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xhtangxh木虫 (著名写手)
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微孔－介孔复合分子筛材料 已有2人参与
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Chemistry - A European Journal Volume 17, Issue 52, pages 14987–14995 December 23, 2011 Article first published online: 23 NOV 2011 | DOI: 10.1002/chem.201101594 Well-Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance Dr. Xiao-Yu Yang , Dr. Ge Tian, Dr. Li-Hua Chen, Dr. Yu Li , Dr. Joanna C. Rooke, Dr. Ying-Xu Wei, Prof. Dr. Zhong-Min Liu, Dr. Zhao Deng, Prof. Dr. Gustaaf Van Tendeloo and Prof. Dr. Bao-Lian Su Keywords: crystal growth;heterogeneous catalysis;mesoporous materials;microporous materials;zeolites Abstract Preparation and characterization of well-organized zeolitic nanocrystal aggregates with an interconnected hierarchically micro–meso–macro porous system are described. Amorphous nanoparticles in bimodal aluminosilicates were directly transformed into highly crystalline nanosized zeolites, as well as acting as scaffold template. All pores on three length scales incorporated in one solid body are interconnected with each other. These zeolitic nanocrystal aggregates with hierarchically micro–meso–macroporous structure were thoroughly characterized. TEM images and 29Si NMR spectra showed that the amorphous phase of the initial material had been completely replaced by nanocrystals to give a micro–meso–macroporous crystalline zeolitic structure. Catalytic testing demonstrated their superiority due to the highly active sites and the presence of interconnected micro–meso–macroporosity in the cracking of bulky 1,3,5-triisopropylbenzene (TIPB) compared to traditional zeolite catalysts. This synthesis strategy was extended to prepare various zeolitic nanocrystal aggregates (ZSM-5, Beta, TS-1, etc.) with well-organized hierarchical micro–meso–macroporous structures.  [ Last edited by xhtangxh on 2011-12-18 at 10:38 ] |
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xhtangxh
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Chemistry - A European Journal Volume 17, Issue 51, pages 14618–14627 December 16, 2011 Article first published online: 14 NOV 2011 | DOI: 10.1002/chem.201101401 Hierarchical Mesoporous Zeolites: Direct Self-Assembly Synthesis in a Conventional Surfactant Solution by Kinetic Control over the Zeolite Seed Formation Dr. Yan Zhu, Dr. Zile Hua, Dr. Jian Zhou, Dr. Lijun Wang, Dr. Jinjin Zhao, Dr. Yun Gong, Wei Wu, Meiling Ruan and Prof. Jianlin Shi Keywords: aldol condensations;heterogeneous catalysis;kinetics;surface chemistry;surfactants;zeolites Abstract By kinetic control over the zeolite seed formation, we report the direct fabrication of hierarchical mesoporous zeolites using hexadecyl trimethyl ammonium bromide (CTAB) as the soft template in a conventional solution route. Nanometer-sized, subnanocrystal-type zeolite seeds with a high degree of polymerization are essential to prevent the formation of a separate amorphous mesoporous phase and the phase separation between the mesophase and zeolite crystals in the presence of CTAB and a certain amount of ethanol. The mechanisms for the formation of hierarchically porous zeolites in the solution process, including the effect of mother liquid aging, formation of subnanocrystal zeolite seeds and their self-assembly effect with CTAB, and the role of ethanol are proposed and discussed in detail. The prepared mesoporous ZSM-5 zeolite showed much higher catalytic activity than conventional counterparts for aldol condensations involving large molecules, especially in the synthesis of vesidryl.  [ Last edited by xhtangxh on 2011-12-18 at 10:39 ] |
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