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H2/CO2 Separation Characteristics of γ-Al2O3 Membrane by Aging Stage in Sol-Gel Process
Seung-Joon Yoo†
Jung-Woon Lee1
Un-Yeon Hwang1
Hyung-Sang Park1
Dal-Ryung Park2
Hee-Dong Jang3
Ho-Sung Yoon3
Faculty of Environmental and Chemical Engineering, Seonam University, Korea 1Department of Chemical Engineering, Sogang University, Korea 2Gas R&D Center, Division of Gas Utilization, Korea Gas Corporation, Korea 3Division of Minerals Utilization and Materials, Korea Institute of Geology, Mining & Materials, Korea
Korean Journal of Chemical Engineering, July 2000, 17(4), 438-443(6), 10.1007/BF02706857
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Abstract
γ-AIO(OH) sol solution was prepared by aluminum isopropoxide as an initial material. γ-Al2O3 membane on the α-Al2O3 support was continuously made through coating and thermal treatment from the γ-AIO(OH) sol. Previous work [Yoo et al., 1997] has shown that the aging stage in the sol preparation process mainly affects the characterization of γ-Al2O3 particles as well as γ-AIO(OH) sol. Based on this fact, the γ-AI2O3 membrane was prepared with two aging condition in the present study. The separation characteristics experiment of the H2/CO2 mixture was performed on these membranes. As a result of the study, the mechanism of gas transport on the two membranes was proved as Knudsen diffusion. The ideal separation factor was reached at the value of the calculated Knudsen separation factor; however, permeability increased and selectivity decreased selectivity according to the aging.
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