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In relation to this article, we declare that there is no conflict of interest.
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Received February 10, 2015
Accepted April 23, 2015
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Micro- and mesoporous CuBTCs for CO2/CH4 separation

Petroleum and Gas Laboratory, Korea Institute of Energy Research, Daejeon 305-343, Korea 1Oil & Gas Process R&D Part, Central Research Institute, Samsung Heavy Industries Co., LTD., Seongnami-si 463-400, Korea
jnkim@kier.re.kr
Korean Journal of Chemical Engineering, December 2015, 32(12), 2501-2506(6), 10.1007/s11814-015-0088-9
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Abstract

Micro- and mesoporous CuBTCs, referred to as micro- and meso-CuBTCs, were synthesized, and tested for their capacity to adsorptively remove CO2 from a binary mixture of CO2-CH4. Physicochemical analyses of the thermally treated Cu-BTCs were performed. The CO2 and CH4 adsorption isotherms for the Cu-BTCs at 25 oC in the pressure range 0-3MPa were experimentally measured and implemented for calculating the CO2/CH4 selectivity as a function of pressure and CO2 concentration using the ideal adsorbed solution theory (IAST). The CH4 adsorption capacity of meso-CuBTC at 3MPa was reduced to 43% of that of micro-CuBTC, whereas the CO2 adsorption capacity of meso-CuBTC at 3MPa was reduced to 27% of that of micro-CuBTCs. Consequently, meso-CuBTC shows a higher CO2/CH4 selectivity compared to micro-CuBTC. It was also found that the selectivity of the CuBTCs could be enhanced by lowering the partial pressure of CO2. This was ascribed to the larger abatement of the adsorption capacity for CH4 than for CO2, resulting from a reduction of the interaction of CH4 with the surface of pores of meso-CuBTC of which the pore size had been augmented.

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