Abstract
Fischer-Tropsch synthesis, and homologation, hydrogenolysis and dimerization of various C 2, C 3, C 4 and C 5 olefins were studied on group VIII metal-based supported catalysts (essentially Ru/SiO 2). The experimental results were in favor of similar mechanisms of CC bond formation for both chain growth in Fischer-Tropsch syntheses and olefin homologation. These mechanisms could also account for CC bond cleavage in hydrocarbon hydrogenolysis. Using model elementary reaction steps of organometallic chemistry, it was possible to envisage two types of mechanism for CC bond cleavage and formation on metal catalysts: (i) a carbene insertion-deinsertion reaction to (or from) a metal-alkyl fragment or (ii) a carbene-olefin mechanism via dimetallacyclopentane intermediates. For dimerization reactions, a mechanism involving coupling of alkylidene fragments could explain the experimental results.
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