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- W2040839996 abstract "Abstract A systematic study of a set of silica supported palladium catalysts was undertaken. The catalysts were prepared by impregnation. Some of the impregnated samples were reduced isothermally, others by thermoprogramed reduction (TPR). The percentage of the exposed metal was determined both by hydrogen and CO chemisorption with the values ranging from 6% to 39% over the series. The catalysts prepared by TPR had higher dispersions and their activities were less sensitive to the final reduction temperature used in their preparation. A set of these catalysts having different reaction site densities as determined by the single turnover (STO) characterization procedure were used to catalyze the hydrogenation of 1-methyl-4-tert-butylcyclohexene (1). The correlation between these rate data and the STO saturation site densities for each catalyst provided the values for single site reactivities. The hydrogenation of 1 on palladium was found to proceed with a higher trans/cis ratio than was observed using a platinum catalyst. This was apparently due to the formation of a π-allyl absorbed intermediate in the palladium catalyzed reaction. Substrate self-inhibition behavior and non-competitive reversible inhibition by phosphine additives on the surface reactivity and stereoselectivity were also observed." @default.
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- W2040839996 date "1993-04-01" @default.
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- W2040839996 title "Correlation between the single turnover (STO) site densities and the rates of 4-tert-butyl-1-methylcyclohexene hydrogenation over silica supported palladium catalysts" @default.
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- W2040839996 doi "https://doi.org/10.1016/0304-5102(93)85003-c" @default.
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