HYDROGENATION OF CARBONACEOUS ADSORBED SPECIES ON AN IRON ALUMINA CATALYST .2. EXPERIMENTS AND INTERPRETATION OF THE TEMPERATURE-PROGRAMMED HYDROGENATION BY A KINETIC-MODEL

A kinetic model for the hydrogenation (into CH4) of adsorbed carbonaceous species formed on an iron catalyst during the CO/H2 reaction has been previously proposed to interpret the isothermal hydrogenation. The same model is now shown to fit the experimental data obtained in the temperature-programmed hydrogenation (nonisothermal). The effect of various kinetic parameters acting during the temperature-programmed hydrogenation is included in the kinetic equation, and the main experimental observations are explained. The values of the activation energy of hydrogenation of the various adsorbed species are obtained from the kinetic equation and are compared with those found under isothermal conditions. © 1990.