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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

Publisher, publication year, extent ...

  • Elsevier BV,2020

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:a689b88a-83c0-4413-b5d3-f599952446c4
  • https://doi.org/10.1016/j.apcatb.2020.118722DOI
  • https://research.chalmers.se/publication/515810URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275593URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • QC 20200608
  • 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)
  • Mesilov, Vitaly V.Yale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore. (author)
  • Xiao, YangYale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore. (author)
  • Englund, Johanna,1988Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden.(Swepub:cth)johancar (author)
  • Xi, ShiboASTAR, Singapore Synchrotron Light Source, ICES, Singapore 117603, Singapore. (author)
  • Tang, ChunhuaUniversiti Kebangsaan Singapura (NUS),National University of Singapore (NUS),Natl Univ Singapore, Mat Sci & Engn, Singapore 117575, Singapore. (author)
  • Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden.(Swepub:cth)skoglund (author)
  • Pettersson, Lars J.KTH,Kemiteknik,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1kcgmtv (author)
  • Bernasek, Steven L.Yale NUS College,Yale NUS Coll, Sci Div, Singapore 138527, Singapore. (author)
  • Yale NUS CollegeYale NUS Coll, Sci Div, Singapore 138527, Singapore. (creator_code:org_t)

Related titles

  • In:Applied Catalysis B: Environmental: Elsevier BV2690926-33731873-3883

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