Abstract
The suggestion that two types of oxygen species are necessary for ethylene epoxidation is investigated using a model carbonsupported silver catalyst. It is established that the relative populations of the nucleophilic and electrophilic oxygen species are strnogly dependent on silver particle size, the nucleophilic oxygen only being observed for cluster sizes greater than 300Å. The observation that the two types of oxygen only co-exist on large silver particles is consistent with reported epoxidation rates for silver catalysts.
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