Abstract
The mechanism of the reaction of oxygen with CO on Pt(111) and polycrystalline surfaces was studied at low temperatures, with reactive thermal desorption and isotope tracer techniques. Two CO 2 formation processes were observed. The first is the interaction between CO and oxygen admolecules, which takes place below 200 K. The second is the reaction of CO admolecules with oxygen adatoms. The desorption flux of the product CO 2 of both processes shows a very sharp angular distribution along the surface normal.
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