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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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2021-03, Vol.23 (10), p.5888-5896
Main Authors: Lais, Tahmin, Lukashuk, Liliana, van de Water, Leon, Hyde, Timothy I, Aramini, Matteo, Sankar, Gopinathan
Format: Article
Language:English
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.
ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp06468h