The synthesis of colloidal zeolite TPA-silicalite-1

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Title:	The synthesis of colloidal zeolite TPA-silicalite-1
Authors:	Tsay,CS;Chiang,AST
Contributors:	化學工程與材料工程學系
Keywords:	TITANIUM SILICALITE;GROWTH;CRYSTALLIZATION;PRECURSORS;NUCLEATION;MECHANISM;SUSPENSIONS;SCATTERING;MEMBRANES;CRYSTALS
Date:	1998
Issue Date:	2010-06-29 17:30:10 (UTC+8)
Publisher:	中央大學
Abstract:	The synthesis of colloidal TPAsilicalite-1 from a clear xTPAOH-yH(2)O-TEOS precursor sol, with x=0.01-0.443 and y=20-80, has been studied at 115 degrees C. Both the starting sol and the reaction products at various times were examined by dynamic light scattering (DLS) to determine the size of the colloidal (or sub-colloidal) particles presented. In addition, the pH of the system has been measured. The observations made with the DLS were consistent with the literature results. In essence, uniform particles of colloidal zeolite were formed during the reaction, and their size grew linearly with reaction time. At the same time, sub-colloidal particles smaller than 5 nm were also observed that persisted throughout the process. The measured pH, on the other hand, could be satisfactorily modeled by the equilibrium theory, suggesting that an equilibrium distribution of dissolved silicates was established before the reaction, and a different equilibrium was attended when colloidal zeolites, as well as the co-existing sub-colloidal particles, were observed. The number density of the colloidal particles rho was found to depend on the 3.4 power of the silica concentration and the ratio x. (C) 1998 Elsevier Science B.V. All rights reserved.
Relation:	MICROPOROUS AND MESOPOROUS MATERIALS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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