CNPq/INCT-EMA, PETROBRAS-ANP-LITPEG contract 0050.0078506.12.9, BNB/FUNDECI project 059/2005, FACEPE, CAPES/PNPD and FAPESB. English revision by Sidney Pratt, Canadian, BA, MAT (The Johns Hopkins University), RSAdip (TEFL) (Cambridge University). References Atelge, M.R., Krisa, D., Kumar, G., Eskicioglu, C., Nguyen, D.D., Chang, S.W., Atabani, A.E., Al-Muhtaseb, A.H., Unalan, S.: Biogas production from organic waste: recent progress and perspectives. Waste Biomass Valor. 11 , 1019–1040 (2020). https://doi.org/10.1007/s12649-018-00546-0 Ahmad, S., Kothari, R., Pathak, V.V., Pandey, M.K.: Fuel quality index: a novel experimental evaluation tool for biodiesel prepared from waste cooking oil. Waste Biomass Valori. 10 , 2237–2247 (2019). https://doi.org/10.1007/s12649-018-0250-9 Silva, R.J.M.C.L., Tschoeke, I.C.P., Melo, J.C., Silva, J.P., Pacheco, J.G.A., Silva, J.M.F., Souza, T.P.C.: Comparison between experimental and simulated results of biodiesel production by reactive distillation and energetic assessment. Braz. J. Chem. Eng. 36 , 351–359 (2019). https://doi.org/10.1590/0104-6632.20190361s20170266 Narayanasamy, B., Jeyakumar, N., Balasubramanian, D.: Effect of Star Anise as a Natural Antioxidant Additive on the Oxidation Stability of Lemon Grass Oil. Waste Biomass Valor. (2020). https://doi.org/10.1007/s12649-020-01218-8 Singh, M., Singh, D.K., Gandhi, S.K., Sarin, A., Saini, S., Mahla, S.K., Gupta, A., Sandhu, S.S.: Effect of metal contaminants and antioxidants on the oxidation stability of argemone mexicana biodiesel: Experimental and statistical study. Waste Biomass Valor. 11 , 6189–6198 (2020). https://doi.org/10.1007/s12649-019-00886-5 Xiao, M., Lin, D., Li, Z., Zhao, J., Long, X., Wu, Z.: Synthesis of Biodiesel from Waste Cooking Oil by One-step Esterification and Its Structural Characterization. Waste Biomass Valor. 11 , 2087–2100 (2020). https://doi.org/10.1007/s12649-018-0500-x Souza, T.P.C., Silva, R.J.M.C.L., Melo, J.C., Tschoeke, I.C.P., Silva, J.P., Pacheco, J.G.A., Silva, J.M.F.: Kinetic modeling of cottonseed oil transesterification with ethanol. React. Kinet. Mech. Catal. 128 , 707–722 (2019). https://doi.org/10.1007/s11144-019-01661-2 Cardoso, C.C., Cavalcanti, A.S., Silva, R.O., Junior, S.A., de Sousa, F.P., Pasa, V.M.D., Arias, S., Pacheco, J.G.A.: Residue-Based CaO Heterogeneous Catalysts from Crab and Mollusk Shells for FAME Production Via Transesterification. J. Braz. Chem. Soc. 31 , 756–767 (2020). https://doi.org/10.21577/0103-5053.20190240 Fattah, I.M.R., Masjuki, H.H., Kalam, M.A., Mofijur, M., Abedin, M.J.: Effect of antioxidant on the performance and emission characteristics of a diesel engine fueled with palm biodiesel blends. Energ. Convers. Manage. 79 , 265–272 (2014). https://doi.org/10.1016/j.enconman.2013.12.024 Luo, Y., Ahmed, I., Kubátová, A., Šťávová, J., Aulich, T., Sadrameli, S.M., Seames, W.S.: The thermal cracking of soybean/canola oils and their methyl esters. Fuel Process. Technol. 91 , 613–617: (2010). https://doi.org/10.1016/j.fuproc.2010.01.007 Seames, W., Luo, Y., Ahmed, I., Aulich, T., Kubatova, A., Št'ávová, J., Kozliak, E.: The thermal cracking of canola and soybean methyl esters: improvement of cold flow properties. Biomass Bionerg. 34 , 939–946 (2010). https://doi.org/10.1016/j.biombioe.2010.02.001 Han, J., Sun, H., Ding, Y., Lou, H., Zheng, X.: Palladium-catalyzed decarboxylation of higher aliphatic esters: Towards a new protocol to the second generation biodiesel production. Green Chem. 12 , 463–467 (2010). https://doi.org/10.1039/B917690J Dhillon, G.S., Vasudevan, P.T.: Deoxygenation of methyl oleate and commercial biodiesel over W and Ni-W Catalysts. Waste Biomass Valor. (2020). https://doi.org/10.1007/s12649-020-01146-7 Bezergianni, S., Dimitriadis, A., Kikhtyanin, O., Kubička, D.: Refinery co-processing of renewable feeds. Prog. Energy Combust. Sci. 68 , 29–64 (2018). https://doi.org/10.1016/j.pecs.2018.04.002 Danuthai, T., Jongpatiwut, S., Rirksomboon, T., Osuwan, S., Resasco, D.E.: Conversion of methylesters to hydrocarbons over an H-ZSM5 zeolite catalyst. Appl. Catal., A. 361 , 99–105 (2009). https://doi.org/10.1016/j.apcata.2009.04.001 Bayat, A., Sadrameli, S.M.: Conversion of canola oil and canola oil methyl ester (CME) to green aromatics over a HZSM-5 catalyst: a comparative study. RSC Adv. 5 , 28360–28368 (2015). https://doi.org/10.1039/C5RA01691F Chiappero, M., Do, P.T.M., Crossley, S., Lobban, L.L., Resasco, D.E.: Direct conversion of triglycerides to olefins and paraffins over noble metal supported catalysts. Fuel. 90 , 1155–1165 (2011). https://doi.org/10.1016/j.fuel.2010.10.025 Sancheti, S.V., Yadav, G.D., Ghosh, P.K.: Synthesis and Application of Novel NiMoK/TS-1 for Selective Conversion of Fatty Acid Methyl Esters/Triglycerides to Olefins. ACS Omega. 5 , 5061–5071 (2020). https://doi.org/10.1021/acsomega.9b03993 Pinho, A.R., de Almeida, M.B.B., Mendes, F.L., Ximenes, V.L., Casavechia, L.C.: Co-processing raw bio-oil and gasoil in an FCC unit. Fuel Process. Technol. 131 , 159–166: (2015). https://doi.org/10.1016/j.fuproc.2014.11.008 Lappas, A.A., Bezergianni, S., Vasalos, I.A.: Production of biofuels via co-processing in conventional refining processes. Catal. Today. 145 , 55–62 (2009). https://doi.org/10.1016/j.cattod.2008.07.001 Büchele, M., Swoboda, M., Reichhold, A., Hofer, W.: Canola oil/glycerol mixtures in a continously operated FCC pilot plant and comparison with vacuum gas oil/glycerol mixtures. Chem. Eng. Process. 142 , 107553 (2019). https://doi.org/10.1016/j.cep.2019.107553 Dupain, X., Costa, D.J., Schaverien, C.J., Makkee, M., Moulijn, J.A.: Cracking of a rapeseed vegetable oil under realistic FCC conditions. Appl. Catal. B. 72 , 44–61 (2007). https://doi.org/10.1016/j.apcatb.2006.10.005 Melero, J.A., Clavero, M.M., Calleja, G., García, A., Miravalles, R., Galindo, T.: Production of biofuels via the catalytic cracking of mixtures of crude vegetable oils and nonedible animal fats with vacuum gas oil. Energy Fuels. 24 , 707–717 (2010). https://doi.org/10.1021/ef900914e Fréty, R., Santos, M.R., Padilha, J.F., Azevedo, A.F., Brandão, S.T., Pontes, L.A., Pacheco, J.G.A.: Flash pyrolysis of model compounds adsorbed on catalyst surface: A method for screening catalysts for cracking of fatty molecules. J. Anal. Appl. Pyrolysis. 109 , 56–64 (2014). https://doi.org/10.1016/j.jaap.2014.07.013 Fréty, R., Santos, M.R., Sales, R.F., Silva, A.O.S., Barbosa, C.B.M., Pacheco, J.G.A.: Flash pyrolysis of oleic acid as a model compound adsorbed on supported nickel catalysts for biofuel production. J. Braz. Chem. Soc. 25 , 2433–2443 (2014). https://doi.org/10.5935/0103-5053.20140270 Santos, M.R., Sales, R.F., Silva, A.O.S., Teixeira, C.M., Pacheco, J.G.A., Fréty, R.: Flash pyrolysis of myristic acid adsorbed on supported nickel catalysts for biofuel production. J. Therm. Anal. Calorim. 119 , 1875–1885 (2015). https://doi.org/10.1007/s10973-014-4375-1 Gary, J.H., Handwerk, G.E., Kaiser, M.J.: Petroleum refining: technology and economics. CRC Press, Boca Raton (2007) Santos, M.R., Arias, S., Padilha, J.F., Carneiro, M.C.N., Sales, E.A., Pacheco, J.G.A., Fréty, R.: Catalytic cracking of palmitic and oleic acids pre-adsorbed on γ-alumina. Catal. Today. 344 , 234–239 (2020). https://doi.org/10.1016/j.cattod.2019.04.005 Omidghane, M., Bartoli, M., Asomaning, J., Xia, L., Chae, M., Bressler, D.C.: Pyrolysis of fatty acids derived from hydrolysis of brown grease with biosolids. Environ. Sci. Pollut. Res. 27 , 26395–26405 (2020). https://doi.org/10.1007/s11356-020-09041-3 Maher, M.K., Kirkwood, K.M., Gray, M.R., Bressler, D.C.: Pyrolytic decarboxylation and cracking of stearic acid. Ind. Eng. Chem. Res. 47 , 5328–5336 (2008). https://doi.org/10.1021/ie0714551 Lappi, H., Alén, R.: Production of vegetable oil-based biofuels-Thermochemical behavior of fatty acid sodium salts during pyrolysis. J. Anal. Appl. Pyrolysis. 86 , 274–280 (2009). https://doi.org/10.1016/j.jaap.2009.07.005 Asomaning, J., Mussone, P., Bressler, D.C.: Thermal deoxygenation and pyrolysis of oleic acid. J. Anal. Appl. Pyrolysis. 105 , 1–7 (2014). https://doi.org/10.1016/j.jaap.2013.09.005 Arias, S., González, J.F., Sousa, L.V., Barbosa, C.B.M., Silva, A.O.S., Fréty, R., Pacheco, J.G.A.: Influence of Ni/Al ratio on the fast pyrolysis of myristic acid when adsorbed on unsupported mixed oxides derived from layered double hydroxides. Catal. Today (2020). https://doi.org/10.1016/j.cattod.2020.07.028 Mante, O.D., Agblevor, F.A., Oyama, S.T., McClung, R.: Catalytic pyrolysis with ZSM-5 based additive as co-catalyst to Y-zeolite in two reactor configurations. Fuel. 117 , 649–659 (2014). https://doi.org/10.1016/j.fuel.2013.09.034 Kotrel, S., Rosynek, M.P., Lunsford, J.H.: Quantification of acid sites in H-ZSM-5, H-β, and HY zeolites. J. Catal. 182 , 278–281 (1999). https://doi.org/10.1006/jcat.1998.2339 Denayer, J.F., Souverijns, W., Jacobs, P.A., Martens, J.A., Baron, G.V.: High-temperature low-pressure adsorption of branched C 5 -C 8 alkanes on zeolite Beta, ZSM-5, ZSM-22, zeolite Y, and mordenite. J. Phys. Chem. B. 102 , 4588–4597 (1998). https://doi.org/10.1021/jp980674k Mihalcik, D.J., Mullen, C.A., Boateng, A.A.: Screening acidic zeolites for catalytic fast pyrolysis of biomass and its components. J. Anal. Appl. Pyrolysis. 