EXAFS and IR Study of the CO-Adsorption-Induced Morphology Change in Ru Catalysts

Takanori Mizushima, Kazuyuki Tohji, Yasuo Udagawa, Akifumi Ueno

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

EXAFS (extended X-ray absorption fine structure) and IR studies were performed on Ru catalysts supported on γ-Al2O3, MgO, SiO2, and Ti02 to elucidate the mechanism of the CO adsorption-induced disruption of metal clusters. EXAFS results show that after reduction, Ru atoms exist on all supports as small metal clusters, but the particle sizes and metal-support interactions vary with the support. CO adsorption onto Ru/γ-Al2O3 and Ru/MgO led to the disruption of Ru-Ru bonds. By comparing with IR spectroscopic observations it is concluded that new species like O-Ru-CO and O-Ru-(CO)2 on γ-Al2O3 and On-Ru-CO and (On-Ru)2-CO(n = 3, 4) on MgO are formed after CO admission. On the other hand, no evidence of disruption of Ru clusters by CO adsorption was obtained in Ru/SiO2 and Ru/TiO2. The IR study showed, contrary to previously proposed models, that no H2 evolution takes place during the CO adsorption-induced disruption. A new reaction scheme that is consistent with our observations is presented.

Original languageEnglish
Pages (from-to)7887-7893
Number of pages7
JournalJournal of the American Chemical Society
Volume112
Issue number22
DOIs
Publication statusPublished - 1990 Mar
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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