Issue 5, 2020

In situ fabrication of core–shell-structured Beta@Silicalite-1 catalysts by a novel steam-assisted crystallization strategy

Abstract

A green, cost-effective and facile steam-assisted crystallization (SAC) strategy was developed to synthesize core–shell-structured zeolite composites with different frameworks between the core and shell. Chemical incompatibility from different structures has been circumvented by dip-coating Silicalite-1 seeds and an in situ transformation process. Beta@Silicalite-1 zeolites with a nanoscale polycrystal Silicalite-1 shell wrapped around the monocrystal Beta core was synthesized. The crystallization process and synthetic parameters, such as the composition of the core, crystallization temperature and gel composition of the seed solution, were investigated. The results revealed the importance of stability of the core and the crystallization rate of the Silicalite-1 shell. Interestingly, a trace amount of aluminum in the core zeolite could help resist corrosion during crystallization. Further investigation on alkylation and etherification reactions over Beta@Silicalite-1 demonstrated the advantage in selectivity control toward self-etherification versus alkylation.

Graphical abstract: In situ fabrication of core–shell-structured Beta@Silicalite-1 catalysts by a novel steam-assisted crystallization strategy

Supplementary files

Article information

Article type
Paper
Submitted
15 Oct 2019
Accepted
25 Dec 2019
First published
27 Dec 2019

CrystEngComm, 2020,22, 945-954

In situ fabrication of core–shell-structured Beta@Silicalite-1 catalysts by a novel steam-assisted crystallization strategy

L. Xu, Y. Yuan, J. Zhang, Y. Zhang, X. Zhang, L. Chen and L. Xu, CrystEngComm, 2020, 22, 945 DOI: 10.1039/C9CE01624D

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