Abstract
The kinetics of the methanation of carbon monoxide has been investigated on an alumina-supported nickel catalyst having an average particle size of 1.2 mm. The following experimental conditions were applied: 0.001 ≤ p CO ≤ 0.6 bar, 1 ≤ p H 2 ≤ 25 bar, 453 ≤ T ≤ 557 K. The kinetics can be satisfactorily explained by assuming equilibrium of dissociative carbon monoxide and hydrogen adsorption and hydrogenation of surface carbon to a CH 2-species involving two adsorbed hydrogen atoms as the rate limiting step: r CH 4 = k CH 2 K C K H 2 P CO 0.5 p H 2 (1 + K C p CO 0.5 + K H p H 0.5 ) 3 Both the hydrogenation of the surface oxygen to water and of the CH 2-species to methane are considered to be fast processs. The formation of ethane, which occurred to a small extent, could be described by a kinetic model which tentatively postulates the dimerization of the CH 2-species to an alkyl carbenic surface species and its consecutive hydrogenation.
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