| Autor: |
Sun, Cheng, Wen, Shujing, Zhao, Jingkai, Zhao, Chongjian, Li, Wei, Li, Sujing, Zhang, Dongxiao |
| Zdroj: |
Energy & Fuels; 20240101, Issue: Preprints |
| Abstrakt: |
In this work, the blends of 1-hydroxyethyl-3-methylimidazolium glycine ([C2OHmim][Gly]) synthesized by our laboratory and N-methyldiethanolamine (MDEA) in aqueous solution were prepared for CO2capture, and the maximum absorption performance of the blends was obtained at the mole ratio of 8:2 of MDEA/[C2OHmim][Gly] with a total concentration of 1.0 mol L–1. CO2loading of the blended absorbent was less adversely influenced by the temperature and O2concentration than that of MDEA aqueous, and it had a good performance in regeneration ability. The reaction mechanism of the CO2absorption in MDEA/[C2OHmim][Gly] was investigated by 13C nuclear magnetic resonance. CO2first reacted with [C2OHmim][Gly] to form carbamate, and then carbamate promoted the reaction between CO2and MDEA, which could be described as a shuttle mechanism. The kinetics of CO2absorption was investigated in a double stirred-cell absorber at different temperatures, and some important kinetic parameters were obtained, such as the reaction rate constant (k2) and the overall rate constant (kov). Experimental results indicated that the addition of [C2OHmim][Gly] enhanced CO2absorption of MDEA under low CO2partial pressure, which could improve the application of MDEA in industry. |
| Databáze: |
Supplemental Index |
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