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Shedding light on catalytic ignition: coverage changes during CO oxidation on Pd(110)

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Abstract

Catalytic ignition or ‘light-off’ has been studied for a reaction of importance in automobile exhaust emissions, namely, CO oxidation over Pd, a metal which has become an important component of car catalysts. We present kinetic and spectroscopic studies to show that light-off is associated with a step change in surface composition of reactants as the surface is heated. Fast XPS using synchrotron radiation of high brightness reveals that the surface is dominated by CO at low temperature and the coverage suddenly switches during light-off to an oxygen-atom-dominated situation.

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Authors and Affiliations

  1. Department of Chemistry, University of Reading, Whiteknights Park, Reading, RG6 6AD, UK

    Michael Bowker, Isabel Z. Jones & Roger A. Bennett

  2. Sincrotrone Trieste S.C.p.A., Padriciano 99, I-34012, Trieste, Italy

    F. Esch, A. Baraldi, S. Lizzit & G. Comelli

  3. Dipartimento di Fisica, Univesita di Trieste, via Valerio 2, I-34127, Trieste, Italy

    G. Comelli

Authors
  1. Michael Bowker
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  2. Isabel Z. Jones
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  3. Roger A. Bennett
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  4. F. Esch
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  5. A. Baraldi
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  6. S. Lizzit
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  7. G. Comelli
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Bowker, M., Jones, I.Z., Bennett, R.A. et al. Shedding light on catalytic ignition: coverage changes during CO oxidation on Pd(110). Catalysis Letters 51, 187–190 (1998). https://doi.org/10.1023/A:1019013807493

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