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Creation of Al‐Enriched Mesoporous ZSM‐5 Nanoboxes with High Catalytic Activity: Converting Tetrahedral Extra‐Framework Al into Framework Sites by Post Treatment
Author(s) -
Jiao Yilai,
Forster Luke,
Xu Shaojun,
Chen Huanhao,
Han Jingfeng,
Liu Xuqing,
Zhou Yangtao,
Liu Jinmin,
Zhang Jinsong,
Yu Jihong,
D'Agostino Carmine,
Fan Xiaolei
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202002416
Subject(s) - zeolite , mesoporous material , materials science , catalysis , porosity , zsm 5 , rational design , fluid catalytic cracking , chemical engineering , silicon , molecular sieve , nanotechnology , cracking , chemistry , organic chemistry , metallurgy , composite material , engineering
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.