High gravity hydrothermal synthesis of hierarchical ZSM-5 for Friedel–Crafts alkylation of toluene with benzyl chloride

Hierarchical ZSM-5 zeolite was prepared via high gravity hydrothermal by a salt-aided seed-induced route. XRD, SEM, TEM, the laser particle size analyzer, N 2 adsorption–desorption and NH 3 -TPD were used to characterize the physicochemical properties of the hierarchical ZSM-5 materials. The prepare...

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Bibliographic Details
Published in:Journal of materials science 2019-06, Vol.54 (12), p.8860-8871
Main Authors: Cheng, Shang-Yuan, Liu, You-Zhi, Qi, Gui-Sheng
Format: Article
Language:English
Subjects:
Adsorption
Alkylation
Ammonia
Catalytic activity
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Chlorides
Classical Mechanics
Comparative analysis
Crystallography and Scattering Methods
Flow velocity
Gravitation
Hydrothermal crystal growth
Materials Science
Particle size
Particle size distribution
Polymer Sciences
Recrystallization
Silicon dioxide
Solid Mechanics
Toluene
Zeolites
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Summary:Hierarchical ZSM-5 zeolite was prepared via high gravity hydrothermal by a salt-aided seed-induced route. XRD, SEM, TEM, the laser particle size analyzer, N 2 adsorption–desorption and NH 3 -TPD were used to characterize the physicochemical properties of the hierarchical ZSM-5 materials. The prepared hierarchical ZSM-5 was compared with sample synthesized by traditional hydrothermal method, and their catalytic performances in the alkylation of toluene with benzyl chloride were investigated. The experimental results indicated that the optimum conditions was the high gravity factor of 94.06, colloidal silica flow rate of 30 ml min −1 and aluminate source mixture flow rate of 20 L h −1 . Under this condition, the hierarchical ZSM-5 was rough quasi-spherical particles with narrow particle size distribution and large S BET of 432.4 m 2  g −1 . The catalyst had superior catalytic activity and was highly reusable preserving its catalytic activity after three reuses. This work showed that sufficient micro-mixing, which affected their catalytic properties, was beneficial for the crystal seed dissolution, recrystallization and mesoporous formation.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-019-03451-6