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Received March 14, 2001
Accepted April 24, 2001
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Synthesis of the [Ga]-MFI under Atmospheric Pressure
Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea 1Agency for Technology and Standards, Kwacheon 427-716, Korea
hahm@mju.ac.kr
Korean Journal of Chemical Engineering, July 2001, 18(4), 468-474(7), 10.1007/BF02698292
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Abstract
The crystallization of the [Ga]-MFI was investigated as a function of synthesis time under atmospheric pressure. The molar composition of the reactants was 100SiO2-Ga2O3-11Na2O-11TPABr-3500H2O. The crystallinity of the [Ga]-MFI was examined by using several analytical instruments, such as XRD, XPS, XRF, FT-IR, solid-state mas-NMR, DTG/DTA, and SEM. The [Ga]-MFI was successfully synthesized under atmospheric pressure at 97 ℃ in 72 h. It was found that the nucleation of the [Ga]-MFI took a quite long time, but the crystallization took place very fast. It is supposed that nucleation is the rate-controlling step in the [Ga]-MFI synthesis under atmospheric pressure. Consequently, if the induction period of the nucleation can be shortened, it would be possible to synthesize the [Ga]-MFI commercially under atmospheric pressure.
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