Isotherms Based on the Ideal Adsorbed Solution Theory

3 Competitive Isotherms Based on the Ideal Adsorbed Solution Theory 

There are several methods available that allow the prediction of mixture isotherms based on general single-component information. An application can significantly reduce the necessary number of experiments. The most successful approach is the ideal adsorbed solution (IAS) theory initially developed by Myers and Prausnitz (1965) to describe competitive gas phase adsorption. This theory was subsequently extended by Radke and Prausnitz (1972) to quantify adsorption from dilute (i.e., also ideal) solutions. 

The tv o-dimensional spreading pressure jr is an intensive property of the adsorbed phase. Considering the adsorption of just a single (superscript 0) component i and respecting the Gibbs-Duhem equation provides for constant temperature and pressure and equilibrium conditions the vell-kno vn Gibbs adsorption isotherm (Myers and Prausnitz, 1965)  

In order to apply this expression, the better accessible identical chemical potentials in the fluid phase, p, , can be used to substitute the corresponding adsorbed phase chemical potentials  

Integration of the Gibbs adsorption isotherm over a mnning variable leads to 

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