KINETICS OF ISOMERIZATION OF BUTENES OVER AN INDUSTRIAL COO-MOO3/AL2O3 CATALYST .2. KINETIC-MODEL CONSTRUCTION

The kinetics of isomerization of butenes over an industrial CoO-MoO//3/Al//2O//3 catalyst have been studied by the flow-circulation method under steady state conditions, at atmospheric pressure and in the temperature interval 325-425 degree C. As a result of the study a kinetic model is proposed for the reduced form of the catalyst. The kinetic model is of the Langmuir-Hinshelwood type and corresponds to a single site mechanism. The adsorption and desorption of the three isomers, 1-butene, cis-2-butene and trans-2-butene are fast steps at equilibrium under these experimental conditions. The rate-limiting step is a surface reaction. The kinetic constants of the model provide a possibility to evaluate the rate constants of the surface interactions.