Synthesis of ZSM-5 zeolite hollow spheres with a core/shell structure

被引：57
作者：
Wang, Zhendong [1 ]
Liu, Yueming [1 ]
Jiang, Jin-gang [1 ]
He, Mingyuan [1 ]
Wu, Peng [1 ]
机构：
[1] E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2010年 / 20卷 / 45期
关键词：
FUNCTIONALIZED INTERIORS; HYDROTHERMAL STABILITY; SILICA; MICROCAPSULES; FABRICATION; CRYSTALS; SURFACE; CRYSTALLIZATION; MICROSPHERES; NANOCRYSTALS;
D O I：
10.1039/c0jm01948h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Hollow and core/shell ZSM-5 spheres were simply synthesized through in situ transformation of mesoporous silica spheres (MSS) into MFI-type zeolite with the assistant of isopropylamine (IPA) as a structure-directing agent (SDA). IPA, with a mild structure-directing ability for the construction of MFI structure, triggered a stepwise crystallization of MSS after Al addition. First, the sphere surface was crystallized to a shell of ZSM-5 crystals. The silica and alumina species in the core condensed and crystallized to ZSM-5 thereafter, forming zeolite crystal aggregates inside the spheres. The obtained ZSM-5 spheres were highly crystalline materials and maintained the shape of pristine MSS, but exhibited a hollow and core/shell structure. The techniques of XRD, FT-IR, SEM, N2 adsorption-desorption, (29)Si and (27)Al MAS NMR were employed to trace the crystallization process, which allowed us to propose a "templating and surface to core" crystallization mechanism. This strategy may serve as an alternative way for synthesizing hollow zeolite spheres.
引用
收藏
页码：10193 / 10199
页数：7
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