92 , 224–232 (2011). https://doi.org/10.1016/j.jaap.2011.06.001 Kubátová, A., Št’ávová, J., Seames, W.S., Luo, Y., Sadrameli, S.M., Linnen, M.J., Baglayeva, G.V., Smoliakova, I.P., Kozliak, E.I.: Triacylglyceride thermal cracking: Pathways to cyclic hydrocarbons. Energy Fuels. 26 , 672–685 (2012). https://doi.org/10.1021/ef200953d Guisnet, M., Magnoux, P.: Organic chemistry of coke formation. Appl. Catal. A. 212 , 83– 96 (2001). https://doi.org/10.1016/S0926-860X(00)00845-0 Teixeira, C.M., Frety, R., Barbosa, C.B.M., Santos, M.R., Bruce, E.D., Pacheco, J.G.A.: Mo influence on the kinetics of jatropha oil cracking over Mo/HZSM-5 catalysts. Catal. Today. 279 , 202–208 (2017). https://doi.org/10.1016/j.cattod.2016.06.006 Buchanan, J.S.: The chemistry of olefins production by ZSM-5 addition to catalytic cracking units. Catal. Today. 55 , 207–212 (2000). https://doi.org/10.1016/S0920-5861(99)00248-5 Schmidt, P., Batteiger, V., Roth, A., Weindorf, W., Raksha, T.: Power-to‐liquids as renewable fuel option for aviation: A review. Chem. Ing. Tech. 90 , 127–140 (2018). https://doi.org/10.1002/cite.201700129 Supplementary Files 1OAMECrackingGraphicalAbstract.tif Cite Share Download PDF Status: Published Journal Publication published 27 Jun, 2021 Read the published version in Waste and Biomass Valorization → Version 1 posted Reviewers invited by journal 08 Mar, 2021 Reviews received at journal 08 Mar, 2021 Editor invited by journal 03 Mar, 2021 Editor assigned by journal 11 Feb, 2021 First submitted to journal 08 Feb, 2021 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-224425","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":15847462,"identity":"03f7a71b-1673-40fb-b864-2b842ec459a2","order_by":0,"name":"Jose Fernando Padilha","email":"","orcid":"","institution":"Universidade Federal da Bahia","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Jose","middleName":"Fernando","lastName":"Padilha","suffix":""},{"id":15847463,"identity":"cd036c87-f105-471f-b9a6-bebc96550e6d","order_by":1,"name":"Roger Frety","email":"","orcid":"https://orcid.org/0000-0002-4532-2105","institution":"Universidade Federal da Bahia","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Roger","middleName":"","lastName":"Frety","suffix":""},{"id":15847464,"identity":"97c47ac2-96a3-43ad-9429-16267e4d697b","order_by":2,"name":"Alane P. Santos","email":"","orcid":"","institution":"Universidade Federal da Bahia","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Alane","middleName":"P.","lastName":"Santos","suffix":""},{"id":15847465,"identity":"2e6ea577-e13f-49dd-92e4-4a27e80b7847","order_by":3,"name":"Luiz A. M. Pontes","email":"","orcid":"","institution":"Universidade Federal da Bahia","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Luiz","middleName":"A. M.","lastName":"Pontes","suffix":""},{"id":15847466,"identity":"48c0dcb9-91cb-4563-b254-bab9b7140543","order_by":4,"name":"Marilia Ramalho Santos","email":"","orcid":"","institution":"Universidade Federal de Pernambuco","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Marilia","middleName":"Ramalho","lastName":"Santos","suffix":""},{"id":15847467,"identity":"12cd08d9-4812-4a14-8f90-cbafb0822b6a","order_by":5,"name":"Santiago Arias","email":"","orcid":"","institution":"Universidade Federal de Pernambuco","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Santiago","middleName":"","lastName":"Arias","suffix":""},{"id":15847468,"identity":"697e4f6a-142b-4636-9b01-90be8d5e61f2","order_by":6,"name":"Jose Geraldo Andrade Pacheco","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA7ElEQVRIiWNgGAWjYBACxgYowwBEfGCQA5I8JGhhnMFgTFgLHIC0MPMQo4W5vf3hA8YddvLm7M0PH9u2GeTxM/Ae+4DXYT1njA0YzyQb7uw5Zmyc22ZQLNnAlzwDr5YZOWwSjG3MCQY3ctikc9v+JG44wGOM12GMM9Kf/2Bsq08wuP+GTdqyzSBxP2EtCWYMjG2HgbbwsEkzArVsYCCkBegXicQzxw03nEkzNuw5Z1AscZgvGa8WQ2CIffi4o1re4Pjhhw9+lAFDrL33MH4tDUAisQEhkMDAjFcDA4M82HUoWkbBKBgFo2AUoAEATkhGazDA2HsAAAAASUVORK5CYII=","orcid":"https://orcid.org/0000-0002-8812-5021","institution":"Universidade Federal de Pernambuco","correspondingAuthor":true,"submittingAuthor":false,"prefix":"","firstName":"Jose","middleName":"Geraldo Andrade","lastName":"Pacheco","suffix":""}],"badges":[],"createdAt":"2021-02-08 20:52:47","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-224425/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-224425/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1007/s12649-021-01505-y","type":"published","date":"2021-06-27T10:29:44+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":6854430,"identity":"98be17b6-b4a7-4427-b41a-56172c0d1366","added_by":"auto","created_at":"2021-03-11 19:43:53","extension":"png","order_by":1,"title":"Figure 1","display":"","copyAsset":false,"role":"figure","size":87277,"visible":true,"origin":"","legend":"Pyrograms obtained after cracking of oleic acid methyl ester at 650 °C, pure and in the presence of catalysts. Main compounds in pyrograms: (0) oleic acid methyl ester (OAME), (1) propene, (2) butene, (3) pentene, (4) hexene, (5) benzene, (6) 4-methyl-2-hexene, (7) toluene, (8) ethylbenzene, (9) o-xylene, (10) m-xylene, (11) propylbenzene, (12) 1-ethyl-2-methylbenzene, (13) 1,2,3-trimethylbenzene, (14) heptanoic acid methyl ester, (15) 1-ethyl-3-methylbenzene, (16) indane, (17) 1,2-diethylbenzene, (18) 1-ethyl-3,5 dimethylbenzene, (19) nonanal, (20) 1,2,3,4-tetramethylbenzene, (21) naphthalene, (22) decanal, (23) 1-ethyl-2,4,5-trimethylbenzene, (24) 1-methylnaphthalene, (25) 2-methylnaphthalene, (26) 1,5-dimethylnaphthalene, (27) 1,3-dimethylnaphthalene, (28) dodecanoic acid methyl ester, (29) tetradecanoic acid methyl ester, (30) pentadecanoic acid methyl ester, (31) 9-methyltetradecanoic acid methyl ester, (32) 9-hexadecenoic acid methyl ester, (33) hexadecanoic acid methyl ester, (34) heptadecanoic acid methyl ester, (35) 11-eicosenoic acid methyl ester.","description":"","filename":"Fig1.png","url":"https://assets-eu.researchsquare.com/files/rs-224425/v1/0242546aee92b9074987ff02.png"},{"id":6853877,"identity":"c207ed2a-2074-4c23-b1b9-60bb25336df3","added_by":"auto","created_at":"2021-03-11 19:37:53","extension":"png","order_by":2,"title":"Figure 2","display":"","copyAsset":false,"role":"figure","size":19451,"visible":true,"origin":"","legend":"Distribution of deoxygenated products according to carbon number in the C3-C7 (gaseous and gasoline) range, C8-C12 (kerosene) range and C12+ (diesel) range after cracking at 650 °C of oleic acid methyl ester (OAME), pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts.","description":"","filename":"Fig2.png","url":"https://assets-eu.researchsquare.com/files/rs-224425/v1/caa874b3ec18be56da05f845.png"},{"id":17278599,"identity":"1ae47d6d-c232-4813-b52e-c2855266ae90","added_by":"auto","created_at":"2022-01-13 10:29:47","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":433180,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-224425/v1/bfc53645-a5b3-46dc-9a18-8cbafe48b2aa.pdf"},{"id":6854317,"identity":"7a3f479e-3bf2-4458-b3dd-0d081303855a","added_by":"auto","created_at":"2021-03-11 19:40:53","extension":"tif","order_by":1,"title":"","display":"","copyAsset":false,"role":"supplement","size":351642,"visible":true,"origin":"","legend":"","description":"","filename":"1OAMECrackingGraphicalAbstract.tif","url":"https://assets-eu.researchsquare.com/files/rs-224425/v1/f6356657eb88e00ebf1310b0.tif"}],"financialInterests":"","formattedTitle":"Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites","fulltext":[{"header":"Statement of Novelty","content":"\u003cp\u003eThis work shows that oleic acid methyl ester as a model of residues from off-spec biodiesel and waste from biodiesel tank bottom drainage can be directly co-processed in a FCC unit, using ZSM-5 and Y zeolites as catalysts in H- and Na-form. The use of such residues in FCC process can promote the production o high value hydrocarbons, mainly in the jet fuel and gasoline ranges. These results may be of great interest to the growing market for renewable jet fuel since the aviation industry is committed to reduce CO2 emissions towards zero net carbon emissions. To the best of our knowledge, such a systematic study has not been reported yet.\u003c/p\u003e\n"},{"header":"1. Introduction","content":" \u003cp\u003eThe emission of greenhouse gases from the high consumption of fossil fuels has recently been the cause of the hottest years and extreme weather events [\u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e]. The use of biofuels has increased significantly to attain a sustainable economy and independence from fossil sources. The use of biodiesel as a diesel additive requires a rigorous quality control of this biofuel [\u003cspan citationid=\"CR2\" class=\"CitationRef\"\u003e2\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e]. Biodiesel is subjected to chemical modification due to the double bonds of the methyl esters with one, two or three C\u0026thinsp;=\u0026thinsp;C which can be easily oxidized. The chemical modifications of the biodiesel can be due to storage conditions such as exposure to air, humidity, light and temperature or to the presence of metals that have a catalytic activity for oxidation or polymerization reactions. The oxidized products are organic acids, hydroperoxides and aldehydes that cause corrosion problems to engine [\u003cspan citationid=\"CR4\" class=\"CitationRef\"\u003e4\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e].