Highly Efficient and Reversible SO2 Capture by Tunable Azole-Based Ionic Liquids through Multiple-Site Chemical Absorption

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• 作者：Congmin Wang ; Guokai Cui ; Xiaoyan Luo ; Yingjie Xu ; Haoran Li ; Sheng Dai
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：August 10, 2011
• 年：2011
• 卷：133
• 期：31
• 页码：11916-11919
• 全文大小：760K
• 年卷期：v.133,no.31(August 10, 2011)
• ISSN：1520-5126

文摘

A novel strategy for SO₂ capture through multiple-site absorption in the anion of several azole-based ionic liquids is reported. An extremely high capacity of SO₂ (>3.5 mol/mol) and excellent reversibility (28 recycles) were achieved by tuning the interaction between the basic anion and acidic SO₂. Spectroscopic investigations and quantum-mechanical calculations showed that such high SO₂ capacity originates from the multiple sites of interaction between the anion and SO₂. These tunable azole-based ionic liquids with multiple sites offer significant improvements over commonly used absorbents, indicating the promise for industrial applications in acid gas separation.