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摘要
Hierarchical ZSM-5 microspheres were synthesized from a ZSM-5 synthesis solution with the addition of 3-aminopropyltriethoxysilane (APTES). The time dependent revolution of structure and morphology was investigated by XRD, SEM, TEM, N-2 adsorption-desorption, and Si-29 MAS NMR techniques. The results indicated that amorphous aluminosilicate microspheres with diameter of 8 mu m were obtained at the initial stage of the synthesis. With the crystallization going on, the amorphous aluminosilicates gradually crystallized to ZSM-5 structure while preserving the spherical morphology. For the first time, a novel phenomenon of localized crystallization of ZSM-5 has been demonstrated in a conventional zeolitic synthesis solution aided by APTES. Moreover, after removing the amorphous silicic residues, the hierarchical ZSM-5 microspheres showed excellent catalytic properties in benzylation of benzene and catalytic cracking of polypropene.
- 出版日期2013-3-15
- 单位浙江师范大学
