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

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• 作者：Jian Ding ; Teng Xue ; Haihong Wu ; ^{hhwu@chem.ecnu.edu.cn} ; Mingyuan He
• 关键词：Desilication ; Phosphorus stabilization ; One-step modification ; Hydrothermal stability ; Hydrocarbon cracking
• 刊名：Chinese Journal of Catalysis
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：38
• 期：1
• 页码：48-57
• 全文大小：1578 K
• 卷排序：38

文摘

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 hierarchically 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 desorption, 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 discussed.