Gold nanoparticles on ceria: Importance of O vacancies in the activation of gold

J. A. Rodriguez, X. Wang, P. Liu, W. Wen, J. C. Hanson, J. Hrbek, M. Pérez, J. Evans

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

Synchrotron-based techniques (high-resolution photoemission, in-situ X-ray absorption spectroscopy, and time-resolved X-ray diffraction) have been used to study the destruction of SO2 and the water-gas shift (WGS, CO + H2O → H2 + CO2) reaction on a series of gold/ceria systems. The adsorption and chemistry of SO2 was investigated on Au/CeO2(111) and AuOx/CeO2 surfaces. The heat of adsorption of the molecule on Au nanoparticles supported on stoichiometric CeO2(111) was 4-7 kcal/mol larger than on Au(111). However, there was negligible dissociation of SO2 on the Au/CeO2(111) surfaces. The full decomposition of SO2 was observed only after introducing O vacancies in the ceria support. AuOx/CeO2 surfaces were found to be much less chemically active than Au/CeO2(111) or Au/CeO2-x(111) surfaces. In a separate set of experiments, in-situ time-resolved X-ray diffraction and X-ray absorption spectroscopy were used to monitor the behavior of nanostructured {Au + AuOx}-CeO2 catalysts under the WGS reaction. At temperatures above 250

Original languageEnglish (US)
Pages (from-to)73-81
Number of pages9
JournalTopics in Catalysis
Volume44
Issue number1-2
DOIs
StatePublished - Jun 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Keywords

  • CO oxidation
  • Ceria
  • DeSO
  • Gold
  • Gold oxide
  • Hydrogen production
  • Sulfur dioxide
  • Water-gas shift

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