On-line GC and GC–MS analyses of the Fischer–Tropsch products synthesized using ferrihydrite catalyst

Fischer–Tropsch (FT) synthesis reaction was performed using ferrihydrite catalyst. During 100 h of FT synthesis reaction, composition changes of the reaction product were studied according to the reaction time using an on-line GC, and the final FT products collected in traps were analyzed by GC–MS. Also, an effect of gas feed ratio of H2/CO on the selectivity of the synthetic products was studied. As a H2/CO feed ratio increased, not only CO conversion and activity of catalyst improved two times, but also CO2 conversion was reduced by approximately 40% thereby improving the efficiency of catalyst significantly.