Article révisé par les pairs
| Résumé : | A series of arguments, based on experimental results concerning mainly methane and ethane, in favour of an associative mechanism of the hydrocarbon with an adsorbed H atom for the adsorption step of alkanes on metal surfaces are reviewed. The reaction scheme for the adsorption step is written: {A figure is presented} As w has a smaller value than z, a coverage function in hydrogen, of the type (1-θH)Z if the adsorption step is rate determining, or (1-θH)Z-W if the adsorption step is near to equilibrium, contributes to the kinetic equation of the catalytic reaction. Due to the large value of z (8 or more), this function contains a hydrogen pressure and a temperature dependence of the same type as measured on the rate of the catalytic reaction. It also contains a demanding character. © 1992. |
