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Sustainable Synthesis of Hierarchically Porous Silicalite-1 Zeolite by steam-assisted crystallization of Solid Raw Materials Without Secondary Templates

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Chemical Research in Chinese Universities 2018年第3期34卷 350-357页

作者： LIU Xiaofang ZENG Shangjing WANG Runwei ZHANG Zongtao QIU Shilun State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changehun 130012 E R. China CAS Key Laboratory of Synthetic Rubber Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

Hierarchical silicalite-1 zeolites were obtained from the direct conversion of a mixture of ground solid raw materials via a steam-assisted crystallization（SAC） method without involvement of any mesoscale template. Only a trace amount of water was necessary during the crystallization, implying that the amount of water can be dramatically reduced, which still offers easy separation and high yields. The simple procedure involved only grinding and heating, which not only saves resources and energy, but also significantly reduces the discharge of eco-friendly synthesis of zeolites for practical applications. Compared to conventional bulk silicalite-1, the nanosized hierarchical zeolites with MFI structure show enhanced removal capabilities for methylene blue owing to their hierarchical porosity.

关键词： Hierarchically silicalite-1 zeolite steam-assisted crystallization Easy separation Secondary template excluding

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Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 772-783页

作者： Xiu Gao Beining Luo Yanping Hong Peihang He Zedong Zhang Guoqiang Wu Jiangxi Key Laboratory of Natural Products and Functional Food Jiangxi Agricultural UniversityNanchang 330045China School of Food Science and Engineering Jiangxi Agricultural UniversityNanchang 330045China

Development of a titanium silicalite-1(TS-1)catalyst with good crystallinity and a four-coordinate Ti framework is critical for efficient catalytic oxidation reaction under mild ***,a size-controlled TS-1 zeolite(TS-10.1ACh(acetylcholine))was synthesized via steam-assisted crystallization by introducing acetylcholine as a crystal growth modifier in the preparation process,and TS-10.1ACh was also employed in epoxidations of different substrates containing C=C double *** crystalline sizes of the as-synthesized TS-10.1ACh catalysts were controlled with the acetylcholine content,and characterization results showed that the particle sizes of highly crystalline TS-10.1ACh zeolite reached 3.0μm with a good Ti *** the synthetic process,the growth rate of the crystals was accelerated by electrostatic interactions between the connected hydroxyl groups of the acetylcholine modifier and the negatively charged skeleton of the ***,the TS-10.1ACh catalyst demonstrated maximum catalytic activity,good selectivity and high stability during epoxidation of allyl ***,the TS-10.1ACh catalyst was also highly versatile and effective with different unsaturated *** findings may provide novel,easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

关键词： size-controlled TS-1 crystal modifier steam-assisted crystallization epoxidation

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