Abstract
Krypton adsorption data for an anatase sample has been obtained at 77.5°K. Comparison has been made between the methods of Ross and Olivier and that of Adamson et al., of interpreting this data in terms of the concept of surface heterogeneity. Using the Hill-de Boer isotherm model in both cases results in comparable distributions, but not exact agreement. If, however, the Adamson method is used with the Langmuir isotherm model, a completely different distribution results, predicting higher adsorption energies. The distribution function obtained is therfore clearly dependent on the model isotherm equation adopted, and the introduction of terms into the mobile film model to account for translational energy barriers could alter the site energy distribution considerably.
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