Kinetics of activated chemisorption. Part 4.—Differential heat of adsorption

Abstract

A model previously applied to the kinetics of chemisorption and to adsorption at true and apparent equilibrium, is applied to the differential heats of adsorption. The measurable function, heat-coverage, differs from the enthalpy against site distribution. When the differential heat of adsorption is measured continuously, at constant pressure and increasing time, it increases with coverage. When it is measured stagewise with stages at increasing pressures, it decreases with coverage. In both cases it increases with temperature.