Direct synthesis of hierarchical binder-free ZSM-5 and catalytic properties for MTP

• Published in: Microporous and mesoporous materials 2020-01, Vol.292, p.109731, Article 109731
• Main Authors: Zhao, Taotao, Wang, Yaquan, Sun, Chao, Zhao, Aijuan, Wang, Cui, Zhang, Xu, Zhao, Jingjing, Wang, Ziyang, Lu, Jiaxin, Wu, Shuhui, Liu, Wenrong
• Format: Article
• Language: English
• Subjects: Binder-free ZSM-5; Hierarchical pores; MTP; Shaped precursors; ZSM-5
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2019.109731

Hierarchical binder-free ZSM-5 zeolites were prepared via directly crystallizing the shaped precursors by a vapor-phase transport method. Shaped precursors were crystallized at 160 °C for different time (0–6 d) or at different temperatures (120, 140, 160, 180 or 200 °C) for identical time 5 d. The experimental results showed that the typical MFI structure formed in 2 d at 160 °C and the hierarchical binder-free ZSM-5 zeolites were obtained in 5 d attributed to alkaline etching; after crystallization at 160 °C or 180 °C full-crystalline ZSM-5 zeolites were obtained and the ZSM-5 zeolites had hierarchical pores, but, after crystallization at 200 °C, no mesopores were observed. The hierarchical binder-free ZSM-5 crystallized at 160 °C for 5 d showed the best catalytic performance in methanol to propylene reaction, attributed to its lowest ratio of B/L, largest mesoporous volume and external surface area. Preparation of hierarchical binder-free ZSM-5 zeolites via straightly crystallizing shaped precursors by vapor-phase transport method and catalytic properties for MTP. [Display omitted] •Hierarchical binder-free ZSM-5 were obtained via crystallization of shaped precursors by vapor-phase transport method.•The largest mesopores were introduced in binder-free ZSM-5 zeolites at 160 °C for 5 d.•The hierarchical binder-free ZSM-5 exhibited high catalytic performance on methanol to propylene reaction.