Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 23, Issue 10, Pages 5888-5896Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp06468h
Keywords
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Funding
- EPSRC
- UCL
- Johnson Matthey
- EPSRC [1934482] Funding Source: UKRI
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By utilizing Cu K-edge high resolution XANES, the local environment of Cu2+ ions in a Cu-Cr-Fe oxide catalyst during thermal treatment was determined to be a distorted octahedral geometry, ruling out other symmetries such as tetrahedral or square planar.
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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