Elsevier

Surface Science

Volume 245, Issue 3, 2 April 1991, Pages 289-304
Surface Science

Spectroscopic study of K-induced activation of CO2 on Pt(111)

https://doi.org/10.1016/0039-6028(91)90031-MGet rights and content

Abstract

The adsorption of CO2 on clean, oxygen-predosed, K-dosed, and oxygen- and potassium-covered Pt(111) was studied by high-resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy (TPD) and Auger electron spectroscopy (AES). No CO2 adsorbed on clean or oxygen-predosed Pt(111) at 112 K. However, with preadsorbed potassium the surface actively adsorbed CO2 in two forms, CO2 and weakly held molecular CO2. They were characterized at both low and high K coverages. For all K coverages, the weakly held CO2 desorbed around 150 K. At low coverages (e.g. θK = 0.16 ML), CO2 dissociated into CO(a) and O(a), and the resulting CO desorbed above 500 K. At higher coverages (e.g. θK = 0.49 ML), CO2 disproportionated into CO22−(a) and CO(a), both CO and CO2 desorbed above 600 K, and carbonate decomposed above 650 K. Although CO2 formed in cases involving preadsorbed oxygen, it readily reacted with surface oxygen to form carbonate. Possible mechanisms are discussed.

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  • Cited by (0)

    1

    Fulbright Scholar. Permanent address: Reaction Kinetics Research Group of the Hungarian Academy of Science and Institute of Solid State and Radiochemistry, University of Szeged, Hungary.

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