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Gas Adsorption Equilibria pp 359–413Cite as

Adsorption Isotherms

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Abstract

A short overview of adsorption isotherms often used (i) to correlate adsorption equilibria data for sorbent materials characterization and (ii) for design of industrial gas adsorption processes is given. The basic types of adsorption isotherms observed experimentally are discussed in brief. The Langmuir adsorption isotherm (LAI) and certain of its extensions to (energetically) heterogeneous sorbent materials and to admolecules with interactions are presented (Sect. 2). Several empirical isotherms used for micro- and mesoporous materials showing pore condensation are discussed in Sect. 3 briefly. In Sect. 4 an outline of thermodynamics of adsorbate phases of fractal dimension is given. Several isotherms are presented which are generalizations of well-known isotherms (Langmuir, BET, etc.) to multicomponent adsorbates on heterogeneous surfaces. These isotherms are solutions of Maxwell’s relations of the underlying Gibbs fundamental equation of the adsorbed phase. List of symbols.

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(2005). Adsorption Isotherms. In: Gas Adsorption Equilibria. Springer, Boston, MA. https://doi.org/10.1007/0-387-23598-1_8

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