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>Accumulation of liquid hydrocarbons during cobalt-catalyzed Fischer-Tropsch synthesis-influence of activity and chain growth probability
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Accumulation of liquid hydrocarbons during cobalt-catalyzed Fischer-Tropsch synthesis-influence of activity and chain growth probability
During Fischer-Tropsch (FT) synthesis higher liquid hydrocarbons accumulate in the catalyst pores. The resulting mass transport limitations may lead to a decrease in reaction rate and also an unwanted higher methane formation, particularly for catalysts of mm-size as used in fixed bed reactors. The time required for complete pore filling and to reach steady state conditions, respectively, depends on the activity, chain growth probability alpha and pore structure (pore radii distribution) of the catalyst. The pore filling process was investigated in a magnetic suspension balance for two catalysts with a high and low alpha-value, Co/Al2O3 (alpha = 0.89) and Co/SiO2 (0.64). The resulting filling times are significantly different, two days for alpha = 0.89 and more than 400 days for alpha = 0.64. The modelling of the pore filling process is in good agreement with the experimental data. Therefore, the model was also utilized to predict the general influence of activity and alpha-value on the pore filling time of a FT catalyst.
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