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Adsorption on Epitaxial Oxide Films as Model Systems for Heterogeneous Catalysis

  • S. Wohlrab
  • F. Winkelmann
  • J. Libuda
  • M. Bäumer
  • H. Kuhlenbeck
  • H.-J. Freund

Abstract

We have studied the interaction of Pt with Al203(lll)/NiAl(110) and the adsorption of CO on the platinum covered oxide film for different Pt coverages and deposition temperatures. At 300 K the platinum forms a twodimensional layer which is partially ordered. No order within the metal deposit could be observed for deposition at 100 K. On the Pt deposit prepared at room temperature CO dissociation occurs, in contrast to non dissociative CO adsorption on Pt single crystals. With TDS (Thermal Desorption Spectroscopy) an unusual CO desorption signal is observed at T≈ 150 K. Upon annealing at elevated temperature the Pt seems to diffuse into the oxide film or through the oxide film into the NiAl substrate.

Keywords

Oxide Film Deposition Temperature Electron Energy Loss Spectroscopy Thermal Desorption Spectroscopy Ultraviolet Photoelectron Spectroscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-verlag Berlin Heidelberg 1996

Authors and Affiliations

  • S. Wohlrab
    • 1
  • F. Winkelmann
    • 1
  • J. Libuda
    • 1
  • M. Bäumer
    • 1
  • H. Kuhlenbeck
    • 1
  • H.-J. Freund
    • 1
  1. 1.Department of Physical ChemistryRuhr-Universität BochumBochumGermany

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