Abstract: A corrected comprehensive Fischer-Tropsch synthesis kinetic model was developed on the basis of the CH2 insertion alkyl mechanism, in which readsorption and secondary reactions of olefins, alcohols, and acids and their non-intrinsic effects (diffusion, physisorption, and solubility) were involved. The values of kinetic parameters estimated by the regression between the corrected kinetic model and the data in the literature are within the ranges reported in the literature. The predicted paraffin, olefin, alcohol, and acid distributions and the corresponding olefin/hydrocarbon, alcohol/hydrocarbon, and acid/hydrocarbon ratios fit well with the experimental data. It further suggests that paraffin, olefin, alcohol, and acid formation reactions over the Fe-Mn catalyst are parallel competitive reactions. The higher constant of alcohol and acid readsorption and secondary reactions than that of olefin indicates that alcohols and acids have more propensity to readsorb over the catalyst surface and have more chances to take part in chain growth reactions and can be hydrogenated to corresponding paraffins. Diffusion effects of olefins and oxygenates with low carbon numbers on product distributions are not the dominant reason for the readsorption and secondary reactions of olefins, alcohols, and acids according to the comparison of their liquid molecular volumes and boiling points with low carbon numbers.

Key words: Fischer-Tropsch synthesis, kinetic model, product distribution, hydrocarbon, oxygenate