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KMID : 1024519990080020263
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Journal of the Environmental Sciences
1999 Volume.8 No. 2 p.263 ~ p.269
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Pore Size Control of Silica-Coated Alumina Membrane for CO₂ Separation
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Sea Bong-Kuk
Kim Sung-Soo
Kim Tae-Ok
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Abstract
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For effective separation using pore size controlled membrane, silica was deposited in the mesopores of a -alumina film by chemical vapor deposition of tetraethoxysilane (TEOS) and phenyl-substituted ethoxysilanes at 773-873K. The membranes prepared with phenyl-substituted ethoxysilanes were calcined to remove the phenyl group and control the pore size. The gas permaselectivity of prepared membranes was evaluated by using , , and single component and a mixture of and . The membranes produced using TEOS contained micropores having permselectivity only to hydrogen, but the phenyl-subsitituted ethoxysilane derived membranes possessed micorpores which are recognizable molecules of , and . In the diphenyl-diethoxysilane-derived membrane, the permeance and selectivity of / were and 11, respectively. Therefore, the use of phenyl-substituted ethoxysilane was effective in controlling micropore size for separation.
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KEYWORD
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CO₂ separation, Membrane, Gas permeation, CVD, Silica
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