Studies on the Crystallization Behavior of Zeolite Silicalite－1 in(TPA)2O-Na2O-SiO2－H2O System(Ⅱ)──Low Temperature Preparation and Characterization of Fine Crystals

Abstract

Abstract: Zeolite slllcallte－1 with a high crystallinity was synthesized in the system of(TPA)₂O-Na₂O-SiO₂－H₂Oat 60℃ by using fumed silica－silica aerogel(Ⅰ) or silica sol(Ⅱ)as the silicon source. The crystal size of products obtained is 0.2 μm in(Ⅰ) and 0.45μm in(Ⅱ) measured by SEM, and 0.02μm determined by the method of XRDpeak broadness.Incomparison with the properties of sample Aprepared at 180℃,the fine crystals Bsynthe－sized at 60℃ possess some characters which the nanometer particles have.The adsorption ofn－hexane on sample Bis abnormaly high.Investigated by XRD, FT－IR, ²⁹Si MAS NMRandTG/DTG/DTA, the temperatures for structural damage and for monoclinic/orthorhombicspmmetrt transformation ofsample Bare obviously lower than that of sample A. The de－fects of Si-OHin sample Bare much more than those in sample A.

Key words: Zeolite silicalite－1, Nanometer material, Low temperature synthesis, Adsorption, Structural characterization

CLC Number:

O613

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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(Ⅱ)──Low Temperature Preparation and Characterization of Fine Crystals[J]. Chem. J. Chinese Universities, 1997, 18(9): 1407.

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Studies on the Crystallization Behavior of Zeolite Silicalite－1 in(TPA)₂O-Na₂O-SiO₂－H₂O System(Ⅱ)──Low Temperature Preparation and Characterization of Fine Crystals

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