dc.citation.conferencePlace |
KO |
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dc.citation.conferencePlace |
Seoul, Korea |
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dc.citation.title |
Korean Ceramic Society Spring Meeting |
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dc.contributor.author |
Cho, Yoon-Kyoung |
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dc.contributor.author |
Han, K. |
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dc.contributor.author |
Lee, K.-H. |
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dc.date.accessioned |
2023-12-20T07:07:47Z |
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dc.date.available |
2023-12-20T07:07:47Z |
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dc.date.created |
2014-12-23 |
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dc.date.issued |
1994-01-01 |
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dc.description.abstract |
The composite membranes of γ-Al2O3 were fabricated by sol-gel coating with boehmite (AlOOH) sol. The thickness of the membranes were in the range of 2-5 μm depending on the number of coatings and the concentration of the sol. The permeabilities of He, N2, and CO2 were measured at temperatures of 298-673 K and pressures of 101.3-405.2 KPa. The permeability through γ-Al2O3 membrane was constant with the pressure difference and decreased with the square root of temperature. The main mechanism of gas transport through γ-Al2O3 membrane was thus proved as Knudsen diffusion. CaO was impregnated on the γ-Al2O3 membrane to improve separation factor by introducing interactions between CO2 gas molecules and the pore wall, but high separation factor was not obtained. Silica modified γ-Al2O3 membrane was also prepared to increase the separation factor. The separation factor of CO2 to N2 was increased to 1.4 at 298 K though it decreased with increasing temperature. The separation experiment of a CO2/N2 mixture was also performed. The separation factor was 1.72 at 298 K and 1.5 at 673 K, which were much higher than that of the Knudsen diffusion mechanism, 0.8. |
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dc.identifier.bibliographicCitation |
Korean Ceramic Society Spring Meeting |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/47240 |
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dc.language |
영어 |
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dc.publisher |
Korean Ceramic Society |
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dc.title |
Separation of CO2 by modified γ-Al2O3 membranes at high temperature |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
1994 |
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