AVS 47th International Symposium
    Surface Science Thursday Sessions
       Session SS2+VT-ThM

Paper SS2+VT-ThM8
Wet Oxidation of CO on Pt(111)

Thursday, October 5, 2000, 10:40 am, Room 209

Session: Adsorption and Desorption Phenomena II
Presenter: J. Bergeld, Chalmers University of Technology and Göteborg University, Sweden
Authors: J. Bergeld, Chalmers University of Technology and Göteborg University, Sweden
D.V. Chakarov, Chalmers University of Technology and Göteborg University, Sweden
B. Kasemo, Chalmers University of Technology and Göteborg University, Sweden
Correspondent: Click to Email
Presence of small amounts of OH is found to initiate the CO oxidation on Pt(111) surface. We have studied water coadsorption with CO on atomic oxygen precovered platinum surface with temperature programmed desorption (TPD) and found distinct relationship between the low temperature, @beta@@sub 3@ peak intensity and the presence and amount of coadsorbed OH. High initial CO coverage is another prerequisite for the low temperature start of the reaction. We are proposing and discussing several feasible mechanisms of the phenomenon, giving preference to autocatalytic reaction between CO and OH at the boundaries of ordered CO and oxygen/hydroxyl islands.