TEMPERATURE-PROGRAMMED SURFACE-REACTIONS (TPSR) ON HETEROGENEOUS SURFACES

On the basis of calculations using a simple model of the energetic het erogeneity of a solid surface (assuming linear dependence of activatio n energy of desorption of the reactant on the degree of coverage), it is shown that both the degree of conversion and the course of desorpti on of the reactants are strongly influenced by the degree of heterogen eity assuming non-isothermal conditions. In contrast to a homogeneous solid surface, the degree of conversion for a heterogeneous surface de pends strongly on the initial coverage of a catalyst by reactant. Poss ibilities for kinetic evaluation are indicated from the modelling calc ulations.