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2007, 111, 4885-4888 Published on Web 03/09/2007
Effect of Ag-Doping on the Catalytic Activity of Polymer-Stabilized Au Clusters in Aerobic Oxidation of Alcohol Nirmalya K. Chaki,† Hironori Tsunoyama,† Yuichi Negishi,† Hidehiro Sakurai,† and Tatsuya Tsukuda*,†,‡ Research Center for Molecular-Scale Nanoscience, Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan, and CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan ReceiVed: January 30, 2007; In Final Form: February 22, 2007
A set of nearly monodisperse Au-Ag alloy clusters (size range 1.6-2.2 nm) with various Ag content (530%) was prepared by the co-reduction method in the presence of poly(N-vinyl-2-pyrrolidone) (PVP). The catalytic activities of the Au-Ag:PVP clusters were investigated for aerobic oxidation of p-hydroxybenzyl alcohol as a model reaction to understand the effect of Ag on the catalytic activity of Au clusters. It was found that the rate constants per unit surface area for Au-Ag:PVP clusters with small Ag content (
