Anomalous crystallization mechanism in the synthesis of nanocrystalline ZSM-5

Nanocrystalline ZSM-5 (crystal size in the range 10–100 nm) has been synthesized in only 24 h by hydrothermal crystallization of clear supersaturated homogeneous synthesis mixtures. The influence of the aluminum source, aging time, pH, water content and presence of alkaline cations on the properties...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2000-09, Vol.39 (1), p.135-147
Main Authors: Van Grieken, R., Sotelo, J.L., Menéndez, J.M., Melero, J.A.
Format: Article
Language:English
Subjects:
Chemistry
Crystallization mechanism
Exact sciences and technology
General and physical chemistry
Ion-exchange
Nanocrystalline
Surface physical chemistry
Zeolite
Zeolites: preparations and properties
ZSM-5
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Summary:Nanocrystalline ZSM-5 (crystal size in the range 10–100 nm) has been synthesized in only 24 h by hydrothermal crystallization of clear supersaturated homogeneous synthesis mixtures. The influence of the aluminum source, aging time, pH, water content and presence of alkaline cations on the properties of the final nanocrystalline zeolite have been studied. Samples with different degrees of crystallinity have been prepared and characterized by X-ray fluorescence, X-ray diffraction, solid state MAS-NMR, transmission electron microscopy and nitrogen adsorption (BET) in order to investigate the crystallization mechanism. The process involves the formation of an initial amorphous solid prior to the zeolite crystallization, which is gradually transformed into nanocrystalline ZSM-5 through solid–solid transformations. Additionally, the conventional formation of ZSM-5 from crystalline nuclei generated in the remaining liquid solution is observed after 48 h.
ISSN:1387-1811
1873-3093
DOI:10.1016/S1387-1811(00)00190-6