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Communication

Engineering Pt in Ceria for a Maximum Metal−Support Interaction in Catalysis

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Connie M. Y. Yeung,^† Kai Man K. Yu,^† Qi Jia Fu,^† David Thompsett,^‡ Michael I. Petch,^‡ and Shik Chi Tsang*^†

Surface and Catalysis Research Centre, School of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, U.K., and Johnson Matthey Technology Centre, Sonning Common, Reading RG4 9NH, U.K.

J. Am. Chem. Soc., 2005, 127 (51), pp 18010–18011

DOI: 10.1021/ja056102c

Publication Date (Web): December 2, 2005

Section:

Industrial Inorganic Chemicals

Abstract

Conventional supported metal catalysts are metal nanoparticles deposited on high surface area oxide supports with a poorly defined metal−support interface. Typically, the traditionally prepared Pt/ceria catalyzes both methanation (H₂/CO to CH₄) and water−gas shift (CO/H₂O to CO₂/H₂) reactions. By using simple nanochemistry techniques, we show for the first time that Pt or PtAu metal can be created inside each CeO₂ particle with tailored dimensions. The encapsulated metal is shown to interact with the thin CeO₂ overlayer in each single particle in an optimum geometry to create a unique interface, giving high activity and excellent selectivity for the water−gas shift reaction, but is totally inert for methanation. Thus, this work clearly demonstrates the significance of nanoengineering of a single catalyst particle by a bottom-up construction approach in modern catalyst design which could enable exploitation of catalyst site differentiation, leading to new catalytic properties.

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History

Published In Issue December 28, 2005
Received September 5, 2005

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Communication

Engineering Pt in Ceria for a Maximum Metal−Support Interaction in Catalysis