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Issue 11, 2018
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Hydrothermal synthesis of Sn-Beta zeolites in F-free medium

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The Sn-Beta zeolite is a unique solid Lewis acid catalyst, showing great potential in the Baeyer–Villiger oxidation reaction as well as the biomass conversion reactions. The direct hydrothermal synthesis of Sn-Beta often involved harmful F ions when using tetraethylammonium hydroxide (TEAOH) as the structure-directing agent (SDA). In this study, N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide was used as the SDA to synthesize the Sn-Beta zeolite in F-free medium. The combination of a small amount of Na+ ions and pure-silica Beta seeds proved to be critical for the successful synthesis of the highly crystalline Sn-Beta zeolite. The Si/Sn ratio could be tuned in the range of 60–200 by varying the gel Na/Si ratio. To obtain highly crystalline Sn-Beta zeolites, the removal of SDA molecules via calcination should be performed subsequent to NH4+ ion-exchange. With a smaller crystal size and stronger Lewis acidity, the obtained Sn-Beta showed a higher catalytic activity than that synthesized in F medium with a comparable Sn content in both the Baeyer–Villiger oxidation reaction and isomerization–esterification reaction.

Graphical abstract: Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

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The article was received on 10 Jul 2018, accepted on 20 Aug 2018 and first published on 21 Aug 2018

Article type: Research Article
DOI: 10.1039/C8QI00672E
Citation: Inorg. Chem. Front., 2018,5, 2763-2771

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    Hydrothermal synthesis of Sn-Beta zeolites in F-free medium

    H. Xu, X. Wang, P. Ji, H. Wu, Y. Guan and P. Wu, Inorg. Chem. Front., 2018, 5, 2763
    DOI: 10.1039/C8QI00672E

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