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Summary : A kinetic study for oxidation of ethylene was carried out using an integral reactor and a silver catalyst promoted by potassium sulfate under stationary state. Measurements were made under ordinary and higher pressures. Empirical rate equations were found to be:where P is the total pressure, and ki and Ci are the rate constant and mole fraction for component i, respectively.

Summary:The decrease in activity and deactivation of silver catalysts were elucidated by measurement of surface area, determination of surface residues by means of oxidative desorption andThe decrease in activity due both to sintering of silver and the formation of some oxidized state of silver diminished within the first three hours. Another factor that decreased the activity was the formation of surface residues by adsorption of ethylene oxide. The formation of surface residues and adsorption of ethylene oxide were reduced in the presence of water, carbon dioxide and excess oxygen. The analysis of n vs. pi gave some information as to the behavior of adsorption of oxygen, water and carbon dioxide on the catalyst.Based on the results, a mechanism for the stationary activity of the catalyst has been suggested.

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