Abstract
Ethylene oxidation was investigated in a flow-type reactor, using silver catalysts supported on a series of aluminas which were pretreated at different temperatures between 300 and 1800 °C. Steady activity and selectivity at a set of reaction conditions were dependent upon the surface area of the catalyst which was a function of the thermal treatment of alumina. The specific rates of ethylene oxidation, the oxidation of ethylene oxide, ethylene oxide isomerization to acetaldehyde, and acetaldehyde oxidation were investigated in a pulse reactor, using three kinds of catalysts supported on aluminas pretreated at 1150, 1200, and 1800 °C. By comparing the activities of these catalysts for the above four reactions, the following were deduced: (1) A direct oxidation path of ethylene to carbon dioxide and water could be assumed for each catalyst; (2) the consecutive oxidation of ethylene via ethylene oxide was assumed to occur on each catalyst tested, and it predominated on catalysts supported on aluminas pretreated at lower temperatures, which was interpreted in terms of the complete oxidation of acetaldehyde formed in the pores of alumina by the isomerization of ethylene oxide.
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