Two-step hydrothermal synthesis of hierarchical ZSM-5 zeolite with spherical structure using single template

被引：0
|
作者：
Wang Y. [1 ,2 ]
Wang X. [1 ]
Sun H. [1 ]
Ren Z. [1 ]
Yan Z. [1 ]
Ji S. [2 ]
机构：
[1] College of Science in China University of Petroleum, Qingdao
[2] State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2018年 / 42卷 / 02期
关键词：
Hierarchical ZSM-5 zeolites; Single template; Spherical structure; Two-step hydrothermal method;
D O I：
10.3969/j.issn.1673-5005.2018.02.019
中图分类号：
学科分类号：
摘要：
Hierarchical ZSM-5 zeolites with spherical structure were successfully synthesized via a facile two-step hydrothermal process at low temperature aging and high temperature crystallization period, in which the water glass or silicic acid were selected as silicon source and the tetrapropylammonium hydroxide (TPAOH) was used as the single template. The zeolites were characterized with XRD, FT-IR, N2 adsorption-desorption isotherms, SEM and TEM, through which the formation mechanism of the hierarchical ZSM-5 zeolites with spherical structure was investigated. The results indicate that the hierarchical ZSM-5 zeolite consists of regular spherical particles with around 2 μm in diameter and possesses intercrystalline meso-and macropores generated from the aggregation of bar-shape ZSM-5 nanocrystals. Compared with commercial ZSM-5 zeolite, the as-synthesized products with high relative crystallinity have larger BET specific surface area, mesopore surface area and mesopore volume. And the increasing amounts of the above three parameters for hierarchical ZSM-5 zeolites synthesized with silicic acid as silicon source are reached 114 m2/g, 152 m2/g and 0.094 cm3/g, respectively. It is proposed that the aluminosilicate gel forms nano nuclei firstly with the induction effect of TPA+at the low temperature aging stage. Then, the crystal nucleus grew gradually to become nanocrystalline under the high temperature crystallization process. Finally, the aggregated nanocrystalline continues to grow up into bar-shape ZSM-5 nanocrystals and self-assemble into regular spherical structure. © 2018, Periodical Office of China University of Petroleum. All right reserved.
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页码：153 / 159
页数：6
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