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Journal of Porous Media
インパクトファクター: 1.752 5年インパクトファクター: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v18.i4.20
pages 379-388

SURFACE AFFINITY AND INTERDIFFUSIVITY OF CARBON DIOXIDE INSIDE HYDROTALCITE−SILICA MICROPORES: CO2 INTERDIFFUSION INSIDE HT−Si MICROPORES

Ahmed Daham Wiheeb
School of Chemical Engineering, Universiti Sains Malaysia 14300 Nibong Tebal, Penang, Malaysia; Department of Chemical Engineering, College of Engineering, University of Tikrit, Salah ad Din, Iraq
Mohd Azmier Ahmad
School of Chemical Engineering, Universiti Sains Malaysia 14300 Nibong Tebal, Penang, Malaysia
Muhamad Nazri Murat
School of Chemical Engineering, Universiti Sains Malaysia 14300 Nibong Tebal, Penang, Malaysia
Jin-Soo Kim
Department of Chemical Engineering, Kyung Hee University, Global Campus, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea
Mohd Roslee Othman
School of Chemical Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia; Department of Chemical Engineering, Kyung Hee University, Global Campus, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea

要約

The different level of carbon dioxide diffusion in microporous hydrotalcite-silica membrane can be explained by the attractive forces between the molecules and the affinitive medium between molecules of different gas species and the molecular weight of the gases. For a molecular sieve membrane that exhibits high affinity for carbon dioxide, the gas transport in the membrane is predominantly surface adsorption. Pure carbon dioxide, despite the fact that it is heavier than hydrogen, nitrogen, and methane, is preferentially adsorbed (by losing more of its energy due to affinitive forces) onto the pore wall of hydrotalcite material in the membrane. Nitrogen gas can reduce the ability of carbon dioxide to be adsorbed and diffused into the membrane by as much as 1.9 kJ/mol at elevated pressure. The presence of the other two gases in the binary mixture can also perturb the ability of CO2 to be adsorbed and diffused into the membrane micropores.


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