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Temperature reversible synergistic formation of cerium oxyhydride and Au hydride: a combined XAS and XPDF study

Clark, AH; Acerbi, N; Chater, PA; Hayama, S; Collier, P; Hyde, TI; Sankar, G; (2020) Temperature reversible synergistic formation of cerium oxyhydride and Au hydride: a combined XAS and XPDF study. Physical Chemistry Chemical Physics 10.1039/d0cp00455c. (In press). Green open access

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Abstract

In situ studies on the physical and chemical properties of Au in inverse ceria alumina supported catalysts have been conducted between 295 and 623 K using high energy resolved fluorescence detection X-ray absorption near edge spectroscopy and X-ray total scattering. Precise structural information is extracted on the metallic Au phase present in a 0.85 wt% Au containing inverse ceria alumina catalyst (ceria/Au/alumina). Herein evidence for the formation of an Au hydride species at elevated temperature is presented. Through modelling of total scattering data to extract the thermal properties of Au using Grüneisen theory of volumetric thermal expansion it proposed that the Au Hydride formation occurs synergistally with the formation of a cerium oxyhydride. The temperature reversible nature, whilst remaining in a reducing atmosphere, demonstrates the activation of hydrogen without consumption of oxygen from the supporting ceria lattice.

Type: Article
Title: Temperature reversible synergistic formation of cerium oxyhydride and Au hydride: a combined XAS and XPDF study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d0cp00455c
Language: English
Additional information: Open Access Article. This article is licensed under a Creative Commons Attribut
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10107453
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