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

DOI: 10.1039/D0CP06468H DOI Help

Authors: Tahmin Lais (University College London (UCL)) , Liliana Lukashuk (Johnson Matthey) , Leon Van De Water (Johnson Matthey) , Tim Hyde (Johnson Matthey) , Matteo Aramini (Diamond Light Source) , Gopinathan Sankar (University College London)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics

State: Published (Approved)
Published: February 2021
Diamond Proposal Number(s): 18039

Open Access Open Access

Abstract: Copper containing oxides 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, 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.

Subject Areas: Chemistry


Instruments: I20-Scanning-X-ray spectroscopy (XAS/XES)

Documents:
d0cp06468h.pdf

Discipline Tags:

Catalysis Inorganic Chemistry Physical Chemistry Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)