Citation: Jian Ding, Teng Xue, Haihong Wu, Mingyuan He. One-step post-synthesis treatment for preparing hydrothermally stable hierarchically porous ZSM-5[J]. Chinese Journal of Catalysis, ;2017, 38(1): 48-57. doi: 10.1016/S1872-2067(16)62549-4 shu

One-step post-synthesis treatment for preparing hydrothermally stable hierarchically porous ZSM-5

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China

Received Date: 31 August 2016
Revised Date: 30 September 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21403070, 21573073), National Key Technology Research and De-velopment Program (2012BAE05B02), and Shanghai Leading Academic Discipline Project (B409).

Hierarchically porous ZSM-5 (SiO₂/Al₂O₃≈120) containing phosphorus was prepared by a one-step post-synthesis treatment involving controlled desilication and phosphorous modification. The hier-archically porous ZSM-5 featured high thermal and hydrothermal stability. The obtained ZSM-5 zeolites were systematically characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N₂ adsorption-desorption, NH₃ temperature-programmed de-sorption, and ²⁷Al and ³¹P magic-angle spinning nuclear magnetic resonance spectroscopy. The prepared ZSM-5 displayed enhanced activity and prolonged lifetime toward hydrocarbon cracking. The high activity was attributed to improved coke tolerance owing to the presence of the highly stable mesoporous network of ZSM-5 and acid sites introduced upon phosphorus modification. Additionally a mechanism of the stabilization of the zeolites by phosphorus was proposed and dis-cussed.
- Desilication,
- Phosphorus stabilization,
- One-step modification,
- Hydrothermal stability,
- Hydrocarbon cracking
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