Abstract: Ceria-supported copper catalysts exhibit high catalytic performance in the preferential oxidation of CO in excess H2 (CO PROX). Highly dispersed copper oxide species have been experimentally identified as active centers. However, structural diagnostics of highly dispersed CuOx species and CuOx/CeO2 interface areas remains a challenge. Here, we report a comprehensive structural study of a supported CuO/CeO2 catalyst (5 wt% Cu) showing good activity in the CO PROX process. X-ray absorption spectroscopy (XAS) techniques and X-ray atomic pair distribution function (PDF) analysis were used as efficient methods for probing the atomic resolution structure. It was established that the catalyst contains Cu2+ species, mainly in the form of ultra-dispersed CuO-like particles and copper oxide clusters. Analysis of the local atomic arrangement revealed an interaction between copper ions and ceria surface. Oxygen-terminated {100} ceria facets can accommodate Cu2+ ions in square planar coordination. Moreover, some Cu ions are inserted into the CeO2 crystal structure, forming a substitutional solid solution.

Cite: Pakharukova V.P. , Kriventsov V.V. , Ishchenko A.V. , Potemkin D.I. , Snytnikov P.V.
Structural Studies of Copper Species in Supported CuO/CeO2 Catalyst by X-ray Absorption Spectroscopy Coupled with Pair Distribution Function Analysis
Journal of Cluster Science. 2025. V.36. 18 . DOI: 10.1007/s10876-024-02727-5 WOS Scopus AN OpenAlex publication_identifier_short.sciact_skif_identifier_type

Dates:

Submitted:	Jun 3, 2024
Accepted:	Oct 18, 2024
Published online:	Dec 3, 2024

Identifiers:

Web of science:	WOS:001369656800001
Scopus:	2-s2.0-85211358296
Chemical Abstracts:	2024:2683151
OpenAlex:	W4404953031
publication_identifier.sciact_skif_identifier_type:	3630

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