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Received August 5, 2000
Accepted November 13, 2000
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Preparation of Microporous Silica Membranes for Gas Separation
Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, Korea 1Department of Materials Physics and Chemistry, Kyushu University, 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan
Korean Journal of Chemical Engineering, January 2001, 18(1), 106-112(7), 10.1007/BF02707206
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Abstract
Microporous silica membranes for hydrogen separation were prepared on a γ-alumina coated a-alumina tube by sol-gel method. The reactants of sol-gel chemistry were tetraethoxysilane (TEOS) and methacryloxypropyltrimethoxysilane (MOTMS). The silane coupling agent, MOTMS, was added as a template in order to control the pore structure to the silicon alkoxide. TEOS. In particular, the microporous membranes were prepared by changing the molar ratio of MOTMS with respect to other substances, and their pore characteristics were analyzed. Then, the effects of thermal treatment on the micropore structure of the resulting silica membranes were investigated. The pore size of the silica membrane prepared after calcination at 400-700 ℃ was in the range of 0.6-0.7 nm. In addition, permeation rates through the membranes were measured in the range of 100-300 ℃ using H-2, CO2, N-2, CH4, C2H6, C3H6 and SF6. The membrane calcined at 600 ℃ showed a H-2 permeance of 2x10(-7)-7x10(-7) molm(-2)s(-1)Pa(-1) at permeation temperature 300 ℃. and the separation factors for equimolar gas mixtures were 11 and 36 for a H-2/CO2 mixture and 54 and 132 for a H-2/CH4 mixture at permeation temperatures of 100 ℃ and 300 ℃, respectively.
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So JH, Yang SM, Park SB, J. Membr. Sci., 147(2), 147 (1998)
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Tsapatsis M, Kim SJ, Nam SW, Gavalas G, Ind. Eng. Chem. Res., 30, 2152 (1991)
Uhlhorm RJR, Keizer K, Burrggaaf AJ, J. Membr. Sci., 46, 225 (1989)
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Yan SC, Maeda H, Kusakabe K, Morooka S, Akiyama Y, Ind. Eng. Chem. Res., 33(9), 2096 (1994)
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Yoldas BE, J. Appl. Chem. Biotechnol., 23, 803 (1973)
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