Influence of gold particle size on the aqueous-phase oxidation of carbon monoxide and glycerol

William C. Ketchie, Yu Lun Fang, Michael S. Wong, Mitsuhiro Murayama, Robert J. Davis

研究成果: Contribution to journalArticle査読

236 被引用数 (Scopus)


Carbon-supported Au particles with mean sizes ranging from 5 to 42 nm and unsupported Au powder were evaluated as catalysts in the aqueous-phase oxidation of CO and glycerol. For the aqueous-phase oxidation of CO at pH 14 and 300 K, the turnover frequency (TOF) for the 5-nm Au particles was 5 s-1, whereas the TOF for large supported Au (42 nm) and bulk Au were only 0.5 and 0.4 s-1, respectively. The observed rate of peroxide formation during CO oxidation also was much higher on the small Au particles. Oxidation of glycerol in the aqueous phase at 333 K and elevated pH over the same catalysts revealed a similar influence of particle size, with the 5-nm Au particles giving a TOF of 17 s-1 at pH 13.8 and the larger particles and bulk Au nearly an order of magnitude less active. However, large Au particles (>20 nm) were more selective to glyceric acid. The lower selectivity of small Au particles is attributed to a higher formation rate of H2O2 during glycerol oxidation, because peroxide promotes C{single bond}C cleavage reaction.

ジャーナルJournal of Catalysis
出版ステータス出版済み - 8 15 2007

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

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