Addressing spreading pressure dependence of real adsorbed solution theory with generalized Langmuir isotherm

Abstract

This work addresses spreading pressure dependence of Real Adsorbed Solution Theory (RAST) for mixed-gas adsorption equilibria using generalized Langmuir (gL) isotherm. Considering vacant sites as an integral part of competitive multicomponent adsorption on a constant adsorbent surface area, the gL isotherm properly accounts for surface heterogeneity and loading, adsorbate composition, and temperature dependence. We show the spreading pressure dependence of adsorbate activity coefficient expression in the RAST framework can be generated from the gL isotherm. The procedure is illustrated with a spreading pressure dependent adsorption Nonrandom Two-Liquid activity coefficient model, and the results are validated for ten binary mixed-gas adsorption equilibria systems including two highly nonideal azeotropic systems.

Description
Under embargo until 24 October 2024. This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10450-023-00414-x
Keywords
Adsorption Nonrandom Two-Liquid Model, Generalized Langmuir Isotherm, Mixed-Gas Adsorption Equilibria, Real Adsorbed Solution Theory, Spreading Pressure Dependence
Citation
Vyawahare, P., Hamid, U., Sees, M.D. et al. Addressing spreading pressure dependence of real adsorbed solution theory with generalized Langmuir isotherm. Adsorption 29, 401–410 (2023). https://doi.org/10.1007/s10450-023-00414-x
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