Creation of Al‐enriched mesoporous ZSM‐5 nanoboxes with high catalytic activity: converting tetrahedral extra‐framework Al into framework sites by post treatment

Jiao, Yilai, Forster, Luke, Xu, Shaojun, Chen, Huanhao, Han, Jingfeng, Liu, Xuqing, Zhou, Yangtao, Liu, Jinmin, Zhang, Jinsong, Yu, Jihong, D'Agostino, Carmine and Fan, Xiaolei 2020. Creation of Al‐enriched mesoporous ZSM‐5 nanoboxes with high catalytic activity: converting tetrahedral extra‐framework Al into framework sites by post treatment. Angewandte Chemie International Edition 59 (44) , pp. 19478-19486. 10.1002/anie.202002416

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Abstract

ZSM‐5 zeolite nanoboxes with accessible meso‐micro‐pore architecture and strong acid sites are important in relevant heterogeneous catalysis suffering from mass transfer limitations and weak acidities. Rational design of parent zeolites with concentrated and non‐protective coordination of Al species can facilitate post‐synthetic treatment to produce mesoporous ZSM‐5 nanoboxes. In this work, a simple and effective method was developed to convert parent MFI zeolites with tetrahedral extra‐framework Al into Al‐enriched mesoporous ZSM‐5 nanoboxes with low silicon‐to‐aluminium ratios of ≈16. The parent MFI zeolite was prepared by rapid ageing of the zeolite sol gel synthesis mixture. The accessibility to the meso‐micro‐porous intra‐crystalline network was probed systematically by comparative pulsed field gradient nuclear magnetic resonance diffusion measurements, which, together with the strong acidity of nanoboxes, provided superb catalytic activity and longevity in hydrocarbon cracking for propylene production.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	This is an open access article under the terms of the Creative Commons Attribution License
Publisher:	Wiley
ISSN:	1433-7851
Date of First Compliant Deposit:	10 March 2021
Date of Acceptance:	11 March 2020
Last Modified:	05 May 2023 09:01
URI:	https://orca.cardiff.ac.uk/id/eprint/139602

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