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Thermodynamical Correctness of Gas/Solid Adsorption Isotherm Equations

✍ Scribed by József Tóth

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
176 KB
Volume
163
Category
Article
ISSN
0021-9797

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✦ Synopsis

Based on a modified form of the Gibbs equation, two conditions of thermodynamical correctness have been defined. According to these conditions the change in the free energy of the surface-calculable from all isotherm equations-must have finite limiting values at (\theta \rightarrow 0) and (\theta \rightarrow 1). It has been proved that most of the known and widely used isotherm equations are, from a thermodynamic standpoint, incorrect. These incorrect relationships can be transformed into correct ones with the help of a differential equation including the change in the relative free energy of the surface. The transformation mentioned above modifies the original physical models of physical adsorption.

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