期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 17, 期 51, 页码 14618-14627出版社
WILEY-BLACKWELL
DOI: 10.1002/chem.201101401
关键词
aldol condensations; heterogeneous catalysis; kinetics; surface chemistry; surfactants; zeolites
资金
- National Natural Science Foundation of China [20633090, 20703055, 50872140, 50702072]
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.
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