\u003c/p\u003e \u003cp\u003ePolymerization reactions can produce gums, generating solid deposits in pumps and filters leading to engine operation problems. These products as well as microbial growth affect the quality properties of the biodiesel [\u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e]. Finally, a limited quality biodiesel can appear when problems in the production process lead to the formation of an off-spec product with excess impurities such as soaps, glycerol or catalyst [\u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e]. Another concern is the addition of an antioxidant to avoid the degradation of biodiesel. Antioxidants may affect the clean-burning characteristic of biodiesel. The addition of up to 1000 ppm of different kinds of commercial antioxidants led to the increase of hydrocarbons and CO emissions when blends of 20 vol% of biodiesel in diesel are burned in a diesel engine [\u003cspan citationid=\"CR9\" class=\"CitationRef\"\u003e9\u003c/span\u003e]. Then, off-spec biodiesel and waste from biodiesel tank bottom drainage become a feedstock candidate for deoxygenated biofuels production.\u003c/p\u003e \u003cp\u003eThe thermal cracking of methyl esters of canola and soybean oils, at 440\u0026deg;C, was studied by Luo et al [\u003cspan citationid=\"CR10\" class=\"CitationRef\"\u003e10\u003c/span\u003e] in a Parr type reactor, under autogenous pressure or hydrogen. Whereas the vegetable oil transformations produced as cracked products some fatty acids, alkanes and alkenes, the esters transformation produced small chain esters, alkanes and alkenes, without large differences between the various yields. These authors also showed that soybean oil and esters produced lighter products, due to a higher unsaturation of the carbon chain fatty acids, increasing the number of C-C bonds able to crack. Seames et al [\u003cspan citationid=\"CR11\" class=\"CitationRef\"\u003e11\u003c/span\u003e], of the same research group, studied the thermal conversion of long chain esters and suggested that cracking is an excellent way to obtain esters with a smaller carbon chain, resulting in better physical properties for potential kerosene type fuel. They needed, however, a distillation step at 300\u0026deg;C, to decrease the residual oxygen content of the whole bio-oil obtained.\u003c/p\u003e \u003cp\u003eHydrodeoxygenation (HDO) of methyl esters was also reported in the presence of supported metal catalyst. Han et al. [\u003cspan citationid=\"CR12\" class=\"CitationRef\"\u003e12\u003c/span\u003e] studied the HDO of methyl stearate diluted in hexane at 270\u0026deg;C, under 16 bar H\u003csub\u003e2\u003c/sub\u003e over 5%Pd/BaSO\u003csub\u003e4\u003c/sub\u003e, obtaining 99% conversion and 97% heptadecanoate selectivity that corresponds to diesel range. Dhillon and Vasudevan studied the deoxygenation of methyl oleate and commercial biodiesel over WO3/γ-Al2O3 and Ni- WO3/γ-Al2O3 catalysts [\u003cspan citationid=\"CR13\" class=\"CitationRef\"\u003e13\u003c/span\u003e]. According to Bezergianni et al. [\u003cspan citationid=\"CR14\" class=\"CitationRef\"\u003e14\u003c/span\u003e], the NiMo catalyst favors complete hydrodeoxygenation of glycerol tristearate producing C18 and C3 alkanes\u0026thinsp;+\u0026thinsp;6H\u003csub\u003e2\u003c/sub\u003eO, in a reaction more hydrogen-consuming than hydrodecarboxylation favored by NiW catalyst, producing C17 and C3 alkanes\u0026thinsp;+\u0026thinsp;3CO\u003csub\u003e2\u003c/sub\u003e. However, these HDO processes consume a large amount of hydrogen and require expensive high pressure hydrogen facilities.\u003c/p\u003e \u003cp\u003eDeoxygenation of fatty esters can be performed without hydrogen consumption over acidic and metal catalysts. The deoxygenation of methyl octanoate on acidic H-ZSM5 produced C1-C7 hydrocarbons, with significant amounts of aromatics. Octanoic acid and 8-pentadecanone were formed as primary products from the hydrolysis of methyl octanoate, followed by condensation [\u003cspan citationid=\"CR15\" class=\"CitationRef\"\u003e15\u003c/span\u003e]. Bayat et al. [\u003cspan citationid=\"CR16\" class=\"CitationRef\"\u003e16\u003c/span\u003e] studied the cracking of canola oil methyl ester on HZSM-5 at 375\u0026deg;C, and obtained 75 % of liquid products containing 57 % of aromatics, mainly xylenes, toluene and C9 aromatics. Chiappero et al. [\u003cspan citationid=\"CR17\" class=\"CitationRef\"\u003e17\u003c/span\u003e] studied the deoxygenation of methyl octanoate over Pt/SiO2 catalyst under helium at 350\u0026deg;C, in a reactive distillation system. They obtained 56 % C7 alkanes and 40 % C7 alkenes. Sancheti [\u003cspan citationid=\"CR18\" class=\"CitationRef\"\u003e18\u003c/span\u003e] studied the deoxygenation of methyl palmitate diluted in n-hexane over a Ni5Mo10K/TS-1 (titanosilicate) catalyst at 380\u0026deg;C, obtaining 29% conversion and selectivity of 87% to C15 alkenes and 8% to C15 alkanes.\u003c/p\u003e \u003cp\u003eTo lower the cost, a deoxygenation process can take place in an existing industrial facility such as the FCC process. FCC is a catalytic process transforming large molecules of petroleum feedstocks to lighter ones, compatible with gasoline, kerosene and diesel fuels. Co-processing of FCC petroleum feedstocks with oxygenated molecules, such as those obtained from biomass processing [\u003cspan citationid=\"CR14\" class=\"CitationRef\"\u003e14\u003c/span\u003e, \u003cspan citationid=\"CR19\" class=\"CitationRef\"\u003e19\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR20\" class=\"CitationRef\"\u003e20\u003c/span\u003e] and triglycerides from vegetable oils [\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e], has been reported. Results showed that up to 10 mass % of oxygenated molecules can be added to petroleum cuts without decreasing the yields of useful products [\u003cspan citationid=\"CR19\" class=\"CitationRef\"\u003e19\u003c/span\u003e]. During the cracking process, FCC catalysts that contain acidic zeolites as active phase are permanently deactivated and regenerated. The addition of controlled amounts of oxygenated molecules during cracking seems ineffective in decreasing the lifetime of the catalysts [\u003cspan citationid=\"CR19\" class=\"CitationRef\"\u003e19\u003c/span\u003e, \u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e]. Therefore, it can be important to further study the cracking of other oxygenated molecules such as fatty acid ester under conditions close to that of FCC process [\u003cspan citationid=\"CR22\" class=\"CitationRef\"\u003e22\u003c/span\u003e].\u003c/p\u003e \u003cp\u003eTo simulate a bench-scale FCC process, a fixed-bed microactivity test (MAT) unit is generally used. However, this type of reactor presents differences in comparison to the industrial process related to (i) the fluid dynamics of the fluidized reactor compared to fixed bed; (ii) the short contact times that in the FCC reactor vary from 2 to 10 s; and (iii) the stripping of the reaction products in the MAT system [\u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e23\u003c/span\u003e]. In a preceding study, some of us [\u003cspan citationid=\"CR24\" class=\"CitationRef\"\u003e24\u003c/span\u003e] suggested that the micropyrolysis of fatty compounds preadsorbed on catalyst surface can be used to screen some catalytic properties, as catalytic micropyrolysis generates a large spectrum of organic products. As the experimental conditions used were close to those used in FCC process, with high heating rates, and a catalyst:feed mass ratio close to 9, such procedure can in part simulate what occurs in a FCC riser. The present work aims at studying deoxygenation of oleic acid methyl ester close to FCC conditions in absence or presence of Y and ZSM-5 zeolites, in both protonated and sodium forms, to investigate the formation of deoxygenated products and their distribution. Y zeolites and ZSM-5 are typical zeolites used in FCC catalysts.\u003c/p\u003e "},{"header":"2. Experimental","content":"\u003cp\u003e\u003cem\u003e2.1.Catalysts\u003c/em\u003e\u003c/p\u003e\n\u003cp\u003eStarting catalysts samples were NH\u003csub\u003e4\u003c/sub\u003eZSM-5 (Si/Al = 15) and NH\u003csub\u003e4\u003c/sub\u003eY (Si/Al = 6) materials from Zeolyst, in powder form. These samples were heat treated at 600 \u0026deg;C under static air to obtain the acid forms HZSM-5 and HY, respectively. These new samples were then exchanged with aqueous solution of sodium nitrate (5 mol L\u003csup\u003e\u0026ndash;1\u003c/sup\u003e) for one hour, washed with deionized water to remove nitrate ions, dried at 110 \u0026deg;C and heat treated under static air at 500 \u0026deg;C for 3 hours. This exchange procedure was repeated three times. Final samples are referred to as NaZSM-5 and NaY.