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Carbon monoxide oxidation on copper oxide thin films supported on corrugated cerium dioxide {111} and {001} surfaces

På svenska

Author

  • Björn Skårman
  • Reine Wallenberg
  • PO Larsson
  • Arne Andersson
  • JO Bovin
  • SN Jacobsen
  • U Helmersson

Summary, in English

Thin films of CeO2 with and without a thin layer of copper oxide were prepared by rf magnetron sputtering on surfaces of alpha-Al2O3 (sapphire) substrates. Careful characterisation of the surfaces was performed down to the atomic level using high-resolution electron-microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. Surprisingly, the as-deposited, corrugated ceria surfaces, nominally (001), consist exclusively of {111}-type lattice planes, but, upon annealing at 800 degrees C, a well-defined portion of (001) surfaces are formed. Oxidation of carbon monoxide to carbon dioxide was studied, having the prepared films in a stirred batch reactor. A batch reactor was chosen so that the conversion over the small sample surface area (ca 10(-4) m(2)) could be monitored as a function of the reaction time. The activity of copper oxide on annealed ceria surfaces is markedly higher than on nonannealed surfaces, indicating a favourable synergetic effect between the ceria (001) surface and the copper oxide phase. (C) 1999 Academic Press.

Publishing year

1999

Language

English

Pages

6-15

Publication/Series

Journal of Catalysis

Volume

181

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 1090-2694