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KMID : 1059519930370100867
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Journal of the Korean Chemical Society
1993 Volume.37 No. 10 p.867 ~ p.873
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Synthetic Characteristics of AlPO4-5 Molecular Sieve
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Jhung Sung-Hwa
Hong Suk-Bong
Uh Young-Sun
Chon Hak-Ze
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Abstract
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Influences of crystallization time and H2O / Al2O3 ratio of the reaction mixtures on the synthesis of AlPO4-5 molecular sieve have been studied by X-ray powder diffraction, nitrogen adsorption, scanning electron microscope (SEM), and solid state 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) techniques. The degree of crystallinity of AlPO4-5 follows a sigmoid pattem as crystallization time increases. The induction period is shorter than 1 h when the crystallization process is carried out at 150℃. The conversion of reactants to product, AlPO4-5, can be clearly observed, and all of the determined physical properties change abruptly after about 2 h. It is found that increase in H2O / Al2O3 ratio of the reaction mixtures not only changes the crystal morphology from aggregates to hexagonal single crystals, but also results in the formation of longer AlPO4-5 crystals.
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