A self-supported SS-fiber@meso-HZSM-5 core-shell catalyst via caramel-assistant synthesis toward prolonged lifetime for the methanol-to-propylene reaction

作者：Ding, Jia; Zhang, Zhiqiang; Han, Lupeng; Wang, Chunzheng; Chen, Pengjing; Zhao, Guofeng^*; Liu, Ye; Lu, Yong^*

来源：RSC Advances, 2016, 6(54): 48387-48395.

DOI：10.1039/c6ra08944e

• ZEOLITE SINGLE-CRYSTALS
• ZSM-5 ZEOLITE
• MESOPOROSITY
• DEACTIVATION
• SELECTIVITY
• FABRICATION
• TEMPLATES
• OLEFINS

A self-supported SS-fiber@meso-HZSM-5 core-shell catalyst was essentially designed and engineered from micro- to macro-scale by caramel-assistant hydrothermal synthesis. The significant role of caramel during the crystallization process was revealed in detail. Caramel not only created the mesoporosity in the ZSM-5 crystals, but also released acid under hydrothermal synthesis conditions which lowered the zeolite crystallinity. By taking advantage of the mesopore development in a hierarchical micro-meso-macropore structure with favourably-tuned acidic properties, such a catalyst provided a dramatically prolonged lifetime of 845 h (>90% conv.) with high propylene selectivity (e.g., 48%) in the MTP reaction. The hierarchical pore structure development mainly increased the accommodation capacity of the zeolite shell for receiving formed coke thereby leading to a dramatically prolonged lifetime in the MTP reaction.

• 出版日期2016
• 单位华东师范大学