Abstract
Integral molar heats and entropies of adsorbed methane and propane on rutile have been computed from data of isotherms at 103.2 ° and 110.2°K. for methane and 166.3° and 224.6°K. for propane. Some resemblance has been found between these functions and those for argon, nitrogen, and oxygen adsorbed on rutile, reported by Drain and Morrison. The integral molar entropy of adsorption made possible a test of the model of a localized film without interactions on a heterogeneous substrate. The model was found to be a reasonable representation of the state of adsorbed methane up to about 0.5 of the monolayer and of propane up to about 0.3 of the monolayer. A unique heat of adsorption curve for the adsorption of methane, ethane, propane, and n-butane has been derived and its significance is briefly discussed. The curve has been employed to derive functions for the distribution of energies among the adsorption sites of the substrate.
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