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, Tatsuya Tsukuda

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

A set of nearly monodisperse Au-Ag alloy clusters (size range 1.6-2.2 nm) with various Ag content (5-30%) 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 (<10%) were larger than those of monometallic Au:PVP clusters of comparable size. The enhancement of the catalytic activity by Ag doping is discussed in light of the electronic structure of the Au-Ag cores probed by X-ray photoelectron spectroscopy. The present results indicate that the partial anionic character of the Au core is important for the aerobic oxidation reactions of Au:PVP clusters.

Original languageEnglish
Pages (from-to)4885-4888
Number of pages4
JournalJournal of Physical Chemistry C
Volume111
Issue number13
DOIs
Publication statusPublished - 2007 Apr 5
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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