Ethylene epoxidation silver catalyst, optimal distribution

Optimal Distribution of Silver Catalyst for Epoxidation of Ethylene... 

The optimal distribution of silver catalyst in a-Al203 pellets is investigated experimentally for the ethylene epoxidation reaction network, using a novel single-pellet reactor. Previous theoretical work suggests that a Dirac-delta type distribution of the catalyst is optimal. This distribution is approximated in practice by a step-distribution of narrow width. The effect of the location and width of the active layer on the conversion of ethylene and the selectivity to ethylene oxide, for various ethylene feed concentrations and reaction temperatures, is discussed. The results clearly demonstrate that for optimum selectivity, the silver catalyst should be placed in a thin layer at the external surface of the pellet. 

K. L. Yeung, A. Gavriilidis, A. Varma, M. M. Bhasin, Effects of 1,2 dichloroethane addition on the optimal silver catalyst distribution in pellets for epoxidation of ethylene, J. Catal. 174 (1988) 1. 

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