Effects of alkali-metal carbonates and nitrates on the CO2 sorption and regeneration of MgO-based sorbents at intermediate temperatures

IF 3.2 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY Korean Journal of Chemical Engineering Pub Date : 2016-08-04 DOI:10.1007/s11814-016-0185-4

Soo Chool Lee, Su Ho Cha, Yong Mok Kwon, Myung Gon Park, Byung Wook Hwang, Yong Ki Park, Hwi Min Seo, Jae Chang Kim

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引用次数: 21

Abstract

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 °C. The CO₂ capture capacities of the MgO-based sorbents promoted with Na₂CO₃ and K₂CO₃ were 9.7 and 45.0 mg 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 °C 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.

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碱金属碳酸盐和硝酸盐对ngo基吸附剂中温CO2吸附和再生的影响

在300 ~ 450℃的中间温度范围内，研究了在10 vol% CO2和10 vol% H2O存在下，碱金属碳酸盐和硝酸盐对mgo基吸附剂CO2吸附和再生的影响。Na2CO3和K2CO3对mgo基吸附剂的CO2捕集量分别为9.7和45.0 mg CO2/g。另一方面，Na2CO3和NaNO3共同促进的mgo基吸附剂在200°C、10 vol% CO2条件下的CO2捕集量最高，为97.4mg CO2/g，几乎是Na2CO3促进的mgo基吸附剂的10倍。由于碱金属碳酸盐和碱金属硝酸盐的共晶反应形成Na2Mg(CO3)2或K2Mg(CO3)2，这些吸附剂的CO2吸附剂的吸附速率高于碱金属硝酸盐促进的mgo基吸附剂。此外，用碱金属碳酸盐和硝酸盐浸渍MgO，完全解决了沉淀法所得双盐吸附剂的再现性问题。此外，我们发现由于再生过程中的共晶反应，它们的脱附温度低于碱金属碳酸盐促进的mgo基吸附剂。

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来源期刊

Korean Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

4.60

自引率

11.10%

发文量

310

审稿时长

4.7 months

期刊介绍： The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.