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In situ X-ray studies of crotyl alcohol selective oxidation over Au/Pd(111) surface alloys

Lee, Adam Fraser, Hackett, S., Hutchings, Graham John ORCID:, Lizzit, S., Naughton, J. and Wilson, Karen 2009. In situ X-ray studies of crotyl alcohol selective oxidation over Au/Pd(111) surface alloys. Catalysis Today 145 (3-4) , pp. 251-257. 10.1016/j.cattod.2008.10.034

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The selective oxidation of crotyl alcohol to crotonaldehyde over ultrathin Au overlayers on Pd(1 1 1) and Au/Pd(1 1 1) surface alloys has been investigated by time-resolved X-ray photoelectron spectroscopy (XPS) and mass spectrometry. Pure gold is catalytically inert towards crotyl alcohol which undergoes reversible adsorption. In contrast, thermal processing of a 3.9 monolayer (ML) gold overlayer allows access to a range of AuPd surface alloy compositions, which are extremely selective towards crotonaldehyde production, and greatly reduce the extent of hydrocarbon decomposition and eventual carbon laydown compared with base Pd(1 1 1). XPS and CO titrations suggest that palladium-rich surface alloys offer the optimal balance between alcohol oxidative dehydrogenation activity while minimising competitive decomposition pathways, and that Pd monomers are not the active surface ensemble for such selox chemistry over AuPd alloys.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: alcohol ; gold ; oxidation ; palladium ; XPS.
Publisher: Elsevier
ISSN: 0920-5861
Last Modified: 18 Oct 2022 13:12

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