Structural changes of Au-Cu bimetallic catalysts in CO oxidation: In situ XRD, EPR, XANES, and FT-IR characterizations

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

Research output: Contribution to journalArticlepeer-review

233 Citations (Scopus)

Abstract

Au-Cu bimetallic nanoparticles supported on SBA-15 have been reported to be much more active in CO oxidation than the corresponding monometallic counterparts in our previous work. In this work, in situ techniques including XRD, EPR, XANES, and FT-IR were employed to reveal the structural changes of the Au-Cu bimetallic particles during different pretreatment and reaction conditions, and to clarify the essence of the synergistic effect between gold and copper. The results showed that gold remained as Au0 in any treatment conditions, while copper was very sensitive to the treatment temperature and atmosphere. The freshly reduced catalyst was a mixture of Au3Cu1 intermetallic phase and Cu2O amorphous phase. In CO oxidation, the Au3Cu1 intermetallic phase was segregated into a gold core decorated with tiny CuOx patches, and CO adsorbed on Au0 reacted with active oxygen provided by the neighboring CuOx, thus enhancing greatly the activity for CO oxidation.

Original languageEnglish
Pages (from-to)288-296
Number of pages9
JournalJournal of Catalysis
Volume278
Issue number2
DOIs
Publication statusPublished - Mar 7 2011
Externally publishedYes

Keywords

  • Bimetallic
  • CO oxidation
  • Copper
  • EPR
  • FT-IR
  • Gold
  • In situ XRD
  • XANES

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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