Modeling of gas transport in a microporous solid using a slice selection procedure: Application to the diffusion of benzene in ZSM5

Abstract : The analytical solution of the equations of gas diffusion in a heterogeneous zeolite bed is presented. The problem is handled by assuming that the bed consists of a large number of very thin layers of solid, perpendicular to the direction of propagation of the gas. Mass transfer by diffusion in such a material is determined by a system of differential equations with boundary and interface conditions. The results allow us to make the theoretical determination of the time dependence of the concentration profiles and the inter- and intracrystallite diffusion coefficients of a gas in each layer of the bed. A numerical application concerns the diffusion of benzene in a cylindrical bed of ZSM5 displaced vertically and rapidly, step-by-step, inside the NMR probe. Thus, the time dependence of the concentration of gas absorbed at the level of each slice and each crystallite can be obtained. These coupled investigations give a better understanding of the diffusion process in this multilayer material.
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Catalysis Today, Elsevier, 2008, 139 (3), pp.234 - 240. 〈10.1016/j.cattod.2008.05.034〉
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https://hal.univ-lorraine.fr/hal-01482113
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Soumis le : vendredi 3 mars 2017 - 11:37:18
Dernière modification le : lundi 15 octobre 2018 - 18:58:03

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Michel Petryk, Sébastien Leclerc, Daniel Canet, Jacques Fraissard. Modeling of gas transport in a microporous solid using a slice selection procedure: Application to the diffusion of benzene in ZSM5. Catalysis Today, Elsevier, 2008, 139 (3), pp.234 - 240. 〈10.1016/j.cattod.2008.05.034〉. 〈hal-01482113〉

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