Origin and activity of oxidized gold in water-gas-shift catalysis

As a promising route for large-scale H2 production, the water-gas-shift reaction (WGS, CO + H(2)O-->CO(2) + H(2)) on ceria-supported Au catalysts is of enormous potential in efforts to move towards a hydrogen economy. Recent research suggests that this reaction is in fact catalyzed by Au cations...

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Bibliographic Details
Published inPhysical review letters Vol. 94; no. 19; p. 196102
Main Authors Liu, Zhi-Pan, Jenkins, Stephen J, King, David A
Format Journal Article
LanguageEnglish
Published United States 20.05.2005
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Summary:As a promising route for large-scale H2 production, the water-gas-shift reaction (WGS, CO + H(2)O-->CO(2) + H(2)) on ceria-supported Au catalysts is of enormous potential in efforts to move towards a hydrogen economy. Recent research suggests that this reaction is in fact catalyzed by Au cations instead of the conventionally regarded metallic Au particles. Here density functional theory calculations demonstrate that the presence of empty localized nonbonding f states in CeO2 permits the oxidation of Au, enabling subsequent CO adsorption. A feasible reaction pathway leading to H2 production is identified, and it is concluded that four to six atom Au clusters at the O-vacancy sites of ceria catalyze the WGS reaction.
ISSN:0031-9007
DOI:10.1103/physrevlett.94.196102