Catalysis Letters

, Volume 51, Issue 3, pp 187–190

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


  • Michael Bowker
    • Department of ChemistryUniversity of Reading
  • Isabel Z. Jones
    • Department of ChemistryUniversity of Reading
  • Roger A. Bennett
    • Department of ChemistryUniversity of Reading
  • F. Esch
    • Sincrotrone Trieste S.C.p.A.
  • A. Baraldi
    • Sincrotrone Trieste S.C.p.A.
  • S. Lizzit
    • Sincrotrone Trieste S.C.p.A.
  • G. Comelli
    • Sincrotrone Trieste S.C.p.A.
    • Dipartimento di FisicaUnivesita di Trieste

DOI: 10.1023/A:1019013807493

Cite this article as:
Bowker, M., Jones, I.Z., Bennett, R.A. et al. Catalysis Letters (1998) 51: 187. doi:10.1023/A:1019013807493


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.

carbon monoxidelight-offmolecular beamoxygenPd(110)synchrotron radiationXPS

Copyright information

© Kluwer Academic Publishers 1998