Kinetic separation of CO2 and CH4 on Carbon Molecular Sieves: Study of the internal diffusion and surface resistance of pure gases and binary gas mixtures Introduction and objectives - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2014

Kinetic separation of CO2 and CH4 on Carbon Molecular Sieves: Study of the internal diffusion and surface resistance of pure gases and binary gas mixtures Introduction and objectives

Résumé

Carbon Molecular Sieves (CMS) adsorbents appear to be good candidates for gas kinetic separations by using Pressure Swing Adsorption (PSA) processes: their pore morphologies could imply diffusion rate variations depending on their nature and the size of the gas adsorbate. We studied the separation of CO2 and CH4 with a CMS material in PSA processes experimentally and by using the Linear Driving Force (LDF) theory. The results show a high kinetic selectivity for CO2. But there are lacks in the understanding of the involved diffusion phenomena. Thus, we propose to distinguish the different involved phenomena of diffusion by measuring the diffusion coefficients of CO2 and CH4 on the CMS using the Zero Length Column (ZLC) method [1]: this macroscopic method allows to separate the diffusion mechanisms by adjusting the gas velocities in the column containing the adsorbent material. The conclusion of these measurements is that the CH4 diffusion is only controlled by surface resistance diffusion whereas both internal and surface diffusion resistances are involved in CO2 diffusion as already showed by Liu and Ruthven on others CMS materials [2]. In addition of these evaluations, we propose to focus on the binary diffusion of CH4 and CO2 and then to study the influence on the kinetic selectivity of a residual adsorption of CO2 or CH4 on the CMS adsorbent when separating the CO2-CH4 mixture. The results of the binary diffusion rate measurements will be presented and qualitatively linked to the textural properties of the studied CMS.
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hal-01373919 , version 1 (29-09-2016)

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  • HAL Id : hal-01373919 , version 1

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Lomig Hamon, Clément Garénaux, Pascaline Pre. Kinetic separation of CO2 and CH4 on Carbon Molecular Sieves: Study of the internal diffusion and surface resistance of pure gases and binary gas mixtures Introduction and objectives. 10th International Symposium on the Characterisation of Porous Solids, May 2014, Grenade, Spain. . ⟨hal-01373919⟩
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