A hybrid kinetics integrating feed-consumption rate and product selectivity models for Fischer-Tropsch synthesis over an industrial cobalt-based catalyst

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Intrinsic kinetic experiments were performed in a wide range of process conditions over an industrial Fischer-Tropsch Synthesis (FTS) cobalt-based catalyst to obtain the kinetic models, aiming at the process/engineering design and the elucidation of the reaction mechanism. A hybrid kinetic model including the CO consumption model based on the Langmuir Hinshelwood Hougen Watson (LHHW) reaction mechanism and the lump-type product distribution model-C19+ selectivity model was developed. The obtained model, through parameters’ evaluation and optimization, could provide an excellent prediction of CO conversion and C19+ selectivity in a wide process condition range. Furthermore, it was inferred that CO activation follows direct dissociation mechanism with the hydrogenation of the dissociated C* and O* to CH* and OH* respectively as the rate determining step; and the activation energy for CO consumption rate model was obtained as 80.26 kJ mol−1.