Fractional site occupancy, adsorption

The quantitative measure of the degree of surface heterogeneity in the model of the one-site-occupancy adsorption is the differential distribution of the fraction of surface sites among corresponding values of adsorption energy e, x(e), such that... 

Multisite-occupancy adsorption is described as a Quantum Fractional Statistic problem. Site exclusion is characterized by statistical exclusion parameter g which relates to the molecular size and lattice geometry. The adsorption isotherm is obtained and comparisons with computer experiments indicate that adsorption configuration and lateral interactions may accurately be assessed fix>m this theory. 

Heterogeneous gas-solid surface adsorption reaction processes can frequently be treated using the same reaction rate law approach used for homogeneous chemical reactions. In such cases, surface sites are often a key reactant, and their concentration is often represented in terms of a fractional occupancy or availability [e.g., O or (1 - O)]. Using these principles, as an example, the rate at which a Pt surface is poisoned by CO gas adsorption can be modeled as 4> = 1 - (1 - 3>o)c where O is the fraction of the Pt surface that is poisoned... 

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