Synthesis of Au–Ag alloy nanoparticles supported on silica gel via galvanic replacement reaction

Xiaoyan Liu, Aiqin Wang, Lin Li, Tao Zhang, Chung Yuan Mou, Jyh Fu Lee

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Synthesis of supported Au–Ag bimetallic has attracted much attention since we found for the first time that Au and Ag had synergistic effect on CO oxidation and preferential CO oxidation in rich hydrogen. In this work, the formation of Au–Ag alloy nanoparticles supported on silica gel by galvanic replacement reaction has been investigated. We applied various characterizations including X-ray diffraction (XRD), transmission electronic microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), X-ray absorption spectroscopy (XAS) to characterize the formation process of Au–Ag alloy. Although the average particle sizes of the Au–Ag alloy nanoparticles obtained by the galvanic replacement reaction are relatively large comparing with that of loading Au first, the catalytic activity of the catalyst in preferential CO oxidation is almost the same. This result manifested that the particle size effect of Au–Ag nanoparticles was not as tremendous as that of monometallic gold. The formation of Au–Ag alloy made it less sensitive to the particle size.

Original languageEnglish
Pages (from-to)317-325
Number of pages9
JournalProgress in Natural Science: Materials International
Volume23
Issue number3
DOIs
Publication statusPublished - Jun 2013
Externally publishedYes

Keywords

  • Alloy
  • Galvanic replacement reaction
  • Gold
  • Silver
  • XAS

ASJC Scopus subject areas

  • Materials Science(all)

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