Study on Denitrification Performance and Mechanism of NH 3 - SCR Catalyst for Modification of Rare Earth Tailings by Ce Combined with Mn

Study on Denitrification Performance and Mechanism of NH 3 - SCR Catalyst for Modification of Rare Earth Tailings by Ce Combined with Mn | 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 Study on Denitrification Performance and Mechanism of NH 3 - SCR Catalyst for Modification of Rare Earth Tailings by Ce Combined with Mn Xiankang Sun, Jiaming Li, Linbo Lu, Tiantian Wang, Wenfei Wu, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5163376/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 08 Jan, 2025 Read the published version in Research on Chemical Intermediates → Version 1 posted 9 You are reading this latest preprint version Abstract CeMn-rare earth tailings catalysts with wide temperature window and high denitrification were prepared by hydrothermal method. The results show that the optimum ratio of Ce/Mn is 1:1, and the NO x conversion can reach 90% at the range of 100–300℃. The introduction of Mn improves the dispersion of CeCO 3 F on the catalyst surface, exposing more active adsorption sites. In addition, the interaction of MnO x with Ce and Fe in the rare earth tailings promotes redox, which facilitates the oxidation of NO to NO 2 . Meanwhile Mn also increases the abundance and stability of NO adsorption species and Lewis acid sites, forming important intermediates such as Mn 4+ -ONO 2 , NH 4 NO 3 and NH 2 NO. But the strong oxidizing ability of Mn and the reaction between monodentate nitrate and adsorbed NH 3 results in N 2 selectivity decrease rapidly. Catalysts follow both E-R and L-H mechanism in the NH 3 -SCR reaction. Moreover, the excellent redox performance and Lewis acid sites improve the NH 3 -SCR catalytic activity together. CeO2 MnOx rare earth tailings NH3-SCR denitrification mechanism Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 08 Jan, 2025 Read the published version in Research on Chemical Intermediates → Version 1 posted Editorial decision: Revision requested 23 Nov, 2024 Reviews received at journal 23 Nov, 2024 Reviewers agreed at journal 23 Nov, 2024 Reviews received at journal 29 Oct, 2024 Reviewers agreed at journal 16 Oct, 2024 Reviewers invited by journal 15 Oct, 2024 Editor assigned by journal 29 Sep, 2024 Submission checks completed at journal 29 Sep, 2024 First submitted to journal 27 Sep, 2024 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. 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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-5163376","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":381657403,"identity":"972c19d5-d7e5-4143-901a-a285aeef606c","order_by":0,"name":"Xiankang Sun","email":"","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Xiankang","middleName":"","lastName":"Sun","suffix":""},{"id":381657404,"identity":"98aa4c10-296c-441b-8040-8b279d2ad33f","order_by":1,"name":"Jiaming Li","email":"","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Jiaming","middleName":"","lastName":"Li","suffix":""},{"id":381657406,"identity":"040116c2-6e93-4640-a21f-a8fe78d275f3","order_by":2,"name":"Linbo Lu","email":"","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Linbo","middleName":"","lastName":"Lu","suffix":""},{"id":381657407,"identity":"e5e7cebb-447f-4385-8102-309612eb0128","order_by":3,"name":"Tiantian Wang","email":"","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Tiantian","middleName":"","lastName":"Wang","suffix":""},{"id":381657408,"identity":"df88fa55-c57d-4180-ae0d-aff07778644b","order_by":4,"name":"Wenfei Wu","email":"","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Wenfei","middleName":"","lastName":"Wu","suffix":""},{"id":381657409,"identity":"7521ca83-9ebb-4e49-a43e-7606a7106218","order_by":5,"name":"Limin Hou","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAApElEQVRIiWNgGAWjYHACNoYHDDY8/PwNpGhJYEiTkZxxgDQth20MGhKIVG/O3mP2IDHnPI8BwwHGDx9ziNBi2XPG3CBx220ec+YGZsmZ24jQYnAjx0wCpMWy4QAbMy9RWu6/AWk5x2NwIIFYLTd4QFoOkKLlTFoZUEsyj+SMg81E+uX44W0SH7fZ2fPzNx/88JEYLUiAsYE09aNgFIyCUTAKcAMAWa01MTkNt5YAAAAASUVORK5CYII=","orcid":"","institution":"Inner Mongolia University of Science and Technology","correspondingAuthor":true,"prefix":"","firstName":"Limin","middleName":"","lastName":"Hou","suffix":""}],"badges":[],"createdAt":"2024-09-27 08:08:12","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-5163376/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-5163376/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1007/s11164-024-05479-z","type":"published","date":"2025-01-08T15:57:02+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":73695250,"identity":"562ef998-c830-4382-9921-243f17790914","added_by":"auto","created_at":"2025-01-13 16:14:38","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1656655,"visible":true,"origin":"","legend":"","description":"","filename":"Manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5163376/v1_covered_00e6f8d6-62b6-42b6-9460-64a7149426f2.