Abstract
An extraordinarily long-induction period has been observed in the oxidation of ethylene over a silver catalyst used in the oxidation of acetaldehyde at 130–180 °C. It is found that the induction period is caused by the existence of stable adsorbed intermediates which are formed in aldehyde oxidation. The nature and the reactivity of the intermediates show the same behavior as the reaction intermediates in the oxidation of ethylene, suggesting common intermediates in both reactions. The intermediates react with H 2 to form acetic acid and ethyl alcohol, and are decomposed into CO 2 and H 2O by the reaction with oxygen. The surface coverage of all the intermediates is estimated to be from 0.73 to 1.46 depending on the gas composition and the reaction time in acetaldehyde oxidation, suggesting their multilayer adsorption. It has been confirmed that the intermediates have a similar nature and reactivity to solid silver acetate, indicating a silver acetate form as one species of the intermediates.
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