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Article Dans Une Revue Microporous and Mesoporous Materials Année : 2024

Highly hydrophobic zeolite ZSM-8 with perfect framework structure obtained in a strongly acidic medium

Résumé

The synthesis of zeolites in a strongly acidic medium is a new and nearly unexplored chemistry field. In addition to the previously reported silicalite-1 and the several clathrasils, this paper elaborates that one more material of unique properties could be successfully crystallized in the strongly acidic fluoride medium. A pure-silica zeolite ZSM-8 has been obtained using tetraethylammonium ion as a structure-directing agent. Rietveld refinement proves that ZSM-8 is of the MFI topology, i.e., it is another silicalite-1 but different in framework distortions. Moreover, the discrete and uniform crystals of the acidic-medium synthesized pure-silica ZSM-8 possess a substantially perfect framework structure and thus hydrophobic surfaces. This remarkable character renders the material an ideal adsorbent for discriminating molecules on the polarity basis, which is desired in developing green separation processes. C3H8, CH4, and CO2 are chosen as examples respecting their different polarities and tested for the adsorptive parameters.
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hal-04285111 , version 1 (14-11-2023)

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Yiqing Sun, Qiaolin Lang, Guangying Fu, Haonuan Zhao, Eddy Dib, et al.. Highly hydrophobic zeolite ZSM-8 with perfect framework structure obtained in a strongly acidic medium. Microporous and Mesoporous Materials, 2024, 363, pp.112839. ⟨10.1016/j.micromeso.2023.112839⟩. ⟨hal-04285111⟩
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