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In relation to this article, we declare that there is no conflict of interest.
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Received March 2, 2016
Accepted June 13, 2016
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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Regenerable potassium-based alumina sorbents prepared by CO2 thermal treatment for post-combustion carbon dioxide capture

Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Korea 1Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea 2Korea Electric Power Research Institute, Daejeon 34056, Korea
kjchang@knu.ac.kr
Korean Journal of Chemical Engineering, November 2016, 33(11), 3207-3215(9), 10.1007/s11814-016-0162-y
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Abstract

Potassium carbonate supported on alumina is used as a solid sorbent for CO2 capture at low temperatures. However, its CO2 capture capacity decreases immediately after the first cycle. This regeneration problem is due to the formation of the by-product [KAl(CO3)(OH)2] during CO2 sorption. To overcome this problem, a new regenerable potassium-based sorbent was fabricated by CO2 thermal treatment of sorbents prepared by the impregnation of δ-alumina with K2CO3 in the presence of 10 vol% CO2 and 10 vol% H2O. The CO2 capture capacities of the new regenerable sorbents were maintained over multiple CO2 sorption tests. These results can be explained by the fact that the sorbent prepared by CO2 thermal treatment did not form any by-product during CO2 sorption. Based on these results, we suggest that the regeneration properties of potassium-based sorbents using δ-alumina could be significantly improved by the use of the CO2 thermal treatment developed in this study.

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