Modelling of the kinetics of a gas–solid reaction involving a surface transient

Abstract

A kinetic model for adsorption at solid surfaces via surface transient formation is presented. In the case of ideal adsorption where the rate constants are independent of the surface coverages, the kinetics are exactly solved in the framework of the first-order kinetic law. The expression of the sticking coefficient for the final chemisorbed state is obtained in terms of the rate constants introduced in the model. Experimental data on oxygen chemisorption at the Zn(0001) surface and of CO₂ adsorption at the MgO(100) surface have been fitted satisfactorily to model kinetics.