(733h) Isosteric Heat of Adsorption of Pure Component and Mixed-Gas Adsorption from Generalized Langmuir Isotherm

Accurate estimation of isosteric heat of adsorption is critical for the rigorous simulation and design of adsorption processes. The strong surface loading dependency in isosteric heat of adsorption in heterogeneous adsorbents has been overlooked due to challenging experimental measurements and thermodynamically inconsistent models. In this work, we utilized generalized Langmuir isotherm coupled with Clausius-Clapeyron equation to reliably represent the isosteric heat of adsorption as a function of surface loading. The model results are validated with experimental data for pure component and mixed-gas adsorption for a wide range of temperatures. For pure component adsorption, the generalized Langmuir isotherm estimations are further compared against classical Langmuir, Toth, and dual-site Langmuir isotherms. Additionally, for mixed-gas adsorption systems, the estimations are compared against the ideal adsorbed solution theory and extended Langmuir isotherm.