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Date of Publication:2022-10-09

Journal:无机化学学报

Volume:34

Issue:07

Page Number:1351-1364

ISSN No.:1001-4861

Abstract:The influences of seed crystals and crystallization temperatures on the formation evolution and performance of zeolite T membranes were investigated, revealing that dense membranes could be obtained by using smaller seeds and the membrane growth rate was significantly affected by crystallization temperature. High performance zeolite T membranes with flux of 6.21 and 5.98 kg.m(-2).h(-1) respectively and high separation factor (>10 000) for 90%(w/w) isopropanol solution at 348 K were obtained by using 0.4 and 0.6 p.m seeds at 423 K for 4 h. A much long synthesis time was required at low temperature for achieving similar separation performance. It was found that the membrane formation was governed by the same mechanism of epitaxial growth, independent on the seed size and morphology and the crystallization temperature for the investigated synthesis solution. Furthermore, the zeolite T membranes show good hydrothermal and acid stability.

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