Abstract
Statistical calculations have been made for the adsorption of ammonia on alumina in the region of fixed adsorption. There is a broad distribution of adsorption energies, and an expression for this distribution has been derived. Adsorption data fit the integral form of the Langmuir equation. Configurational entropies have been shown to be several-fold less than those for uniform sites. Evidence is given which indicates that the changes in vibrational entropies of adsorbent and adsorbate as a result of perturbations caused by adsorption are small. Below a coverage of 0.36 × 10 14 molecules/cm 2, adsorbed ammonia molecules have lost all translation and rotation. Above this value, it is possible that one degree of rotational freedom may have been regained.
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