화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.33, No.12, 3448-3455, December, 2016
DOI10.1007/s11814-016-0185-4  Export Citation
Effects of alkali-metal carbonates and nitrates on the CO2 sorption and regeneration of MgO-based sorbents at intermediate temperatures
Soo Chool Lee, Su Ho Cha1, Yong Mok Kwon2, Myung Gon Park2, Byung Wook Hwang2, Yong Ki Park3, Hwi Min Seo3, and Jae Chang Kim2, †
  • Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea
  • 1Research & Development Division Energy Plant R&D Team, Hyundai Engineering & Construction Co., Ltd., Yongin-si 16891, Korea
  • 2Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Korea
  • 3Green Chemistry Division, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
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The effects of alkali-metal carbonates and nitrates on the CO2 sorption and regeneration of MgO-based sorbents were investigated in the presence of 10 vol% CO2 and 10 vol% H2O in an intermediate temperature range, 300 to 450 ℃. The CO2 capture capacities of the MgO-based sorbents promoted with Na2CO3 and K2CO3 were 9.7 and 45.0mg CO2/g sorbent, respectively. On the other hand, a MgO-based sorbent promoted with both Na2CO3 and NaNO3 exhibited the highest CO2 capture capacity of 97.4mg CO2/g sorbent at 200 oC in 10 vol% CO2, which was almost ten-times greater than that of the MgO-based sorbent promoted with Na2CO3. The CO2 sorption rate of these sorbents was higher than that of the MgO-based sorbents promoted with alkali-metal nitrates due to the formation of Na2Mg(CO3)2 or K2Mg(CO3)2 by the alkali-metal carbonate and the eutectic reaction of the alkali-metal nitrates. In addition, the reproducibility problem of double-salt sorbents obtained by the precipitation method was completely resolved by impregnating MgO with alkali-metal carbonates and nitrates. Furthermore, we found that their desorption temperatures are lower than those of the MgO-based sorbents promoted with alkali-metal carbonates due to the eutectic reaction during the regeneration process.
Keywords:Nitrate;MgO;CO2;Capture;Intermediate Temperature;Molten Salt
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