In situ studies of titania-supported Au shell-Pd core nanoparticles for the selective aerobic oxidation of crotyl alcohol

Lee, Adam Fraser, Ellis, Christine Victoria, Wilson, Karen and Hondow, N. S. 2010. In situ studies of titania-supported Au shell-Pd core nanoparticles for the selective aerobic oxidation of crotyl alcohol. Catalysis Today 157 (1-4) , pp. 243-249. 10.1016/j.cattod.2010.04.032

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Abstract

The thermal evolution of titania-supported Au shell–Pd core bimetallic nanoparticles, prepared via colloidal routes, has been investigated by in situ XPS, DRIFTS, EXAFS andXRDand ex situHRTEM.As-prepared nanoparticles are terminated by a thin (∼5 layer) Au shell, encapsulating approximately 20nm diameter cuboctahedral palladium cores, with the ensemble stabilised by citrate ligands. The net gold composition was 40 atom%. Annealing in vacuo or under inert atmosphere rapidly pyrolyses the citrate ligands, but induces only limited Au/Pd intermixing and particle growth <300 ◦C. Higher temperatures promote more dramatic alloying, accompanied by significant sintering and surface roughening. These changes are mirrored by the nanoparticle catalysed liquid phase selective aerobic oxidation of crotyl alcohol to crotonaldehyde; palladium surface segregation enhances both activity and selectivity, with the most active surface alloy attainable containing ∼40 atom% Au.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	bimetallic ; gold ; palladium ; XPS ; oxidation ; in situ.
Publisher:	Elsevier
ISSN:	0920-5861
Last Modified:	04 Feb 2018 01:20
URI:	https://orca.cardiff.ac.uk/id/eprint/12941

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