Catalysis Letters

, Volume 141, Issue 5, pp 625–632

Catalytic CO Oxidation on Individual (110) Domains of a Polycrystalline Pt Foil: Local Reaction Kinetics by PEEM

  • Ch. Spiel
  • D. Vogel
  • Y. Suchorski
  • W. Drachsel
  • R. Schlögl
  • G. Rupprechter
Article

Abstract

The reaction kinetics of catalytic CO oxidation on individual grains of a polycrystalline Pt foil has been studied simultaneously by photoemission electron microscopy (PEEM) and mass spectroscopy (MS), in the pressure range ~10−5 mbar. By processing the video-PEEM images of ongoing catalytic reaction, the kinetic transitions were tracked for individual [110]-oriented domains. The obtained local kinetic phase diagrams were contrasted to those obtained from global MS activity measurements. These data and the observation of reaction front propagation on different Pt(110) domains indicate a quasi-independent behaviour of the crystallographic domains. The observed front propagation velocities and the degree of their anisotropy on Pt foil corroborate earlier observations on Pt(110) single crystals, confirming our concept of using Pt foil to monitor and compare different surface terminations in parallel.

Graphical Abstract

Keywords

CO oxidation Platinum Photoemission electron microscopy Mass spectroscopy Kinetic phase transitions 

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Ch. Spiel
    • 1
  • D. Vogel
    • 1
    • 2
  • Y. Suchorski
    • 1
  • W. Drachsel
    • 1
  • R. Schlögl
    • 2
  • G. Rupprechter
    • 1
  1. 1.Institute of Materials ChemistryVienna University of TechnologyViennaAustria
  2. 2.Fritz-Haber-Institut der Max-Planck-GesellschaftBerlinGermany

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