Abstract
14C-Ethylene and tritium tracer studies of the nature and reactivity of adsorbed species have been made using 5% alumina-supported palladium, rhodium, and platinum catalysts in a microcatalytic reactor between 20 ° and 200 °C. The injection of 14C-ethylene onto freshly reduced catalysts results in the formation of a strongly adsorbed species which is inactive in molecular exchange, hydrogenation, and displacement by acetylene. Using tritium, the relative abilities of the metals to promote ethylene self-hydrogenation have been determined to be Rh > Pt > Pd. The results show that the same catalyst surface exhibits different degrees of surface heterogeneity for different hydrocarbon molecules. The role of the catalyst support is also discussed, and evidence for the participation of the hydroxyl groups of the alumina in the reaction is described.
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