Determination of Kinetic Parameters of Fischer–Tropsch Synthesis in the Presence of a Granular Cobalt Catalyst by Lilia Sineva Kirill Gryaznov Victor De Andrei Gorshkov & Vladimir Mordkovich

Author:Lilia Sineva, Kirill Gryaznov, Victor De, Andrei Gorshkov & Vladimir Mordkovich
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Tags: Some kinetic parameters of Fischer–Tropsch synthesis (FTS) were determined in the presence of a granular cobalt/zeolite catalyst. Usually, kinetic studies of granular catalysts are considered to be complicated by external and internal diffusion. We managed to obtain a catalyst with a special structure of the active surface, where sites active in FTS are isolated from each other due to the environment of inactive spinel CoAl2O4 and inter-site transport is provided by an extensive intragranular graphitic network serving simultaneously as a heat-conductive medium. As a result, FTS proceeded in the kinetic region. It was found that the reaction kinetics obey the Arrhenius law; whereas, the activation energy is different in different temperature ranges, i.e., 118.2 kJ/mol in the range of 180–210 C, and 173.6 kJ/mol in the range of 232–243 C. This behavior is determined by the presence of zeolite, which becomes active in the secondary transformations of FTS products at temperatures beyond 210 C., Fischer–Tropsch synthesis; granulated catalyst; heterogeneous catalysis; activation energy; order of reaction


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