The formation of carbonaceous layer from ethylene over various transition metal catalysts – an FT-IR study

Szilágyi, Bálint and Kiss T., János and Pálinkó, István (2006) The formation of carbonaceous layer from ethylene over various transition metal catalysts – an FT-IR study. In: Sampling catalysis research in the Pannonian region: proceedings of the 8th Pannonian International Catalysis Symposium. Hungarian Zeolite Association, Szeged, pp. 19-24. ISBN 963-06-0138-9

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Abstract

The ethylene-derived carbonaceous overlayers were studied over silica-supported Pt, Pd, Rh and Cu catalysts by FT-IR spectroscopy under desorption conditions. As a general feature it was observed over all catalysts that upon increasing the desorption temperature the overlayer gradually became poor in hydrogen. The structure of the overlayers was similar over the silica-supported Pt, Pd and Rh. On increasing the reaction temperature the σ-adsorbed half-hydrogenated species are transformed to adsorbed ethylidyne. On the Cu catalyst prepared with ion exchange a similar picture emerged, while on those prepared with precipitation ethylidyne soon became the predominant species. Hydrogen swept off the carbonaceous species from the transition metals, however, copper retained large portions of it.

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