KINETIC MODELING OF METHANATION REACTION OVER A CO-MO SIO2 CATALYST/

The methanation kinetics of CO over a bimetallic catalyst containing 6 Co:1Mo:4K:100SiO2 has been studied and compared with that over a 6Co:4 K: 100SiO2 monometallic catalyst. Nine models arising from carbide, en olic and Eley Rideal mechanisms were considered and assessed with resp ect to the rate data obtained for each catalyst. Interestingly, all th ree models which were considered statistically adequate involved the d issociative adsorption of H2 as the rate-determining-step (RDS). The m odelling results also suggest that the introduction of Mo to Co altere d the methanation behaviour of CO over cobalt kinetically but not mech anistically.