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003e2.2.Mixtures of oleic acid methyl ester and catalyst\u003c/em\u003e\u003c/p\u003e\n\u003cp\u003eOleic acid methyl ester (Sigma Aldrich) was impregnated onto H- and Na-zeolites, after drying at 110 \u0026deg;C, by dropping micro amounts of the pure organic molecule onto powdered zeolites, under constant manual mixing. The mass ratio of catalyst:oleic acid methyl ester was 10:1. At the end of this process, samples were still in their initial powder form. These impregnated samples are thereafter referred to OAME/catalyst, catalyst representing H- or Na-zeolite.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003e2.3.Pyrolysis experiments\u003c/em\u003e\u003c/p\u003e\n\u003cp\u003eCracking experiments have been performed in a micropyrolyzer Pyroprobe 5200 CDS Analytical set up described in previous works [25\u0026ndash;26]. The cracking temperature was fixed at 650 \u0026deg;C for 15 seconds, which is higher than the FCC raiser feed temperature (500 \u0026deg;C) and lower than the temperature of the incoming FCC regenerated hot catalyst (715 \u0026deg;C) [27]. The heating rate of the pyrolysis space, by a platinum coil resistance, was estimated to be 1,000 \u0026deg;C min\u003csup\u003e-1\u003c/sup\u003e. The sample mass of catalyst impregnated with OAME was about 1.5 mg. The sample was placed in a quartz tube, between two quartz wool plugs. The sample was submitted to a helium flow rate of 150 mL min\u003csup\u003e-1\u003c/sup\u003e. Cracked products (up to 400 compounds) and untransformed feed were separated in a GC/MS apparatus Shimadzu QP2010. The GC program started at 45 \u0026deg;C for 5 min, heating ramp of 4 \u0026deg;C min\u003csup\u003e-1\u003c/sup\u003e, and final temperature of 280 \u0026deg;C. Split injector temperature was 250 \u0026deg;C and split ratio was 30:1. GC column was a DB-5MS (30 m x 0.25 mm x 0.2 \u0026micro;m). The temperature of MS interface was 290 \u0026deg;C and that of the ion source was 250 \u0026deg;C. MS operated in scan mode with m/z range of 40-400. Deoxygenated products were identified with the help of the NIST data library with similarity equal to or higher than 90%. A standard mixture of hydrocarbons was used to help identify the products: PIANO Mix from Sigma-Aldrich/Supelco, Bellefonte, PA, USA. Due to a large number of products, the deoxygenated compounds were grouped by summing peak areas of specific molecules or molecule families. To classify the different families of compounds, the products were first separated as unidentified, oxygenated and deoxygenated compounds, i.e. hydrocarbons. Deoxygenated molecules were further separated as alkanes, alkenes, polyenes and aromatic compounds. Among saturated and monounsaturated hydrocarbons, linear, cyclic and ramified molecules were further associated. Separation between single benzene ring and molecules with multiple benzene rings was also considered. Deoxygenated molecules were also associated in three families of hydrocarbons, C3-C7, C8-C12 and C12+ to estimate the type of products able to be added or upgraded to gasoline, kerosene or diesel cuts.\u003c/p\u003e"},{"header":"3. Results And Discussion","content":" \u003cp\u003eIn all cases of oleic acid methyl ester (OAME) cracking, between 20 to 30% of pyrogram total area was due to unidentified and products with similarity identification between 60 and 75%. This value is higher than that of unidentified products estimated when cracking myristic acid and palmitic acid as model molecules [\u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e26\u003c/span\u003e, \u003cspan citationid=\"CR28\" class=\"CitationRef\"\u003e28\u003c/span\u003e]. This fact implies a more complex mechanistic scheme during cracking of unsaturated fatty molecules [\u003cspan citationid=\"CR25\" class=\"CitationRef\"\u003e25\u003c/span\u003e, \u003cspan citationid=\"CR29\" class=\"CitationRef\"\u003e29\u003c/span\u003e] when compared to the scheme retained during cracking of saturated fatty acids which is attributed essentially to decarboxylation and decarbonylation reactions, in agreement with the literature data [\u003cspan additionalcitationids=\"CR31 CR32\" citationid=\"CR30\" class=\"CitationRef\"\u003e30\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR33\" class=\"CitationRef\"\u003e33\u003c/span\u003e]. In the present case, a complete deoxygenation of the oleic acid methyl ester (OAME) was not obtained. But, in their majority, the remaining oxygenated compounds were susceptible to further decomposition when the contact time between catalyst and reactant and/or intermediate products was increased. Therefore, it was expected that the general trends in the product distribution observed in this work would be maintained with a higher degree of decomposition of the feed.\u003c/p\u003e \u003cp\u003e \u003cem\u003e3.1.Cracking of pure oleic acid methyl ester in absence of catalyst\u003c/em\u003e \u003c/p\u003e \u003cp\u003eOleic acid methyl ester C18:1 (OAME) pyrogram after cracking at 650\u0026deg;C in absence of catalyst is presented in Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e. The pyrogram can be divided into two main domains. The left part region, below retention time close to 33 min, where peaks rather well separated of limited size appear; and the right part, above retention time of 33 min, where peaks, poorly separated, of important size are observed. The larger peak in this second region (retention time close to 50 min) is due to untransformed OAME. Product classes reported in Table\u0026nbsp;\u003cspan refid=\"Tab1\" class=\"InternalRef\"\u003e1\u003c/span\u003e show that thermal cracking of OAME at 650\u0026deg;C produced only 4.3% of deoxygenated compounds, essentially associated to peaks below retention time of 33 min. In the right part of the pyrogram, many oxygenated and unidentified products are present. Along all the pyrogram, a large amount of carboxylic acid methyl esters was observed (75.1%), i.e. methyl esters of C2 to C18 saturated and unsaturated carboxylic acids. This result implies that under these conditions, cracking of OAME and methyl esters of lower chain length can occur not only close to the carboxylate position, but also within the hydrocarbon chain, probably in the beta position of the C\u0026thinsp;=\u0026thinsp;C bond. The presence of all chain lengths between the C2 and C19 methyl esters suggests also an important migration of the C\u0026thinsp;=\u0026thinsp;C double bond position before cracking occurs. Although the number of hydrocarbons (HC) observed from pure OAME cracking is low, the HC production is much higher after cracking in presence of catalysts studied.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003e \u003cem\u003e3.2.Cracking of oleic acid methyl ester adsorbed on zeolites\u003c/em\u003e \u003c/p\u003e \u003cp\u003eThe cracking of OAME impregnated on zeolite catalysts at 650\u0026deg;C presented a higher degree of reaction than the cracking of pure OAME. Figure\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e shows together with that of pure OAME, the pyrograms of OAME/HY, OAME/NaY, OAME/HZSM-5 and OAME/NaZSM-5. The cracking of OAME in contact with zeolites presented a higher degree of transformation than the cracking of pure OAME. The quantitative results are shown in Table\u0026nbsp;\u003cspan refid=\"Tab1\" class=\"InternalRef\"\u003e1\u003c/span\u003e. The area % of hydrocarbons varies from 24 to almost 40% in presence of catalysts while this value is only 4.3% for the cracking of OAME in absence of catalysts. Simultaneously, the number of oxygenated compounds decreased in the catalytic cracking. Therefore, both acidic and sodium zeolite catalysts helped the deoxygenation of OAME, in the same way they favored deoxygenated products as reported in the case of fatty acids cracking [\u003cspan citationid=\"CR24\" class=\"CitationRef\"\u003e24\u003c/span\u003e]. The number of produced hydrocarbons over HY and NaY was practically the same. However, the number of hydrocarbons over HZSM-5 was much higher than over NaZSM-5, suggesting that the acid sites in HZSM-5 are more effective in producing the deoxygenation reactions. In all cases, the number of unidentified compounds is higher when cracking is performed in presence of catalyst, suggesting more complex reaction schemes.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab1\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 1\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003eProduct family distribution after cracking of oleic acid methyl ester (OAME) at 650\u0026deg;C, pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"4\"\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCatalyst\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eUnidentified\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eOxygenated\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003eHydrocarbons\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003ePure OAME\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e11.2\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e84.5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e4.3\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e18.