ADSORPTION HEATS AND STICKING PROBABILITIES FOR CO ON POTASSIUM-PREDOSEDNi{110}

C.E. Wartnaby, J.T. Stuckless and D.A. King
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C.E. Wartnaby: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
J.T. Stuckless: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
D.A. King: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 689-692

Abstract: Simultaneously measured sticking probability and heat of adsorption data are presented for the initial reaction of CO with potassium-precovered Ni{110}. Two distinct regimes are observed which correspond with the potassium-affected structure of the surface: for less than 0.35 ML of potassium, the nickel substrate undergoes a missing-row reconstruction, while above this coverage the reconstruction is lifted. On the missing-row structure, the CO sticking probability remains high and the heat of adsorption is increased by only40 kJmol–1compared with the clean surface value, to170kJ mol–1. On the high potassium coverage structure, the CO sticking probability is dramatically reduced but the CO heat of adsorption is further increased to250kJ mol–1.

Date: 1994
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DOI: 10.1142/S0218625X94000953

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