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Identification of Molecular Transport Mechanisms in Micro-Porous Hydrotalcite–Silica Membrane

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Abstract

Hydrotalcite (HT) materials have been known to be able to adsorb \(\hbox {CO}_{2}\) even at high temperature. However, HT has not been made into a micro-porous membrane because of its meso-porous nature. In order to form a micro-porous HT membrane, silica was selected as a host matrix due to its ability to retain its micro-porosity. In this paper, a micro-porous hydrotalcite–silica membrane was formed on a meso-porous \(\upgamma \)-alumina layer supported by a macro-porous \(\upalpha \)-alumina substrate. Most of the micro-porosity determined from nitrogen adsorption measurement was found to be either closed or open but not interconnected, whereas most of the meso-porosity (at ca. 11.2 nm) in the micro-porous membrane was open and interconnected, thereby promoting gas flow. Viscous flow mechanism was observed to dominate transport of gases in macro-porous membrane. Knudsen diffusion dominated transport of gases in meso-porous membrane. On the other hand, surface affinity influenced the transport of carbon dioxide through the micro-porous membrane rather significantly. While permeability of pure hydrogen and carbon dioxide were independent of pressure, the permeability of the gases in the binary mixtures decreased with increasing pressure. Both experiment and simulation demonstrated consistent results.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2013R1A2A2A01014540).

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Authors and Affiliations

  1. School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal , 14300, Penang, Malaysia

    A. D. Wiheeb, M. A. Ahmad, M. N. Murat & M. R. Othman

  2. Department of Chemical Engineering, College of Engineering, University of Tikrit, Tikrit, Salah ad Din, Iraq

    A. D. Wiheeb

  3. Department of Chemical Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin , 446-701, Gyeonggi-do, Korea

    J. Kim & M. R. Othman

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  1. A. D. Wiheeb
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  2. M. A. Ahmad
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  3. M. N. Murat
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  4. J. Kim
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  5. M. R. Othman
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Correspondence to M. R. Othman.

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Wiheeb, A.D., Ahmad, M.A., Murat, M.N. et al. Identification of Molecular Transport Mechanisms in Micro-Porous Hydrotalcite–Silica Membrane. Transp Porous Med 104, 133–144 (2014). https://doi.org/10.1007/s11242-014-0324-5

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  • DOI: https://doi.org/10.1007/s11242-014-0324-5

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