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Received August 4, 2021
Accepted September 29, 2021
- 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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Influence of the sorption pressure and K2CO3 loading of a MgO-based sorbent for application to the SEWGS process
Do Yeong Ryu1 2
Seongbin Jo3
Tae-Young Kim1 4
Soo Yeong1 4
Jae Kuk Kim2
Jae Eun Hwang2
Jae Chang Kim1 4†
Soo Chool Lee5†
1Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Korea 2JnK Co., Ltd, Daegu 41566, Korea 3Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, California 92521, United States, USA 4, Korea 5Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea
kjchang@knu.ac.kr
Korean Journal of Chemical Engineering, April 2022, 39(4), 1028-1035(8), 10.1007/s11814-021-0967-1
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Abstract
MgO-based sorbents were prepared by impregnation with K2CO3 at different loadings. This study examined the CO2 absorption and regeneration properties of MgO-based sorbents at various pressures. The CO2 capture capacity of the PMI-30 sorbent increased to 204.4mg CO2/g sorbent with increasing absorption pressure through CO2 absorption by MgO itself and K2CO3 by generating structures, such as MgCO3·3H2O and K2Mg(CO3)2. However, no KHCO3 phase was observed after CO2 absorption at 1, 10, and 20 atm. The CO2 capture capacity of the MgO and PMI-10, 20, 30, and 40 sorbents was the 94.6, 129.9, 156.6, 204.4, and 239.4mg CO2/g sorbent, respectively. The CO2 capture capacity of MgO in the PMI sorbent was relatively constant regardless of the decreasing MgO content and increasing K2CO3 content. The CO2 absorption ability of MgO was calculated by substracting theoretical CO2 capture capacity of K2CO3 from the total capacity of sorbents. The TPD experiment performed at 1 atm after CO2 absorption at 20 atm showed that the regeneration temperature of the PMI sorbents differed according to the K2CO3 loading.
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