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Planar Au/TiO2 model catalysts: fabrication, characterization and catalytic activity.

Authors
  • Eyrich, Menhild
  • Kielbassa, Stefan
  • Diemant, Thomas
  • Biskupek, Johannes
  • Kaiser, Ute
  • Wiedwald, Ulf
  • Ziemann, Paul
  • Bansmann, Joachim
Type
Published Article
Journal
ChemPhysChem
Publisher
Wiley (John Wiley & Sons)
Publication Date
May 17, 2010
Volume
11
Issue
7
Pages
1430–1437
Identifiers
DOI: 10.1002/cphc.200900942
PMID: 20379981
Source
Medline
License
Unknown

Abstract

Different types of planar Au/TiO(2) model catalysts are produced on TiO(2)(110) single-crystal substrates and thin TiO(2) films on Ru(0001) by physical vapor deposition of gold under ultrahigh-vacuum (UHV) conditions or by micelle-based chemical routes. Both the Au nanoparticles and the support are characterized by surface-science-based methods (such as atomic force microscopy and X-ray photoelectron spectroscopy) as well as by transmission electron microscopy. Finally, the activity of the model catalysts in the CO oxidation reaction is analyzed in a microflow reactor. Au/TiO(2)(110) model catalysts with a stoichiometric TiO(2)(110) support exhibit only a low catalytic activity compared to those with a reduced crystal and Au/TiO(2) model catalysts with thin TiO(2) films on Ru(0001) as a substrate. The possible influence of Ti interstitials in the reduced TiO(2)(110) substrates on the CO oxidation activity is discussed.

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