Synergistic effect in an Au-Ag alloy nanocatalyst: CO oxidation

Jun Hong Liu, Ai Qin Wang, Yu Shan Chi, Hong-Ping Lin, Chung Yuan Mou

Research output: Contribution to journalArticle

326 Citations (Scopus)

Abstract

Au-Ag alloy nanoparticles supported on mesoporous aluminosilicate have been prepared by one-pot synthesis using hexadecyltrimethylammonium bromide (CTAB) both as a stabilizing agent for nanoparticles and as a template for the formation of mesoporous structure. The formation of Au-Ag alloy nanoparticles was confirmed by X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, and transmission electron microscopy (TEM). Although the Au-Ag alloy nanoparticles have a larger particle size than the monometallic gold particles, they exhibited exceptionally high activity in catalysis for low-temperature CO oxidation. Even at a low temperature of 250 K, the reaction rate can reach 8.7 × 10-6 mol·gcat. -1·-1 at an Au/Ag molar ratio of 3/1. While neither monometallic Au@MCM-41 nor Ag@MCM-41 shows activity at this temperature, the Au-Ag alloy system shows a strongly synergistic effect in high catalytic activity. In this alloy system, the size effect is no longer a critical factor, whereas Ag is believed to play a key role in the activation of oxygen.

Original languageEnglish
Pages (from-to)40-43
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number1
DOIs
Publication statusPublished - 2005 Jan 13

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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