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| - Catalyst Particle Size of Cobalt/Rhenium on Porous Alumina and the Effect onFischer−Tropsch Catalytic Performance
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| - This paper addresses the effect of catalyst particle size distributions on Fischer−Tropsch catalytic performancefor cobalt catalysts promoted by rhenium on alumina or modified alumina as catalyst support. The catalystparticle size will affect diffusion of reactants as well as of products. Some key findings are that the C5+selectivity is rather constant for particle sizes up to ca. 400 μm and that the selectivity reduction thereafteris largely explained by an increase in the methane yield as the effective H2/CO ratio increases. In the wholerange of particle sizes investigated, the olefin to paraffin ratio of the light products decreases linearly as thediffusion length becomes longer. Moreover, this ratio is the same for all catalysts in spite of a large variationin selectivity to higher hydrocarbons. It follows that readsorption of olefins and continued chain growth onlyplays a minor role. The roles of added water and conversion level are also discussed.
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