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e57.4\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e24.5\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e19.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e41.9\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e39.0\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e36.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e26.4\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e37.5\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e15.7\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e45.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e39.2\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eTable\u0026nbsp;\u003cspan refid=\"Tab2\" class=\"InternalRef\"\u003e2\u003c/span\u003e summarizes a first association of hydrocarbon families obtained after cracking of OAME. In the case of pure OAME, cracking produced mainly linear alkenes, the majority of them being 1-alkenes. These alkenes are an important class of products in the cracking of saturated fatty acids, as the main decomposition mechanism is due to simple decarbonylation [\u003cspan citationid=\"CR28\" class=\"CitationRef\"\u003e28\u003c/span\u003e, \u003cspan citationid=\"CR33\" class=\"CitationRef\"\u003e33\u003c/span\u003e]. The second class of important products has been observed to be polyunsaturated molecules, including dienes, trienes and alkynes. In the presence of all catalysts, the cracking of OAME produced a high number of aromatics. Protonated catalysts HZSM-5 and HY were more effective for aromatization than sodium catalysts NaZSM-5 and NaY, respectively. The second most important hydrocarbon family was that of alkenes in the case of NaZSM-5, HZSM-5 and NaY. In the case of HY, the second most important group was that of alkanes.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab2\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 2\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003eHydrocarbon family distribution after cracking at 650\u0026deg;C of oleic acid methyl ester (OAME), pure and in the presence of NaZSM-5, HZSM-5, NaY and HY catalysts.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"5\"\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCatalyst\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eAlkanes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eAlkenes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003ePolyenes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c5\"\u003e \u003cp\u003eAromatics\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e2.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e1.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e0.1\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e10.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e14.0\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e2.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e13.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e1.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e22.2\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e7.8\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e11. 8\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e0.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e16.8\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e12.7\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e3.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e2.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e20.0\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eTable\u0026nbsp;\u003cspan refid=\"Tab3\" class=\"InternalRef\"\u003e3\u003c/span\u003e details the distribution of saturated and unsaturated products. Whereas more linear alkanes appear in the case of OAME cracking over HZSM-5, the presence of ramified alkanes is remarkable when OAME cracking was performed over both NaY and HY zeolites. In the case of alkenes, whereas more linear alkenes appear with OAME/NaZSM-5 and OAME/HZSM-5, ramified alkenes show the highest content in the cracking with OAME/NaY, OAME/HZSM-5 and OAME/HY. Therefore, in a systematic way, Y type zeolite presents a more important alkylation property than ZSM-5 type zeolite, probably due to acid sites of stronger strength or in greater numbers [\u003cspan citationid=\"CR34\" class=\"CitationRef\"\u003e34\u003c/span\u003e]. In fact, although acidity measurements were difficult to obtain under the present experimental conditions, an estimation based on Si/Al ratio [\u003cspan citationid=\"CR35\" class=\"CitationRef\"\u003e35\u003c/span\u003e] suggests that the number of acid sites is probably two times more important with HY (with Si/Al\u0026thinsp;=\u0026thinsp;6) than with HZSM-5 (with Si/Al\u0026thinsp;=\u0026thinsp;15). The higher the Al content, the higher the acidity. Another explanation is the occurrence of shape selectivity. The pore size of the Y zeolite (7.4 Ǻ) is larger than that of ZSM-5 (5.1\u0026ndash;5.6 Ǻ) zeolite, enabling alkylation reactions which require more space inside the porous structure [\u003cspan citationid=\"CR36\" class=\"CitationRef\"\u003e36\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR37\" class=\"CitationRef\"\u003e37\u003c/span\u003e]. It is also important to recall that 1-alkenes represent more than 50% of all alkenes in the case of thermal cracking of pure OAME and cracking in presence of NaZSM-5. On the contrary, in the other cases, small amounts of 1-alkenes are identified, when present. All three HZSM-5, Na/Y and HY catalysts favor the formation of cyclic and internal linear alkenes, eventually alkylated. These three zeolites show therefore a high capacity of isomerization, probably due to higher number of acidic sites existing on their surface. In the case of Y-based catalysts, the larger pore size compared to that of HZSM-5 may also favor molecules with higher kinetic diameter, i.e. ramified ones, as commented above.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab3\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 3\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003eDistribution of alkane and alkene hydrocarbon families into linear, cyclic and ramified classes, after cracking at 650\u0026deg;C of oleic acid methyl ester (OAME), pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"7\"\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCatalyst\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eLinear Alkanes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003eCyclo-Alkanes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c4\"\u003e \u003cp\u003eRamified Alkanes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c5\"\u003e \u003cp\u003eLinear Alkenes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c6\"\u003e \u003cp\u003eCyclo-Alkenes\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c7\"\u003e \u003cp\u003eRamified Alkenes\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.2\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e0.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e0.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e1.8\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e \u003cp\u003e0.5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e \u003cp\u003e0.4\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e7.4\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e \u003cp\u003e1.5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e \u003cp\u003e2.6\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e1.8\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e0.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e0.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e5.7\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e \u003cp\u003e2.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e \u003cp\u003e7.0\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e2.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e7.2\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e2.1\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e \u003cp\u003e1.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e \u003cp\u003e9.6\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.4\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e1.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e \u003cp\u003e12.2\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e \u003cp\u003e0.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e \u003cp\u003e0.9\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c7\"\u003e \u003cp\u003e3.3\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eTable\u0026nbsp;\u003cspan refid=\"Tab4\" class=\"InternalRef\"\u003e4\u003c/span\u003e presents the distribution of aromatic compounds. The formation of aromatics was not significant in the case of thermal cracking of OAME. On the contrary, as said above, the formation of aromatic molecules is very impressive when OAME is cracked over zeolite samples. HY and HZSM-5 zeolites showed a higher aromatization capacity than the sodium exchanged ones.