Effects of operating conditions on selectivity of Fe-Co-Mn/MgO at high temperature CO hydrogenation

The effects of process conditions such as temperature, pressure, and H-2/CO ratio on Fischer-Tropsch product selectivity were studied using a statistical model based on experimental data. The operating conditions were: T=673-721 K, P = 1-7 bar, and H-2/CO = 0.43-2.33. With the help of collected data which were obtained from a packed bed micro reactor, a statistical model was developed to investigate the effects of above operating conditions on selectivity of methane, alkanes, and alkenes. A three metallic catalyst, Fe-Co-Mn/Mg, was used to carry out the experiments. It was concluded that increase in H-2/CO ratio raises alkenes selectivity and diminishes methane and alkanes selectivity. Likewise, temperature and pressure fluctuations vary product distribution. So that optimization must be done to illustrate the optimum conditions. It was obtained that maximum amount of alkenes and minimum amount of methane and alkanes (except methane) was achieved in T = 673 K, P = 1 bar, and H-2/CO = 2.33. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.