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Study on Denitrification Performance and Mechanism of NH 3 - SCR Catalyst for Modification of Rare Earth Tailings by Ce Combined with Mn","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"research-on-chemical-intermediates","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"rint","sideBox":"Learn more about [Research on Chemical Intermediates](http://link.springer.com/journal/11164)","snPcode":"11164","submissionUrl":"https://submission.nature.com/new-submission/11164/3","title":"Research on Chemical Intermediates","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"CeO2, MnOx, rare earth tailings, NH3-SCR, denitrification mechanism","lastPublishedDoi":"10.21203/rs.3.rs-5163376/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5163376/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eCeMn-rare earth tailings catalysts with wide temperature window and high denitrification were prepared by hydrothermal method. The results show that the optimum ratio of Ce/Mn is 1:1, and the NO\u003csub\u003ex\u003c/sub\u003e conversion can reach 90% at the range of 100\u0026ndash;300℃. The introduction of Mn improves the dispersion of CeCO\u003csub\u003e3\u003c/sub\u003eF on the catalyst surface, exposing more active adsorption sites. In addition, the interaction of MnO\u003csub\u003ex\u003c/sub\u003e with Ce and Fe in the rare earth tailings promotes redox, which facilitates the oxidation of NO to NO\u003csub\u003e2\u003c/sub\u003e. Meanwhile Mn also increases the abundance and stability of NO adsorption species and Lewis acid sites, forming important intermediates such as Mn\u003csup\u003e4+\u003c/sup\u003e-ONO\u003csub\u003e2\u003c/sub\u003e, NH\u003csub\u003e4\u003c/sub\u003eNO\u003csub\u003e3\u003c/sub\u003e and NH\u003csub\u003e2\u003c/sub\u003eNO. But the strong oxidizing ability of Mn and the reaction between monodentate nitrate and adsorbed NH\u003csub\u003e3\u003c/sub\u003e results in N\u003csub\u003e2\u003c/sub\u003e selectivity decrease rapidly. Catalysts follow both E-R and L-H mechanism in the NH\u003csub\u003e3\u003c/sub\u003e-SCR reaction. Moreover, the excellent redox performance and Lewis acid sites improve the NH\u003csub\u003e3\u003c/sub\u003e-SCR catalytic activity together.\u003c/p\u003e","manuscriptTitle":"Study on Denitrification Performance and Mechanism of NH 3 - SCR Catalyst for Modification of Rare Earth Tailings by Ce Combined with Mn","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-12-09 04:20:08","doi":"10.21203/rs.3.rs-5163376/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2024-11-23T07:30:58+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-11-23T07:13:25+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"17845338296171781671922522480829119800","date":"2024-11-23T06:30:47+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-10-30T02:01:14+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"167744679454525158167801853642256462685","date":"2024-10-17T01:02:48+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2024-10-16T01:56:48+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2024-09-30T02:54:20+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2024-09-30T02:53:22+00:00","index":"","fulltext":""},{"type":"submitted","content":"Research on Chemical Intermediates","date":"2024-09-27T08:03:37+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"research-on-chemical-intermediates","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"rint","sideBox":"Learn more about [Research on Chemical Intermediates](http://link.springer.com/journal/11164)","snPcode":"11164","submissionUrl":"https://submission.nature.com/new-submission/11164/3","title":"Research on Chemical Intermediates","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"3e086b68-1432-48c3-8283-26184da92ccc","owner":[],"postedDate":"December 9th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[],"tags":[],"updatedAt":"2025-01-13T16:12:44+00:00","versionOfRecord":{"articleIdentity":"rs-5163376","link":"https://doi.org/10.1007/s11164-024-05479-z","journal":{"identity":"research-on-chemical-intermediates","isVorOnly":false,"title":"Research on Chemical Intermediates"},"publishedOn":"2025-01-08 15:57:02","publishedOnDateReadable":"January 8th, 2025"},"versionCreatedAt":"2024-12-09 04:20:08","video":"","vorDoi":"10.1007/s11164-024-05479-z","vorDoiUrl":"https://doi.org/10.1007/s11164-024-05479-z","workflowStages":[]},"version":"v1","identity":"rs-5163376","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-5163376","identity":"rs-5163376","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}