NMR Study of Carbon Dioxide Absorption in Aqueous Potassium Carbonate and Homopiperazine Blend

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• 作者：Youngeun Kim ; Jeongho Choi ; Sungchan Nam ; Soonkwan Jeong ; Yeoil Yoon
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：February 16, 2012
• 年：2012
• 卷：26
• 期：2
• 页码：1449-1458
• 全文大小：503K
• 年卷期：v.26,no.2(February 16, 2012)
• ISSN：1520-5029

文摘

This study focuses on identifying the CO₂ absorption mechanism in an aqueous potassium carbonate (K₂CO₃)/homopiperazine (homoPZ) solution, at various CO₂ loading. ¹H nuclear magnetic resonance (NMR) and ¹³C NMR measurements were conducted at 295 K within the absorbent concentration of homoPZ 7.5 wt % and K₂CO₃ 15 wt %/homoPZ 7.5 wt %. The CO₂-loaded absorbents were prepared by using vapor鈥搇iquid equilibrium (VLE) apparatus at 333 K. The results show that the amount of carbamate and bicarbamate in the CO₂-loaded K₂CO₃/homoPZ solution was larger than in the homoPZ solution. The free homoPZ that is able to react with CO₂ increases in the aqueous K₂CO₃/homoPZ solution because the K₂CO₃ serves as a buffer. It was found that the NMR method can be used to determine the CO₂ absorption mechanism of the absorbents.