Performance, structure and mechanism of Pd-Ag alloy catalyst for selective oxidation of glycerol to dihydroxyacetone

Shota Hirasawa, Hideo Watanabe, Tokushi Kizuka, Yoshinao Nakagawa, Keiichi Tomishige

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

Abstract

The mechanism of the oxidation of glycerol to dihydroxyacetone over Pd-Ag catalysts was discussed. Characterization results suggest that the metal composition of the surface of the crystalline Pd-Ag alloy particles is almost the same as the bulk composition. The synergetic effects of Pd and Ag appear on the oxidation of the secondary OH group of vic-diols. The reaction order with respect to glycerol concentration over Pd-Ag/C was zero, suggesting the strong interaction between glycerol and the catalyst surface. The reaction order with respect to O2 pressure was 0.4, suggesting that the rate-determining step is the reaction involving oxygen species. These reaction trends and characterization results support the mechanism where the terminal OH group of glycerol is adsorbed on the Ag site and the neighboring secondary OH group (CH-OH) is attacked by the oxygen species dissociatively adsorbed on the Pd site.

Original languageEnglish
Pages (from-to)205-216
Number of pages12
JournalJournal of Catalysis
Volume300
DOIs
Publication statusPublished - 2013 Apr

Keywords

  • Biomass
  • Glycerol
  • Oxidation
  • Palladium
  • Silver

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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