Adsorption On Energetically And Geometrically Nonuniform Surfaces

The description of adsorption on geometrically uniform but energetically heterogeneous surfaces has been frequently discussed in the literature [60, 86]. For planar and energetically homogeneous surfaces, adsorption equilibria have been often described in terms of Equation (6.15), the BET equation, with the constant C being a function of the adsorption energy. The assumption of energetic homogeneity can be removed by considering the total measured adsorption as the sum of 'local' processes, each occurring on sites of the same adsorption energy. If these processes are independent, then the total adsorption isotherm *t(x) for any assigned surface heterogeneity is

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