Studies on the Crystallization Behavior of Zeolite Silicalite-1 in (TPA)2O-Na2O-SiO2-H2O System(Ⅰ)──Crystallization Kinetics

Abstract

Abstract: Zeolite silicalite^-1 was hydrothermally synthesized in (TPA)₂O-Na₂O-SiO₂-H₂Osystem.The silica sources used were fumed silica(Ⅰ), silica sol (Ⅱ) and waterglass(Ⅲ).There are different crystallization kinetic curves in the temperature range from 140℃ to 180 ℃ for different silica source systems with the same molar ratio of reactant.The activation energy for nucleation (E_n) and for crystallization (E_c), which are calculated from the induc-tion time and growing rate, are 46/76 kJ/mol in system (Ⅰ), 41/43 kJ/mol in system (Ⅱ),and 38/78 kJ/mol in system (Ⅲ), respectively.The crystal size obtained in each system de-pends on the difference between E_n and E_c The highest product crystallinity determined both by XRDand by adsorption of n-hexane was obtained in fumed silica system.The quality of the zeolite obtained can be improved by increasing the temperature of crystallization.

Key words: Crystallization kinetics, Silicalite-1, Zeolite

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WU Ai-Mei, LONG Ying-Cai. Studies on the Crystallization Behavior of Zeolite Silicalite-1 in (TPA)₂O-Na₂O-SiO₂-H₂O System(Ⅰ)──Crystallization Kinetics[J]. Chem. J. Chinese Universities, 1997, 18(1): 15.

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Studies on the Crystallization Behavior of Zeolite Silicalite-1 in (TPA)₂O-Na₂O-SiO₂-H₂O System(Ⅰ)──Crystallization Kinetics

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