Please use this identifier to cite or link to this item: https://doi.org/10.1021/la047970a
Title: A heterogeneous model for gas transport in carbon molecular sieves
Authors: Ding, L.P. 
Yuan, Y.X.
Farooq, S. 
Bhatia, S.K.
Issue Date: 18-Jan-2005
Citation: Ding, L.P., Yuan, Y.X., Farooq, S., Bhatia, S.K. (2005-01-18). A heterogeneous model for gas transport in carbon molecular sieves. Langmuir 21 (2) : 674-681. ScholarBank@NUS Repository. https://doi.org/10.1021/la047970a
Abstract: A dual resistance model with distribution of either barrier or pore diffusional activation energy is proposed in this work for gas transport in carbon molecular sieve (CMS) micropores. This is a novel approach in which the equilibrium is homogeneous, but the kinetics is heterogeneous. The model seems to provide a possible explanation for the concentration dependence of the thermodynamically corrected barrier and pore diffusion coefficients observed in previous studies from this laboratory on gas diffusion in CMS. 1,2 The energy distribution is assumed to follow the gamma distribution function. It is shown that the energy distribution model can fully capture the behavior described by the empirical model established in earlier studies to account for the concentration dependence of thermodynamically corrected barrier and pore diffusion coefficients. A methodology is proposed for extracting energy distribution parameters, and it is further shown that the extracted energy distribution parameters can effectively predict integral uptake and column breakthrough profiles over a wide range of operating pressures.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/88450
ISSN: 07437463
DOI: 10.1021/la047970a
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