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dc.date.accessioned2020-01-10T20:28:23Z
dc.date.available2020-01-10T20:28:23Z
dc.date.created2018-11-28T09:45:04Z
dc.date.issued2018
dc.identifier.citationBorfecchia, Elisa Beato, Pablo Svelle, Stian Olsbye, Unni Lamberti, Carlo Bordiga, Silvia . Cu-CHA – a model system for applied selective redox catalysis. Chemical Society Reviews. 2018, 47(22), 8097-8133
dc.identifier.urihttp://hdl.handle.net/10852/72090
dc.description.abstractWe review the structural chemistry and reactivity of copper-exchanged molecular sieves with chabazite (CHA) topology, as an industrially applied catalyst in ammonia mediated reduction of harmful nitrogen oxides (NH3-SCR) and as a general model system for red-ox active materials (also the recent results in the direct conversion of methane to methanol are considered). Notwithstanding the apparent structural simplicity of the material, a crystalline zeolite with only one crystallographically independent T site, the Cu-SSZ-13 catalyst reveals a high degree of complexity that has been decrypted by state of the art characterization tools. From the reviewed data, the following important aspects in the understanding of the Cu-SSZ-13 catalyst clearly emerged: (i) the structural dynamics of the Cu-species require precise control of the environmental conditions during activation and characterization; (ii) the availability of a large library of well-defined catalysts with different Si/Al and Cu/Al compositional ratios is key in unravelling the red-ox properties of the active Cu sites; (iii) a multi-technique approach is required, combining complementary techniques able to provide independent structural, electronic and vibrational information; (iv) synchrotron radiation based techniques (EXAFS, XANES, XES and time-resolved powder XRD) played a relevant role; (v) operando methodology (possibly supported by advanced chemometric approaches) is essential in obtaining structure–reactivity relations; (vi) the support of theoretical studies has been indispensable for the interpretation of the experimental output from characterization and for a critical assessment of mechanistic models. The old literature that classified Cu-exchanged zeolites in the category of single-site catalysts has been partially disproved by the recent advanced studies where it has been shown that the active site in the low temperature NH3-SCR catalyst is a mobile Cu-molecular entity that “lives in symbiosis” with an inorganic solid framework. Only in the high temperature NH3-SCR regime do the mobile Cu-species lose their ligands and find docking sites at the internal walls of the zeolite framework, thus reflecting the idea of a single-site catalyst. After a brief introduction, the review is divided into three main parts devoted to characterization (Section 2), reactivity (Section 3), and industrial applications (Section 4), followed by some concluding remarks and providing a perspective of the field.
dc.languageEN
dc.publisherRSC Publishing
dc.titleCu-CHA – a model system for applied selective redox catalysis
dc.typeJournal article
dc.creator.authorBorfecchia, Elisa
dc.creator.authorBeato, Pablo
dc.creator.authorSvelle, Stian
dc.creator.authorOlsbye, Unni
dc.creator.authorLamberti, Carlo
dc.creator.authorBordiga, Silvia
cristin.unitcode185,15,12,54
cristin.unitnameKatalyse
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1
dc.identifier.cristin1636137
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemical Society Reviews&rft.volume=47&rft.spage=8097&rft.date=2018
dc.identifier.jtitleChemical Society Reviews
dc.identifier.volume47
dc.identifier.issue22
dc.identifier.startpage8097
dc.identifier.endpage8133
dc.identifier.doihttps://doi.org/10.1039/c8cs00373d
dc.identifier.urnURN:NBN:no-75203
dc.type.documentTidsskriftartikkel
dc.source.issn0306-0012
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/72090/1/RSC_rev_Cu_CHA_format.pdf
dc.type.versionSubmittedVersion
dc.relation.projectNFR/237922


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