Elucidation of copper environment in a Cu-Cr-Fe oxide catalyst through in situ high-resolution XANES investigation

Copper containing materials are widely used in a range of catalytic applications. Here, we report the use of Cu K-edge high resolution XANES to determine the local site symmetry of copper ions during the thermal treatment of a Cu-Cr-Fe oxide catalyst. We exploited the Cu K-edge XANES spectral featur...

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Published inPhysical chemistry chemical physics : PCCP Vol. 23; no. 10; pp. 5888 - 5896
Main Authors Lais, Tahmin, Lukashuk, Liliana, van de Water, Leon, Hyde, Timothy I, Aramini, Matteo, Sankar, Gopinathan
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 18.03.2021
Subjects
Catalysts
Chromium
Copper
Heat treatment
High resolution
Iron
Oxidation
Valence
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Summary:Copper containing materials are widely used in a range of catalytic applications. Here, we report the use of Cu K-edge high resolution XANES to determine the local site symmetry of copper ions during the thermal treatment of a Cu-Cr-Fe oxide catalyst. We exploited the Cu K-edge XANES spectral features, in particular the correlation between area under the pre-edge peak and its position to determine the local environment of Cu2+ ions. The information gained from this investigation rules out the presence of Cu2+ ions in a tetrahedral or square planar geometry, a mixture of these sites, or in a reduced oxidation state. Evidence is presented that the Cu2+ ions in the Cu-Cr-Fe oxide system are present in a distorted octahedral environment.
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ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp06468h