| Abstract: | The FTS/WGS over precipitated Fe/Cu/K catalyst could be approximated as a single reaction that forms an average hydrocarbon product (CnHm) with water and carbon dioxide as its by-products. It is generally assumed that the catalyst pores are filled with liquid wax produced during the synthesis, and thus, diffusivity in wax is much less than that in gas phase. Based on the intrinsic kinetics which accounts for water inhibition, as well as reaction diffusion model and single-reaction stoichiometry, effectiveness factors were calculated by assuming different sets of stoichiometric coefficients. Reasonable calculation procedure was established for the investigated catalyst. It was found that the effectiveness factors for gas/liquid system were about half of that for gas phase, which was expected as the diffusivities. |
