Abstract
Single-crystal measurements show that N 2O decomposition is significantly activated on atomically clean Ag(111). The presence of preadsorbed atomic oxygen accelerates the process, as do small amounts of dissolved oxygen; larger amounts of dissolved oxygen have an opposite effect. Isotope distribution data show that the reaction tends to occur preferentially in the vicinity of preexisting surface oxygen atoms. Atomic oxygen deposited by N 2O decomposition is shown to be active for ethylene epoxidation in three different types of experiment, in each of which the effect of gaseous oxygen was negligible. These results provide strong support for the “atomic oxygen” mechanism of ethylene epoxidation.
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