\u003c/p\u003e \u003cp\u003eWhereas a high number of molecules containing a single benzene ring are present with OAME/NaZSM-5 and OAME/HZSM-5, molecules containing more than one benzene ring are identified in a significant way during the cracking of OAME adsorbed on Y type zeolites. In the case of OAME/HY, polyaromatic compounds with 3 benzene rings were detected, suggesting an important possibility of coking of this catalyst during cracking of OAME. The formation of mono aromatic hydrocarbons may be associated with the dehydrogenation of six carbon numbered cyclic alkanes and alkenes [\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e, \u003cspan citationid=\"CR38\" class=\"CitationRef\"\u003e38\u003c/span\u003e]. Polyaromatic hydrocarbons, on the other hand, are formed through the polymerization and dehydrogenation of mono alkyl aromatics [\u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e23\u003c/span\u003e] and alternatively through an intramolecular radical cyclization mechanism [\u003cspan citationid=\"CR38\" class=\"CitationRef\"\u003e38\u003c/span\u003e]. It is known that polyaromatics are generally considered as potential precursors of coke [\u003cspan citationid=\"CR39\" class=\"CitationRef\"\u003e39\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR40\" class=\"CitationRef\"\u003e40\u003c/span\u003e]. This behavior, together with the hydrogenation properties shown by Y type zeolite must be linked to strong acidic properties of Y zeolite and to hydrogen transfer phenomena, leading on one hand to rather large number of saturated hydrocarbons, and on the other hand to strongly dehydrogenated polyaromatic molecules.\u003c/p\u003e \u003cp\u003e \u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"Yes\" id=\"Tab4\" border=\"1\"\u003e \u003ccaption language=\"En\"\u003e \u003cdiv class=\"CaptionNumber\"\u003eTable 4\u003c/div\u003e \u003cdiv class=\"CaptionContent\"\u003e \u003cp\u003eDistribution of monoaromatic and polyaromatic product families after cracking at 650\u0026deg;C of oleic acid methyl ester (OAME), pure and in presence of NaZSM-5, HZSM-5, NaY and HY catalysts.\u003c/p\u003e \u003c/div\u003e \u003c/caption\u003e \u003ccolgroup cols=\"3\"\u003e \u003cthead\u003e \u003ctr\u003e \u003cth align=\"left\" colname=\"c1\"\u003e \u003cp\u003eCatalyst\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c2\"\u003e \u003cp\u003eMonoaromatics\u003c/p\u003e \u003c/th\u003e \u003cth align=\"left\" colname=\"c3\"\u003e \u003cp\u003ePolyaromatics\u003c/p\u003e \u003c/th\u003e \u003c/tr\u003e \u003c/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e0.0\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e0.1\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e13.6\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e0.4\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HZSM-5\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e17.4\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e4.8\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/NaY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e9.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e7.5\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003ctr\u003e \u003ctd align=\"left\" colname=\"c1\"\u003e \u003cp\u003eOAME/HY\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e \u003cp\u003e12.3\u003c/p\u003e \u003c/td\u003e \u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e \u003cp\u003e7.7\u003c/p\u003e \u003c/td\u003e \u003c/tr\u003e \u003c/tbody\u003e \u003c/colgroup\u003e \u003c/table\u003e\u003c/div\u003e \u003c/p\u003e \u003cp\u003eFigure\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e summarizes the quantities of hydrocarbons associated to the carbon chain numbers: C3-C7 (gaseous and gasoline) range, C8-C12 (kerosene) range and C12+ (diesel) range. Results show three features concerning product distribution: i) the number of products in the C12\u0026thinsp;+\u0026thinsp;range is rather low, the majority of deoxygenated molecules in this range being aromatics in the case of OAME cracked over catalysts; ii) the C3-C7 range is more important in the case of ZSM-5 zeolites than in the case of Y zeolites. It can be noted that with both Na-ZSM-5 and H-ZSM-5, significant amount of propene is formed. This property has also been observed when cracking petroleum feedstock in the FCC process using ZSM-5 in the catalyst formulation [\u003cspan citationid=\"CR41\" class=\"CitationRef\"\u003e41\u003c/span\u003e]. These results confirm that ZSM-5, during its cracking activity, has a higher capacity to promote the formation of small unsaturated molecules than Y zeolite; iii) with both ZSM-5 and Y zeolites, the presence of sodium induces a decrease in the formation of light products. This result also confirm that protonated zeolites promote the cracking reactions of oleic acid methyl ester towards light compounds.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eThe cracking of OAME over HZSM-5, NaY and HY led to the production of a large number of molecules in the range C8-C12 (kerosene range), the best catalyst being NaY. As aviation transport needs to strongly decrease its carbon emissions, with a possibility of zero net carbon emission by 2050 [\u003cspan citationid=\"CR42\" class=\"CitationRef\"\u003e42\u003c/span\u003e] the necessity to increase the production of green kerosene is mandatory. Then, the present work indicates that one possible way to increase the production of this fuel fraction can be through the addition of some residue biodiesel to the FCC cracking cuts. Other oxygenated molecules such as bio-oil and more probably fatty acids and triglycerides, due their molecular structure close to that of OAME can probably play an additional role in this increasing market.\u003c/p\u003e "},{"header":"4. Conclusions","content":" \u003cp\u003eCatalytic cracking of oleic acid methyl ester (OAME), used as a model molecule of spoiled biodiesel waste, was performed in the presence of ZSM-5 and Y zeolites, both in their acidic and sodium forms. The cracking of pure OAME, without catalyst, under conditions close to that of the FCC process produced mainly linear mono and poly alkenes. The cracking of OAME over HZSM-5 and HY zeolites promoted a high production of aromatics. Ramified saturated hydrocarbons distribution was remarkable when OAME cracking was performed over NaY and HY zeolites, indicating a promotion of alkylation reactions when compared to ZSM-5 with smaller pores. These results suggest that both shape selectivity and acidity, linked to hydrogen transfer play a role in the product distribution. NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). These results may be of great interest to the market for renewable jet fuel since the aviation industry is committed to reduce CO\u003csub\u003e2\u003c/sub\u003e emissions significantly in the coming years.\u003c/p\u003e "},{"header":"Declarations","content":"\u003cp\u003e\u003cstrong\u003eAcknowledgments and Funding\u003c/strong\u003e\u003c/p\u003e\n\u003cp\u003eWe gratefully acknowledge financial support from FINEP, RECAT, National Council for Scientific and Technological Development, CNPq/Universal project 430921/2016-0, CNPq/INCT-EMA, PETROBRAS-ANP-LITPEG contract 0050.0078506.12.9, BNB/FUNDECI project 059/2005, FACEPE, CAPES/PNPD and FAPESB. English revision by Sidney Pratt, Canadian, BA, MAT (The Johns Hopkins University), RSAdip (TEFL) (Cambridge University).\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\u003cli\u003e\u003cspan\u003eAtelge, M.R., Krisa, D., Kumar, G., Eskicioglu, C., Nguyen, D.D., Chang, S.W., Atabani, A.E., Al-Muhtaseb, A.H., Unalan, S.: Biogas production from organic waste: recent progress and perspectives. Waste Biomass Valor. \u003cb\u003e11\u003c/b\u003e, 1019\u0026ndash;1040 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-018-00546-0\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eAhmad, S., Kothari, R., Pathak, V.V., Pandey, M.K.: Fuel quality index: a novel experimental evaluation tool for biodiesel prepared from waste cooking oil. Waste Biomass Valori. \u003cb\u003e10\u003c/b\u003e, 2237\u0026ndash;2247 (2019). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-018-0250-9\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSilva, R.J.M.C.L., Tschoeke, I.C.P., Melo, J.C., Silva, J.P., Pacheco, J.G.A., Silva, J.M.F., Souza, T.P.C.: Comparison between experimental and simulated results of biodiesel production by reactive distillation and energetic assessment. Braz. J. Chem. Eng. \u003cb\u003e36\u003c/b\u003e, 351\u0026ndash;359 (2019). