Abstract
The hydrogenation of ethylene over chromia–alumina catalysts containing known amounts of Cr2+ and Cr3+ has been investigated at temperatures between – 78 and 200 °C. The activity of the catalyst depends strongly on the presence of Cr3+(determined by e.s.r.), in as much as increasing Cr3+ concentration is accompanied by a considerable increase in the rate of hydrogenation. Preliminary kinetic studies show that the reaction rate is zeroth order in hydrogen at –78 °C and first order at higher temperatures (> 0 °C). The e.s.r. signal ascribed to Cr3+(g= 1.986) undergoes some changes under the reaction conditions when exposed to a 1 : 1 mixture of hydrogen and ethylene at 100 °C.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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