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In-situ studies of ...
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Bergman, Susanna L.Yale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
(author)
In-situ studies of oxidation/reduction of copper in Cu-CHA SCR catalysts: Comparison of fresh and SO2-poisoned catalysts
- Article/chapterEnglish2020
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LIBRIS-ID:oai:research.chalmers.se:a689b88a-83c0-4413-b5d3-f599952446c4
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https://doi.org/10.1016/j.apcatb.2020.118722DOI
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https://research.chalmers.se/publication/515810URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275593URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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QC 20200608
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SO2-poisoning results in deactivation of Cu-CHA SCR under standard SCR conditions; however regeneration at 700 °C completely restores the SCR performance. To understand the nature of these effects, Cu-species in the fresh and poisoned catalysts were characterized by in-situ temperature-dependent time-resolved Cu K-edge X-ray absorption spectroscopy using the multivariate curve resolution alternating least squares (MCR-ALS) approach and continuous Cauchy wavelet transforms. The extracted chemically-meaningful reference spectra of Cu-species were analyzed by DFT-assisted XANES calculations. Cu-bisulfates were found as the most energetically favorable poisoned Cu-species. The response of Cu-species to a reducing environment differs in the fresh and SO2-poisoned catalysts. Differences in reducibility are related to the formation of quasi-linear Cu-complexes in the SO2-poisoned catalyst formed during heating in H2/He. Heating in H2/He leads to partial desulfurization of the poisoned catalyst. Cooling in H2/He after heating results in more facile formation of Cu-metal clusters in fresh catalyst than in SO2-poisoned.
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Dahlin, SandraKTH,Processteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1k6111x
(author)
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Mesilov, Vitaly V.Yale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
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Xiao, YangYale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
(author)
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Englund, Johanna,1988Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden.(Swepub:cth)johancar
(author)
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Xi, ShiboASTAR, Singapore Synchrotron Light Source, ICES, Singapore 117603, Singapore.
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Tang, ChunhuaUniversiti Kebangsaan Singapura (NUS),National University of Singapore (NUS),Natl Univ Singapore, Mat Sci & Engn, Singapore 117575, Singapore.
(author)
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Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden.(Swepub:cth)skoglund
(author)
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Pettersson, Lars J.KTH,Kemiteknik,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1kcgmtv
(author)
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Bernasek, Steven L.Yale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
(author)
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Yale NUS CollegeYale NUS Coll, Sci Div, Singapore 138527, Singapore.
(creator_code:org_t)
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In:Applied Catalysis B: Environmental: Elsevier BV2690926-33731873-3883
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