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1590/0104-6632.20190361s20170266\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eNarayanasamy, B., Jeyakumar, N., Balasubramanian, D.: Effect of Star Anise as a Natural Antioxidant Additive on the Oxidation Stability of Lemon Grass Oil. Waste Biomass Valor. (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-020-01218-8\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSingh, M., Singh, D.K., Gandhi, S.K., Sarin, A., Saini, S., Mahla, S.K., Gupta, A., Sandhu, S.S.: Effect of metal contaminants and antioxidants on the oxidation stability of argemone mexicana biodiesel: Experimental and statistical study. Waste Biomass Valor. \u003cb\u003e11\u003c/b\u003e, 6189\u0026ndash;6198 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-019-00886-5\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eXiao, M., Lin, D., Li, Z., Zhao, J., Long, X., Wu, Z.: Synthesis of Biodiesel from Waste Cooking Oil by One-step Esterification and Its Structural Characterization. Waste Biomass Valor. \u003cb\u003e11\u003c/b\u003e, 2087\u0026ndash;2100 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-018-0500-x\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSouza, T.P.C., Silva, R.J.M.C.L., Melo, J.C., Tschoeke, I.C.P., Silva, J.P., Pacheco, J.G.A., Silva, J.M.F.: Kinetic modeling of cottonseed oil transesterification with ethanol. React. Kinet. Mech. Catal. \u003cb\u003e128\u003c/b\u003e, 707\u0026ndash;722 (2019). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s11144-019-01661-2\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eCardoso, C.C., Cavalcanti, A.S., Silva, R.O., Junior, S.A., de Sousa, F.P., Pasa, V.M.D., Arias, S., Pacheco, J.G.A.: Residue-Based CaO Heterogeneous Catalysts from Crab and Mollusk Shells for FAME Production Via Transesterification. J. Braz. Chem. Soc. \u003cb\u003e31\u003c/b\u003e, 756\u0026ndash;767 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.21577/0103-5053.20190240\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFattah, I.M.R., Masjuki, H.H., Kalam, M.A., Mofijur, M., Abedin, M.J.: Effect of antioxidant on the performance and emission characteristics of a diesel engine fueled with palm biodiesel blends. Energ. Convers. Manage. \u003cb\u003e79\u003c/b\u003e, 265\u0026ndash;272 (2014). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.enconman.2013.12.024\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eLuo, Y., Ahmed, I., Kub\u0026aacute;tov\u0026aacute;, A., Šť\u0026aacute;vov\u0026aacute;, J., Aulich, T., Sadrameli, S.M., Seames, W.S.: The thermal cracking of soybean/canola oils and their methyl esters. Fuel Process. Technol. \u003cb\u003e91\u003c/b\u003e, 613\u0026ndash;617: (2010). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.fuproc.2010.01.007\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSeames, W., Luo, Y., Ahmed, I., Aulich, T., Kubatova, A., Št'\u0026aacute;vov\u0026aacute;, J., Kozliak, E.: The thermal cracking of canola and soybean methyl esters: improvement of cold flow properties. Biomass Bionerg. \u003cb\u003e34\u003c/b\u003e, 939\u0026ndash;946 (2010). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.biombioe.2010.02.001\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eHan, J., Sun, H., Ding, Y., Lou, H., Zheng, X.: Palladium-catalyzed decarboxylation of higher aliphatic esters: Towards a new protocol to the second generation biodiesel production. Green Chem. \u003cb\u003e12\u003c/b\u003e, 463\u0026ndash;467 (2010). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1039/B917690J\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDhillon, G.S., Vasudevan, P.T.: Deoxygenation of methyl oleate and commercial biodiesel over W and Ni-W Catalysts. Waste Biomass Valor. (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s12649-020-01146-7\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBezergianni, S., Dimitriadis, A., Kikhtyanin, O., Kubička, D.: Refinery co-processing of renewable feeds. Prog. Energy Combust. Sci. \u003cb\u003e68\u003c/b\u003e, 29\u0026ndash;64 (2018). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.pecs.2018.04.002\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDanuthai, T., Jongpatiwut, S., Rirksomboon, T., Osuwan, S., Resasco, D.E.: Conversion of methylesters to hydrocarbons over an H-ZSM5 zeolite catalyst. Appl. Catal., A. \u003cb\u003e361\u003c/b\u003e, 99\u0026ndash;105 (2009). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.apcata.2009.04.001\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBayat, A., Sadrameli, S.M.: Conversion of canola oil and canola oil methyl ester (CME) to green aromatics over a HZSM-5 catalyst: a comparative study. RSC Adv. \u003cb\u003e5\u003c/b\u003e, 28360\u0026ndash;28368 (2015). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1039/C5RA01691F\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eChiappero, M., Do, P.T.M., Crossley, S., Lobban, L.L., Resasco, D.E.: Direct conversion of triglycerides to olefins and paraffins over noble metal supported catalysts. Fuel. \u003cb\u003e90\u003c/b\u003e, 1155\u0026ndash;1165 (2011). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.fuel.2010.10.025\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSancheti, S.V., Yadav, G.D., Ghosh, P.K.: Synthesis and Application of Novel NiMoK/TS-1 for Selective Conversion of Fatty Acid Methyl Esters/Triglycerides to Olefins. ACS Omega. \u003cb\u003e5\u003c/b\u003e, 5061\u0026ndash;5071 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1021/acsomega.9b03993\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003ePinho, A.R., de Almeida, M.B.B., Mendes, F.L., Ximenes, V.L., Casavechia, L.C.: Co-processing raw bio-oil and gasoil in an FCC unit. Fuel Process. Technol. \u003cb\u003e131\u003c/b\u003e, 159\u0026ndash;166: (2015). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.fuproc.2014.11.008\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eLappas, A.A., Bezergianni, S., Vasalos, I.A.: Production of biofuels via co-processing in conventional refining processes. Catal. Today. \u003cb\u003e145\u003c/b\u003e, 55\u0026ndash;62 (2009). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.cattod.2008.07.001\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eB\u0026uuml;chele, M., Swoboda, M., Reichhold, A., Hofer, W.: Canola oil/glycerol mixtures in a continously operated FCC pilot plant and comparison with vacuum gas oil/glycerol mixtures. Chem. Eng. Process. \u003cb\u003e142\u003c/b\u003e, 107553 (2019). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.cep.2019.107553\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDupain, X., Costa, D.J., Schaverien, C.J., Makkee, M., Moulijn, J.A.: Cracking of a rapeseed vegetable oil under realistic FCC conditions. Appl. Catal. B. \u003cb\u003e72\u003c/b\u003e, 44\u0026ndash;61 (2007). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.apcatb.2006.10.005\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMelero, J.A., Clavero, M.M., Calleja, G., Garc\u0026iacute;a, A., Miravalles, R., Galindo, T.: Production of biofuels via the catalytic cracking of mixtures of crude vegetable oils and nonedible animal fats with vacuum gas oil. Energy Fuels. \u003cb\u003e24\u003c/b\u003e, 707\u0026ndash;717 (2010). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1021/ef900914e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFr\u0026eacute;ty, R., Santos, M.R., Padilha, J.F., Azevedo, A.F., Brand\u0026atilde;o, S.T., Pontes, L.A., Pacheco, J.G.A.: Flash pyrolysis of model compounds adsorbed on catalyst surface: A method for screening catalysts for cracking of fatty molecules. J. Anal. Appl. Pyrolysis. \u003cb\u003e109\u003c/b\u003e, 56\u0026ndash;64 (2014). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.jaap.2014.07.013\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFr\u0026eacute;ty, R., Santos, M.R., Sales, R.F., Silva, A.O.S., Barbosa, C.B.M., Pacheco, J.G.A.: Flash pyrolysis of oleic acid as a model compound adsorbed on supported nickel catalysts for biofuel production. J. Braz. Chem. Soc. \u003cb\u003e25\u003c/b\u003e, 2433\u0026ndash;2443 (2014). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.5935/0103-5053.20140270\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSantos, M.R., Sales, R.F., Silva, A.O.S., Teixeira, C.M., Pacheco, J.G.A., Fr\u0026eacute;ty, R.: Flash pyrolysis of myristic acid adsorbed on supported nickel catalysts for biofuel production. J. Therm. Anal. Calorim. \u003cb\u003e119\u003c/b\u003e, 1875\u0026ndash;1885 (2015). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s10973-014-4375-1\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGary, J.H., Handwerk, G.E., Kaiser, M.J.: Petroleum refining: technology and economics. CRC Press, Boca Raton (2007)\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSantos, M.R., Arias, S., Padilha, J.F., Carneiro, M.C.N., Sales, E.A., Pacheco, J.G.A., Fr\u0026eacute;ty, R.: Catalytic cracking of palmitic and oleic acids pre-adsorbed on γ-alumina. Catal. Today. \u003cb\u003e344\u003c/b\u003e, 234\u0026ndash;239 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.cattod.2019.04.005\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eOmidghane, M., Bartoli, M., Asomaning, J., Xia, L., Chae, M., Bressler, D.C.: Pyrolysis of fatty acids derived from hydrolysis of brown grease with biosolids. Environ. Sci. Pollut. Res. \u003cb\u003e27\u003c/b\u003e, 26395\u0026ndash;26405 (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1007/s11356-020-09041-3\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMaher, M.K., Kirkwood, K.M., Gray, M.R., Bressler, D.C.: Pyrolytic decarboxylation and cracking of stearic acid. Ind. Eng. Chem. Res. \u003cb\u003e47\u003c/b\u003e, 5328\u0026ndash;5336 (2008). