The role of the carbonaceous overlayer in the competitive hydrogenation of cyclopropanes and olefins

Pálinkó, István and Notheisz, Ferenc and Bartók, Mihály (1988) The role of the carbonaceous overlayer in the competitive hydrogenation of cyclopropanes and olefins. CATALYSIS LETTERS, 1 (5). pp. 127-131. ISSN 1011-372X (print) 1572-879X (online)

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Abstract

In the competitive hydrogenation of olefin-cyclopropane mixtures (2-Me-2-butene + 1,1-diMe-cyclopropane and 2,4-diMe-2-pentene + 1,1,2,2-tetraMe-cyclopropane) over silica supported Pt, Pd and Rh catalysts at 318 K and 373 K, only the olefin is hydrogenated. The other component does not react even after the complete hydrogenation of the olefin. The olefin creates a hydrogen-rich carbonaceous overlayer which is the active phase for its hydrogenation but it is a permanent poison for the hydrogenative ring opening of the cyclopropane ring. On Ni/SiO2 at 473 K, however, such an overlayer does not form and both reactants transform in parallel in a complex way.

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