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Date of Publication:2022-10-04

Journal:化工学报

Issue:8

Page Number:3100-3108

ISSN No.:0438-1157

Abstract:Three kinds of defect micropore models,i.e., random defect, averaged defect and partial defect models, were established based on the defect-free zigzag pore model in carbon membrane. Adsorption and diffusion behaviors of equimolar CO2/CH4 gas mixture within pores of carbon membrane were investigated in an effort to discuss the influences of pore defect in carbon membranes on gas separation. Results showed that under the operating temperatures ranging from 273 to 348 K, both equilibrium adsorption capacities and diffusion coefficients of CO2 and CH4 in the defect pore models were smaller than those of the defect-free pore model. Total CO2/CH4 separation coefficient of the partial defect pore model was relatively low compared with the defect-free pore model and the other two defect pore models. When the temperature was less than 298 K, total separation coefficients of the random defect and averaged defect pore models were greater than the defect-free pore model, and the total separation coefficients of random defect pore model are beneficial to the averaged defect pore model. Random carbon atom deletion approach is more reasonable than average deletion and partial deletion. The results could provide a basis for the further study of gas permeation mechanism in carbon membranes.

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