Effects of surface modifiers in the liquid-phase hydrogenation of olefins over silica-supported Pt, Pd and Rh Catalysts, 2 Thiophene and CS2

Pálinkó, István (1994) Effects of surface modifiers in the liquid-phase hydrogenation of olefins over silica-supported Pt, Pd and Rh Catalysts, 2 Thiophene and CS2. STUDIES IN SURFACE SCIENCE AND CATALYSIS, 88. pp. 603-608. ISSN 0167-2991

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Abstract

The poisoning effects of CS2 and thiophene on the hydrogenation of olefins with different structures (cyclohexene, 1-hexene) were studied over silica-supported Pt, Pd and Ph catalysts in the liquid phase, at ambient temperature. The rate of hydrogenation decreased linearly upon addition of CS2 over Pt and Pd until the reaction ceased. The hydrogenation activity of Rh/SiO2 could also be eliminated. Thiophene inhibited hydrogenation as well, however, the reaction could not be stopped. Curved activity vs apparent thiophene coverage graphs characterize the poisoning process. Carbon disulfide adsorbed over the catalysts completely, while thiophene was strongly bonded only over the most active sites.

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