Hydrothermal synthesis of microporous titanosilicates

Titanosilicates of various framework topology are synthesized in the template-free Na 2O–(K 2O)–TiO 2–SiO 2–H 2O system. The fields of crystallization of the as-synthesized phases are outlined and the role of certain physicochemical parameters on the framework type, crystal size and morphology as we...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2007-10, Vol.105 (3), p.232-238
Main Authors: Kostov-Kytin, V., Ferdov, S., Kalvachev, Yu, Mihailova, B., Petrov, O.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Crystallization fields
Exact sciences and technology
General and physical chemistry
Hydrothermal synthesis
Ion-exchange
Kinetic investigations
Porous materials
Surface physical chemistry
Titanosilicates
Zeolites: preparations and properties
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Summary:Titanosilicates of various framework topology are synthesized in the template-free Na 2O–(K 2O)–TiO 2–SiO 2–H 2O system. The fields of crystallization of the as-synthesized phases are outlined and the role of certain physicochemical parameters on the framework type, crystal size and morphology as well as crystal aggregate texture of the run-products is studied. Kinetic investigations carried out in the potassium-free system give insights on the atomic arrangements in the amorphous sodium titanosilicate precursor powders, their evolution upon hydrothermal treatment and the related phase formation sequence. The synthesis results reveal possible mechanisms of increasing the structural diversity of synthetic heterosilicates with desired pore system and functionality by varying the composition of framework and extraframework cations and appropriate adjusting of the pH and temperature of reaction medium.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2007.03.036