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Identification of the key factor promoting the enrichment of chiral polymorph A in zeolite beta and the synthesis of chiral polymorph A highly enriched zeolite beta

Abstract

Chiral zeolites with intrinsically chiral frameworks are highly desired due to its potential applications in asymmetric catalysis and enantioseparation. Zeolite beta is an intergrowth of chiral polymorph A and achiral polymorph B in a ratio of ca. 44:56. The synthesis of chiral polymorph A of zeolite beta or chiral polymorph A-enriched zeolite beta is one of the biggest challenges. By performing a series of control experiments, we identified the key factor promoting the enrichment of chiral polymorph A in pure-silica zeolite beta, i.e. the acidity of initial mixture. With this discovery, we developed a generalized non-hydrofluoric acid-assisted synthesis route to synthesize polymorph A-enriched pure-silica zeolite beta. The zeolite beta crystals containing more than 70% chiral polymorph A were obtained. This acid assisted method could not only significantly enrich the polymorph A in the crystal of pure-silica zeolite beta but also provide a way of avoiding the utilization of highly toxic concentrated hydrofluoric acid.

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Publication details

The article was received on 26 Mar 2018, accepted on 03 May 2018 and first published on 04 May 2018


Article type: Research Article
DOI: 10.1039/C8QI00265G
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Identification of the key factor promoting the enrichment of chiral polymorph A in zeolite beta and the synthesis of chiral polymorph A highly enriched zeolite beta

    T. Lu, L. Zhu, X. Wang, W. Yan, W. Shi and R. Xu, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00265G

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