Issue 91, 2014

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

Abstract

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, 1H and 13C NMR spectra.

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

Supplementary files

Article information

Article type
Paper
Submitted
25 Jul 2014
Accepted
22 Sep 2014
First published
22 Sep 2014

RSC Adv., 2014,4, 49647-49654

Author version available

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

H. Wen, Y. Zhou, J. Xie, Z. Long, W. Zhang and J. Wang, RSC Adv., 2014, 4, 49647 DOI: 10.1039/C4RA07627C

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