The objective of this paper is to establish a kinetic model description of CO conversion over the ultrafine particle Fe-Mn commercial catalyst in the Fischer-Tropsch process to provide the design basis for scaling up commercial reactor.Fischer-Tropsch process

including hundreds of reactions

was lumped into two kinds of reactions.One was Fischer-Tropsch reaction

in which the main product hydrocarbons were formed.The other was Water Gas Shift (WGS)reaction

in which the main by-product CO2 was formed. Thus

the reaction rate of CO was approximately expressed as the sum of hydrocarbon formation rate and CO2 formation rate.The description of the elementary step in the hydrocarbon formation was established based on the carbide mechanism.The rate-controlling step in the hydrocarbon formation model was the one controlling the formation of the structure unit CH*2. Meanwhile

the description of the elementary step in Water Gas Shift reaction was found based on the formate mechanism

and the rate-controlling step in Water Gas Shift reaction model was the formation of formate species.The kinetic model description of the Fischer-Tropsch process

including both Fischer-Tropsch reaction and Water Gas Shift reaction

was acquired by the combination of the above two kinds of kinetic models.