c State Key Laboratory of Green Chemical
Engineering and Industrial Catalysis, SINOPEC Shanghai Research
Institute of Petrochemical Technology, Shanghai 201208, China
* Corresponding author (Baochang Sun). E-mail: sunbc@mail.buct.edu.cn,
Tel: 010-64443134-803, Address: No 15 Bei San Huan Dong Road, Beijing,
100029, China
* Corresponding author (Jiawei Teng). E-mail: tengjw.sshy@sinopec.com,
Tel: 021-68467713, Address: No 1658 Pudong North Road, Shanghai, 201208,
China
ABSTRACT
Hierarchical (micro/mesopore) ZSM-5 zeolites were hydrothermally
synthesized with enhancing micromixing of the high viscosity reaction
system in a rotating packed bed (RPB). Herein, the effects of four
operating processes with different micromixing intensity on
nucleation/crystal growth process as well as properties of ZSM-5
zeolites were investigated. Results indicated that enhancing
micromixing by RPB in the zeolite synthesis could facilitate the
formation of Al sites and shorten the nucleation and crystallization
period. ZSM-5 samples prepared by the RPB premix process exhibit
hierarchical structure, smaller
average particle size, more uniform particle size distributions, larger
specific surface areas, higher catalytic stability as well as more
Brønsted and Lewis acid sites. While adopting the prepared ZSM-5
zeolites with RPB premix for catalyzing C4-olefin cracking reaction, the
conversion of C4-olefin and yield of propylene were higher than that
obtained by traditional stirring tank reactor premix.
KEYWORDS: ZSM-5 zeolites, Rotating packed bed,
Nucleation/crystal growth mechanism, Al sites, C4-olefin cracking
reaction