期刊
CATALYSIS TODAY
卷 145, 期 3-4, 页码 251-257出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2008.10.034
关键词
Alcohol; Gold; Oxidation; Palladium; XPS
资金
- Engineering and Physical Sciences Research Council [EP/E046754/1, EP/G007594/1] Funding Source: researchfish
- EPSRC [EP/G007594/1, EP/E046754/1] Funding Source: UKRI
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. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
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