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In-situ XPS study on the reducibility of Pd-promoted Cu/CeO2 catalysts for the oxygen-assisted water-gas-shift reaction

Fox, Elise B., Lee, Adam Fraser, Wilson, Karen and Song, Chunshan 2008. In-situ XPS study on the reducibility of Pd-promoted Cu/CeO2 catalysts for the oxygen-assisted water-gas-shift reaction. Topics in Catalysis 49 (1-2) , pp. 89-96. 10.1007/s11244-008-9063-6

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Abstract

Cu/CeO(2), Pd/CeO(2), and CuPd/CeO(2) catalysts were prepared and their reduction followed by in-situ XPS in order to explore promoter and support interactions in a bimetallic CuPd/CeO(2) catalyst effective for the oxygen-assisted water-gas-shift (OWGS) reaction. Mutual interactions between Cu, Pd, and CeO(2) components all affect the reduction process. Addition of only 1 wt% Pd to 30 wt% Cu/CeO(2) greatly enhances the reducibility of both dispersed CuO and ceria support. In-vacuo reduction (inside XPS chamber) up to 400 C results in a continuous growth of metallic copper and Ce(3+) surface species, although higher temperatures results in support reoxidation. Supported copper in turn destabilizes metallic palladium metal with respect to PdO, this mutual perturbation indicating a strong intimate interaction between the Cu-Pd components. Despite its lower intrinsic reactivity towards OWGS, palladium addition at only 1 wt% loading significantly improved CO conversion in OWGS reaction over a monometallic 30 wt% Cu/CeO(2) catalysts, possibly by helping to maintain Cu in a reduced state during reaction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Publisher: Springer/Plenum Publishers
ISSN: 1022-5528
Last Modified: 19 Mar 2016 22:43
URI: http://orca-mwe.cf.ac.uk/id/eprint/25069

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