A K promoted iron-manganese catalyst was prepared by sol-gel method
and subsequently was tested for hydrogenation of carbon monoxide to light olefins. The kinetic experiments on a well-characterized Fe-Mn/K/Al
2
O
3
catalyst were performed in a fixed-bed micro-reactor in a temperature range of 280-380 ℃
pressure range of 0.1-1.2 MPa
H
2
/CO feed molar ratio range of 1-2.1 and a space velocity range of 2000-7200 h
-
1
. Considering the mechanism of the process and Langmuir-Hinshelwood-Hogan-Watson (LHHW) approach
unassisted CO dissociation and H-assisted CO dissociation mechanisms were defined. The best models were obtained using non-linear regression analysis and Levenberg-Marquardt algorithm. Consequently
4 models were considered as the preferred models based on the carbide mechanism. Finally
a model was proposed as a best model that assumed the following kinetically relevant steps in the iron-Fischer-Tropsch (FT) synthesis: (1) CO dissociation occurred without hydrogen interaction and was not a rate-limiting step; (2) the first hydrogen addition to surface carbon was the rate-determining steps. The activation energy and adsorption enthal
py were calculated 40.0 and -30.2 kJ·mol
-
1
respectively.
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