NEW MODEL THAT DESCRIBES ADSORPTION OF LATERALLY INTERACTING GAS-MIXTURES ON RANDOM HETEROGENEOUS SURFACES - 1 - PARAMETRIC STUDY AND CORRELATION WITH BINARY DATA

Analytic expressions for the adsorption of a binary gas mixture that l aterally interacts on a random heterogeneous surface are developed. Th e lateral interactions are of the Bragg-Williams type, and the surface heterogeneity is modeled via a random distribution of sites described by a uniform distribution of Henry's law constants. A parametric stud y shows that complex phase behavior can be predicted with this model, including azeotropes and sigmoidal-shaped x-y diagrams. This model is also successfully correlated with binary data from the literature with average relative errors of less than 10% for both single-component an d binary adsorption data.