Pure-silica ZSM-22 zeolite rapidly synthesized by novel ionic liquid-directed dry-gel conversion

Shortening the crystallization process of zeolites is significant for their applications because of the energy savings. Here, we report a rapid synthetic route for pure-silica ZSM-22 zeolite with TON topology. The synthesis was achieved by dry-gel conversion, where the dry gel was prepared under an...

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Published inRSC advances Vol. 4; no. 91; pp. 49647 - 49654
Main Authors Wen, Haimeng, Zhou, Yu, Xie, Jingyan, Long, Zhouyang, Zhang, Wei, Wang, Jun
Format Journal Article
LanguageEnglish
Published 01.01.2014
Subjects
Aluminum
Conversion
Crystallization
Energy conservation
Ionic liquids
Spectra
Strategy
Zeolites
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Summary:Shortening the crystallization process of zeolites is significant for their applications because of the energy savings. Here, we report a rapid synthetic route for pure-silica ZSM-22 zeolite with TON topology. The synthesis was achieved by dry-gel conversion, where the dry gel was prepared under an unusual acidic condition for hydrolyzing the silica precursor with 1,3-alkylimidazolium ionic liquid as the structure-directing agent (SDA). Highly crystallized pure-silica ZSM-22 can be synthesized within 2 days of crystallization, dramatically shorter than 10% of the conventional hydrothermal strategy. Using a similar procedure, Al-containing ZSM-22 can also be synthesized by simply adding aluminum salt in the initial gel. In addition, understanding of the structure-directing role of ionic liquids is attempted through characterizations of IR, TG, 1 H and 13 C NMR spectra.
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ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA07627C