Predicting isotherms in micropores for different molecules and temperatures from a known isotherm by improved Horvath-Kawazoe equations |
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Authors: | Linda S Cheng Ralph T Yang |
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Institution: | (1) Department of Chemical Engineering, State University of New York at Buffalo, 14260 Buffalo, NY |
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Abstract: | Our improved Horvath-Kawazoe (H-K) equations (by considering the isotherm nonlinearity) for three pore geometries are first summarized. These equations apply to adsorption in microporous materials at subcritical temperatures. From a known isotherm at a given temperature, these equations are used to predict isotherms of the same adsorbate molecules at other temperatures, and also to predict isotherms for other adsorbate molecules at the same (or any subcritical) temperature. A reasonable agreement is obtained between predictions and experimental data. Since the H-K formulation only involves dispersion forces, it underpredicts for gas-solid systems in which other forces also exist. The N2-zeolite system is one of these systems. |
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Keywords: | micropore size distribution Horvath-Kawazoe equation isotherms from pore size distribution |
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