Elsevier

Surface Science

Volume 180, Issue 1, 1 February 1987, Pages 153-168
Surface Science

Methanation on Rh surfaces at low pressure and low temperature: A pulsed-laser imaging atom-probe study

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Abstract

We have successfully detected methanation on Rh surfaces at low pressure (∼10−8 Torr) and low temperature (150 K) using pulsed-laser imaging atom-probe. Thus it is possible to observe directly the reaction intermediates in a time-of-flight mass spectrum and study the atomic steps of such reaction. We find direct evidence of dissociative chemisorption of CO on Rh surfaces and show that under the conditions of our experiment, a dissociative mechanism is responsible for methanation on Rh surfaces. We have also observed an oscillation in signal intensity of CO+ and that of methanation products with a time period of ∼ 8 s under the conditions of that experiment.

References (23)

  • M.A. Vannice

    J. Catalysis

    (1975)
    M.A. Vannice

    J. Catalysis

    (1975)

    J. Catalysis

    (1977)
  • M.A. Vannice

    Catalysis Rev. Sci. Eng.

    (1976)
  • J.E. Crowell et al.

    Appl. Surface. Sci.

    (1986)
  • F. Solymosi et al.

    Surface Sci.

    (1981)
  • D.G. Carstner et al.

    Surface Sci.

    (1981)
  • J.T. Yates et al.

    Surface Sci.

    (1980)

    Surface Sci.

    (1982)
  • G. Wedler et al.

    Appl. Surface Sci.

    (1978)
  • C.F. Ai et al.

    Surface Sci.

    (1984)

    J. Chem. Phys.

    (1984)
  • W. Liu et al.

    Surface Sci.

    (1985)
  • W. Liu et al.

    Surface Sci.

    (1986)
  • B.E. Nieuwenhuys

    Surface Sci.

    (1983)
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