AN APPROACH TO THE MECHANISMS OF C-C BOND FORMATION AND CLEAVAGE ON METAL-SURFACES USING MODEL ELEMENTARY REACTION STEPS OF ORGANOMETALLIC CHEMISTRY

被引：16

作者：

LECONTE, M

机构：

来源：

JOURNAL OF MOLECULAR CATALYSIS | 1994年 / 86卷 / 1-3期

关键词：

C-C BOND FORMATION CLEAVAGE; FISCHER-TROPSCH SYNTHESIS; METAL SURFACES; RUTHENIUM; SILICA;

D O I：

10.1016/0304-5102(93)E0154-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fischer-Tropsch synthesis, and homologation, hydrogenolysis and dimerization of various C2, C3, C4 and C5 olefins were studied on group VIII metal-based supported catalysts (essentially Ru/SiO2). The experimental results were in favor of similar mechanisms of C-C bond formation for both chain growth in Fischer-Tropsch syntheses and olefin homologation. These mechanisms could also account for C-C bond cleavage in hydrocarbon hydrogenolysis. Using model elementary reaction steps of organometallic chemistry, it was possible to envisage two types of mechanism for C-C 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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页码：205 / 220

页数：16

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