期刊
KOREAN JOURNAL OF CHEMICAL ENGINEERING
卷 39, 期 4, 页码 1028-1035出版社
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-021-0967-1
关键词
CO2 capture; pre-combustion; K2CO3; MgO-based sorbent; K2Mg(CO3)(2)
资金
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20015460]
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2021M3I3 A1084502]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20015460] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the CO2 absorption and regeneration properties of MgO-based sorbents at different pressures. The results showed that increasing absorption pressure can enhance the CO2 capture capacity of the sorbents. The CO2 absorption ability of MgO was relatively constant, while the K2CO3 loading affected the regeneration temperature of the sorbents.
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 204.4 mg CO2/g sorbent with increasing absorption pressure through CO2 absorption by MgO itself and K2CO3 by generating structures, such as MgCO3 center dot 3H(2)O 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 239.4 mg 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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