On the Use of the Dual Process Langmuir Model for Predicting Unary and Binary Isosteric Heats of Adsorption

摘要

Analytic expressions for unary and binary isosteric heats ofnadsorption as a function of the adsorbed phase loading were derived from thendual process Langmuir (DPL) model using the Clausius−Clapeyron equation.nUnary isosteric heats of adsorption predicted from these expressions for severalnadsorbate−adsorbent systems were compared to values in the literature predictednfrom the well-accepted graphical approach using Toth and unilan modelsn(Adsorption Equilibrium Data Handbook; Prentice Hall: NJ, 1989). Predictionsnfrom the DPL model were also compared to rare experimental unary and binarynisosteric heats of adsorption in the literature for another adsorbate−adsorbentnsystem. In all cases, very good agreement was obtained, showing that the DPLnmodel can be used in adsorption process modeling for accurately predicting notnonly ideal and nonideal mixed-gas adsorption equilibria (Langmuir 2011, 27, 4700),nbut also unary and even binary isosteric heats of adsorption.