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1021/ie0714551\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eLappi, H., Al\u0026eacute;n, R.: Production of vegetable oil-based biofuels-Thermochemical behavior of fatty acid sodium salts during pyrolysis. J. Anal. Appl. Pyrolysis. \u003cb\u003e86\u003c/b\u003e, 274\u0026ndash;280 (2009). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.jaap.2009.07.005\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eAsomaning, J., Mussone, P., Bressler, D.C.: Thermal deoxygenation and pyrolysis of oleic acid. J. Anal. Appl. Pyrolysis. \u003cb\u003e105\u003c/b\u003e, 1\u0026ndash;7 (2014). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.jaap.2013.09.005\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eArias, S., Gonz\u0026aacute;lez, J.F., Sousa, L.V., Barbosa, C.B.M., Silva, A.O.S., Fr\u0026eacute;ty, R., Pacheco, J.G.A.: Influence of Ni/Al ratio on the fast pyrolysis of myristic acid when adsorbed on unsupported mixed oxides derived from layered double hydroxides. Catal. Today (2020). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.cattod.2020.07.028\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMante, O.D., Agblevor, F.A., Oyama, S.T., McClung, R.: Catalytic pyrolysis with ZSM-5 based additive as co-catalyst to Y-zeolite in two reactor configurations. Fuel. \u003cb\u003e117\u003c/b\u003e, 649\u0026ndash;659 (2014). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.fuel.2013.09.034\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKotrel, S., Rosynek, M.P., Lunsford, J.H.: Quantification of acid sites in H-ZSM-5, H-β, and HY zeolites. J. Catal. \u003cb\u003e182\u003c/b\u003e, 278\u0026ndash;281 (1999). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1006/jcat.1998.2339\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDenayer, J.F., Souverijns, W., Jacobs, P.A., Martens, J.A., Baron, G.V.: High-temperature low-pressure adsorption of branched C\u003csub\u003e5\u003c/sub\u003e-C\u003csub\u003e8\u003c/sub\u003e alkanes on zeolite Beta, ZSM-5, ZSM-22, zeolite Y, and mordenite. J. Phys. Chem. B. \u003cb\u003e102\u003c/b\u003e, 4588\u0026ndash;4597 (1998). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1021/jp980674k\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMihalcik, D.J., Mullen, C.A., Boateng, A.A.: Screening acidic zeolites for catalytic fast pyrolysis of biomass and its components. J. Anal. Appl. Pyrolysis. \u003cb\u003e92\u003c/b\u003e, 224\u0026ndash;232 (2011). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.jaap.2011.06.001\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKub\u0026aacute;tov\u0026aacute;, A., Št\u0026rsquo;\u0026aacute;vov\u0026aacute;, J., Seames, W.S., Luo, Y., Sadrameli, S.M., Linnen, M.J., Baglayeva, G.V., Smoliakova, I.P., Kozliak, E.I.: Triacylglyceride thermal cracking: Pathways to cyclic hydrocarbons. Energy Fuels. \u003cb\u003e26\u003c/b\u003e, 672\u0026ndash;685 (2012). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1021/ef200953d\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGuisnet, M., Magnoux, P.: Organic chemistry of coke formation. Appl. Catal. A. \u003cb\u003e212\u003c/b\u003e, 83\u0026ndash;\u003cb\u003e96\u003c/b\u003e (2001). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/S0926-860X(00)00845-0\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eTeixeira, C.M., Frety, R., Barbosa, C.B.M., Santos, M.R., Bruce, E.D., Pacheco, J.G.A.: Mo influence on the kinetics of jatropha oil cracking over Mo/HZSM-5 catalysts. Catal. Today. \u003cb\u003e279\u003c/b\u003e, 202\u0026ndash;208 (2017). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/j.cattod.2016.06.006\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBuchanan, J.S.: The chemistry of olefins production by ZSM-5 addition to catalytic cracking units. Catal. Today. \u003cb\u003e55\u003c/b\u003e, 207\u0026ndash;212 (2000). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1016/S0920-5861(99)00248-5\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSchmidt, P., Batteiger, V., Roth, A., Weindorf, W., Raksha, T.: Power-to‐liquids as renewable fuel option for aviation: A review. Chem. Ing. Tech. \u003cb\u003e90\u003c/b\u003e, 127\u0026ndash;140 (2018). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1002/cite.201700129\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":true,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"waste-and-biomass-valorization","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"wave","sideBox":"Learn more about [Waste and Biomass Valorization](http://link.springer.com/journal/12649)","snPcode":"12649","submissionUrl":"https://submission.nature.com/new-submission/12649/3","title":"Waste and Biomass Valorization","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Biodiesel, cracking, co-processing, fast pyrolysis, hydrocarbons, zeolite","lastPublishedDoi":"10.21203/rs.3.rs-224425/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-224425/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eOne way to take advantage from out of specification biodiesel and waste from biodiesel tank bottom drainage is to co-process them in a fluidized catalytic cracking (FCC) unit. The present work deals with the cracking of oleic acid methyl ester (OAME) as a biodiesel model, under conditions close to that of FCC process over ZSM-5 and Y zeolites, either in protonated or sodium forms, for the production of deoxygenated compounds. Catalytic fast cracking of OAME pre-adsorbed on the catalyst surface was performed, with a catalyst:OAME mass ratio of 10:1 in a micro-pyrolysis system at 650\u0026deg;C, coupled to a GC/MS for on line analysis of the products. Results show that the cracking of OAME without a catalyst favored the formation of linear alkenes and polyenes. Fast cracking of OAME over HZSM-5 and HY acidic zeolites led to the production of aromatics, due to hydrogen transfer. Cracking over NaY and HY zeolites produced remarkable amounts of ramified saturated hydrocarbons. The formation of alkylated hydrocarbons was not significant over ZSM-5 zeolite probably due to a small pore size of this zeolite. NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). Low acidic zeolites favored the production of non-aromatic hydrocarbons. Product distribution was affected by catalyst shape selectivity and acidity. These results show that residues from the biodiesel chain can be directly co-processed in FCC units to obtain high value hydrocarbons, mainly in the jet fuel and gasoline ranges.\u003c/p\u003e","manuscriptTitle":"Deoxygenation of oleic acid methyl ester in FCC process conditions over protonated and sodium exchanged Y and ZSM-5 zeolites","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2021-03-11 19:37:51","doi":"10.21203/rs.3.rs-224425/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"reviewersInvited","content":"","date":"2021-03-09T00:00:00+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2021-03-09T00:00:00+00:00","index":0,"fulltext":""},{"type":"editorInvited","content":"Waste and Biomass Valorization","date":"2021-03-04T00:00:00+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2021-02-12T00:00:00+00:00","index":"","fulltext":""},{"type":"submitted","content":"Waste and Biomass Valorization","date":"2021-02-08T15:52:36+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"waste-and-biomass-valorization","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"wave","sideBox":"Learn more about [Waste and Biomass Valorization](http://link.springer.com/journal/12649)","snPcode":"12649","submissionUrl":"https://submission.nature.com/new-submission/12649/3","title":"Waste and Biomass Valorization","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"ab2e78b7-c808-4cf4-b82a-df623d3eeb56","owner":[],"postedDate":"March 11th, 2021","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":2914935,"name":"Chemical Engineering"}],"tags":[],"updatedAt":"2022-01-13T10:29:44+00:00","versionOfRecord":{"articleIdentity":"rs-224425","link":"https://doi.org/10.1007/s12649-021-01505-y","journal":{"identity":"waste-and-biomass-valorization","isVorOnly":false,"title":"Waste and Biomass Valorization"},"publishedOn":"2021-06-27 10:29:44","publishedOnDateReadable":"June 27th, 2021"},"versionCreatedAt":"2021-03-11 19:37:51","video":"","vorDoi":"10.1007/s12649-021-01505-y","vorDoiUrl":"https://doi.org/10.1007/s12649-021-01505-y","workflowStages":[]},"version":"v1","identity":"rs-224425","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-224425","identity":"rs-224425","version":["v1"]},"buildId":"WrCJVZZCHTDjtuVLN7oU0","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}