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Kinetic oscillations in the catalytic CO oxidation on Pt(100): Experiments

J. Chem. Phys. 84, 3519 (1986); doi:10.1063/1.450238

Issue Date: 15 March 1986

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R. Imbihl, M. P. Cox, and G. Ertl
Institut für Physikalische Chemie, Universität München, 8 München 2, Federal Republic of Germany
Under properly chosen conditions the rate of catalytic CO oxidation at a clean and well-defined Pt(100) surface exhibits sustained temporal oscillations which are also reflected by periodic changes of the work function (Delta[cursive phi]). These oscillations are associated with periodic changes of the surface structure between the CO-covered (thetaCO =0.5) 1×1–c(2×2) phase and an oxygen adlayer, respectively the reconstructed hex phase, as demonstrated by LEED. Laterally resolved experiments revealed that the surface phase transformations propagate in the form of trigger waves across the whole surface area. On the basis of detailed experiments and of literature data on the adsorptive properties of the two surface modifications of Pt(100) a microscopic picture on the mechanism of the observed phenomena is developed which also underlies a recently performed theoretical treatment. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 27 September 1985; accepted 19 November 1985
Permalink: http://link.aip.org/link/?JCPSA6/84/3519/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical chemistry Surface processes Heterogeneous catalysis at surfaces and other surface reactions
  • 82.65.My
    Physical chemistry Surface processes Sorption and accommodation coefficients
  • 82.20.Mj
    Physical chemistry Chemical kinetics Nonequilibrium kinetics
  • 82.65.Dp
    Physical chemistry Surface processes Thermodynamics of surfaces
  • YEAR: 1986

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (30)
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