Fundamental hypothesis of Temkin theory

The model of the non-uniform surface is that of a collection of micro-area, ensembles Ej of cataljdic active sites with identical thermodynamic and kinetic properties in each ensemble, as shown in Fig. 2.25. Each ensemble has uniform surface and contains dS- sites per cm. The distribution of active sites on catalyst surface is 

The total reaction rate is the sum of the partial reaction rates on each ensemble, with the assumption of a continuous distribution of the reaction rate. We write  

For each ensemble, we can write the value of vtj for a two-step catalytic reaction sequence  

Equation (2.120) can be obtained directly by means of the quasi-steady state approximation  

26 Relation of Polanyi. Ea activation barrier AH Enthalpy of reaction 

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