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On the Mesoporogen‐Free Synthesis of Single‐Crystalline Hierarchically Structured ZSM‐5 Zeolites in a Quasi‐Solid‐State System
Author(s) -
Ge Tongguang,
Hua Zile,
He Xiaoyun,
Lv Jian,
Chen Hangrong,
Zhang Lingxia,
Yao Heliang,
Liu Ziwei,
Lin Chucheng,
Shi Jianlin
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504813
Subject(s) - zsm 5 , solid state , zeolite , state (computer science) , materials science , chemical engineering , chemistry , computer science , catalysis , engineering , organic chemistry , algorithm
Hierarchically structured zeolites (HSZs) have gained much academic and industrial interest owing to their multiscale pore structures and consequent excellent performances in varied chemical processes. Although a number of synthetic strategies have been developed in recent years, the scalable production of HSZs single crystals with penetrating and three‐dimensionally (3‐D) interconnected mesopore systems but without using a mesoscale template is still a great challenge. Herein, based on a steam‐assisted crystallization (SAC) method, we report a facile and scalable strategy for the synthesis of single‐crystalline ZSM‐5 HSZs by using only a small amount of micropore‐structure‐directing agents (i.e., tetrapropylammonium hydroxide). The synthesized materials exhibited high crystallinity, a large specific surface area of 468 m 2 g −1 , and a pore volume of 0.43 cm 3 g −1 without sacrificing the microporosity (≈0.11 cm 3 g −1 ) in a product batch up to 11.7 g. Further, a kinetically controlled nucleation–growth mechanism is proposed for the successful synthesis of single‐crystalline ZSM‐5 HSZs with this novel process. As expected, compared with the conventional microporous ZSM‐5 and amorphous mesoporous Al‐MCM‐41 counterparts, the synthesized HSZs exhibited significantly enhanced activity and stability and prolonged lifetime in model reactions, especially when bulky molecules were involved.