Kinetic Study of Fischer Tropsch Synthesis over co Precipitated Iron-Cerium Catalyst

The kinetic of Fischer-Tropsch synthesis over a co-precipitated Fe-Ce catalyst was investigated in a fixed bed micro reactor. Experimental conditions were varied as follow: reaction pressure 1-15 bar, H2/CO feed ratio of 1-3 and space velocity of 3600-5400 h-1 at the temperature range of 270-310 °C. Four models according to the Langmuir-Hinshelwood-Hougen-Watson (LHHW) type rate equation were derived on the basis of detailed set of possible reaction mechanisms. The reaction rate of this study is fitted fairly well by one kinetic expression based on LHHW mechanism. The kinetic parameters were estimated via non-linear regression method and the MARR% values for all proposed models were obtained. The activation energy was 72 kJ mol-1 for optimum kinetic model. This model had the lower MARR% value than those of the other proposed models.