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| - A Heterogeneous Model for Gas Transport in CarbonMolecular Sieves
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| - A dual resistance model with distribution of either barrier or pore diffusional activation energy is proposedin this work for gas transport in carbon molecular sieve (CMS) micropores. This is a novel approach inwhich the equilibrium is homogeneous, but the kinetics is heterogeneous. The model seems to provide apossible explanation for the concentration dependence of the thermodynamically corrected barrier andpore diffusion coefficients observed in previous studies from this laboratory on gas diffusion in CMS.1,2The energy distribution is assumed to follow the gamma distribution function. It is shown that the energydistribution model can fully capture the behavior described by the empirical model established in earlierstudies to account for the concentration dependence of thermodynamically corrected barrier and porediffusion coefficients. A methodology is proposed for extracting energy distribution parameters, and it isfurther shown that the extracted energy distribution parameters can effectively predict integral uptakeand column breakthrough profiles over a wide range of operating pressures.
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