Elucidation of copper environment in a Cu–Cr–Fe oxide catalyst through in situ high-resolution XANES investigation. Issue 10 (4th March 2021)

• Record Type: Journal Article
• Authors: Lais, Tahmin; Lukashuk, Liliana; van de Water, Leon; Hyde, Timothy I.; Aramini, Matteo; Sankar, Gopinathan
• Is Part Of: Physical chemistry chemical physics. Volume 23:Issue 10(2021)
• Page Start: 5888
• Page End: 5896
• Publication Date: 2021-03-04
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d0cp06468h
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Local structure of copper ions in Cu–Cr–Fe mixed metal oxide revealed through in situ high-resolution XANES investigation. 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 Cu 2+ ions. The information gained from this investigation rules out the presence of Cu 2+ ions in a tetrahedral or square planar geometry, a mixture of these sites, or in a reduced oxidation state. Evidence is presented that the Cu 2+ ions in the Cu–Cr–Fe oxide system are present in a distorted octahedral environment.