Hydrogen pressure dependence in the ring opening of methyloxirane over silica-supported Pd and Rh catalysts: Effect of high temperature on ring-opening routes

Pálinkó, István and Ocsko, J. (1996) Hydrogen pressure dependence in the ring opening of methyloxirane over silica-supported Pd and Rh catalysts: Effect of high temperature on ring-opening routes. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 104 (3). pp. 261-265. ISSN 1381-1169

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Abstract

The high-temperature ring-opening reactions of methyloxirane were investigated with or without added hydrogen over silica-supported Pd and Rh catalysts. Without added hydrogen, mainly isomerization occurred, giving acetone through the rupture of the sterically less hindered C-O bond (route b). With added hydrogen, hydrogenative ring opening also took place and the sterically more hindered C-O bond was broken as well (route a). At 473 K allyl alcohol was formed too: a product not found at lower temperatures. Since route a was predominant over both catalysts, a bifunctional mechanism had to be considered. It is known that methyloxirane adsorbs irreversibly, therefore the shape of product formation rate vs. hydrogen pressure curves could be used for mechanistic considerations.

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