Abstract
Primary chemistry (alkene to epoxide) and the secondary chemistry (epoxide to CO 2 + H 2 O) have been investigated on Ag (111) and (331) single crystal surfaces. The use of higher alkenes as model compounds has shown that epoxidation is indeed due to chemisorbed oxygen atoms, and that this species acts as an electrophile towards the C=C bond. The mechanistic model proposed is confirmed by examining the opposite effects on reaction selectivity which are induced by potassium and chlorine promotion. Temperature programmed reaction studies (TPR) and ultra violet photoelectron spectroscopy (UPS) data obtained with ethene epoxide and its further oxidation products suggest that isomerisation to the aldehyde is the rate determining step in the overall conversion of epoxide to CO 2 + H 2 O.
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