Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 45, Pages 10193-10199Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01948h
Keywords
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Funding
- NSFC of China [20890124, 20925310, 20873043]
- Science and Technology Commission of Shanghai Municipality [09XD1401500, 08JC1408700]
- 973 Program [2006CB202508]
- 863 Program [2007AA03Z342, 2008AA030801]
- Shanghai Leading Academic Discipline Project [B409]
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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.
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