Article Dans Une Revue Microporous and Mesoporous Materials Année : 2013

The separation of xylene isomers by ZIF-8: a demonstration of the extraordinary flexibility of the ZIF-8 framework

David Peralta
  • Fonction : Auteur
Angélique Simon-Masseron
Karin Barthelet
  • Fonction : Auteur
Gerhard Pirngruber

Résumé

The present work describes the adsorption and separation of xylene isomers by ZIF-8. Although the formal pore diameter of ZIF-8 is much smaller than the molecular diameter of the xylene isomers, ZIF-8 is able to separate the isomers by molecular sieving. A structural study indicates that the diffusion of the xylenes into the pore structure of ZIF-8 happens via a transitory deformation of the pore aperture which is based on a tilt of the imidazolate linkers, followed by a return to the initial conformation. The rate of adsorption depends on the size of the isomer, i.e. it decreases from para- to meta- and to ortho-xylene. The separation of the xylene isomers is good in the gas phase. In liquid phase breakthrough experiments, the quality of the separation is deteriorated. Moreover, as expected for a separation based on molecular sieving, para-xylene cannot be well separated from ethyl-benzene.

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Dates et versions

hal-04389726 , version 1 (11-01-2024)

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David Peralta, Gerald Chaplais, Jean-Louis Paillaud, Angélique Simon-Masseron, Karin Barthelet, et al.. The separation of xylene isomers by ZIF-8: a demonstration of the extraordinary flexibility of the ZIF-8 framework. Microporous and Mesoporous Materials, 2013, 173, pp.1-5. ⟨10.1016/j.micromeso.2013.01.012⟩. ⟨hal-04389726⟩
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