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Elucidation of copper environment in a Cu–Cr–Fe oxide catalyst through in situ high-resolution XANES investigation†
Tahmin Lais,Liliana Lukashuk,Leon van de Water,Timothy I. Hyde,Matteo Aramini,Gopinathan Sankar
Physical Chemistry Chemical Physics Pub Date : 02/19/2021 00:00:00 , DOI:10.1039/D0CP06468H
Abstract

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.

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