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Issue 7, 2018
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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

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Abstract

Chiral zeolites with intrinsically chiral frameworks are highly desired due to their 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 the initial mixture. With this discovery, we developed a generalized non-hydrofluoric acid-assisted synthesis route to synthesize polymorph A-enriched pure-silica zeolite beta. Zeolite beta crystals containing more than 70% chiral polymorph A were obtained. This acid assisted method could not only significantly enrich polymorph A in the crystals of pure-silica zeolite beta but also provide a way for avoiding the utilization of highly toxic concentrated hydrofluoric acid.

Graphical abstract: 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

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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., 2018,5, 1640-1645
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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, 5, 1640
    DOI: 10.1039/C8QI00265G

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