Acylamido-Based Anion-Functionalized Ionic Liquids for Efficient SO2 Capture through Multiple-Site Interactions

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• 作者：Guokai Cui ; Fengtao Zhang ; Xiuyuan Zhou ; Yanjie Huang ; Xiaopeng Xuan ; Jianji Wang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：September 8, 2015
• 年：2015
• 卷：3
• 期：9
• 页码：2264-2270
• 全文大小：376K
• ISSN：2168-0485

文摘

Acid gases such as SO₂ can be absorbed by ionic liquids (ILs) because of their unique properties. In this work, we developed a new approach for improving SO₂ absorption by novel acylamido-based anion-functionalized ILs. Several kinds of such ILs with different structures of acylamido group (anionic acylamide) were designed, prepared, and used for efficient capture of SO₂. It was shown that these acylamido-based ILs strongly interacted with SO₂, resulting in a very high SO₂ capacity up to 鈭?.5 mol SO₂ per mole of IL. The interactions between acylamido-based ILs and SO₂ were investigated by FT-IR, NMR, and quantum chemical calculations. It was found that the dramatic enhancement of SO₂ absorption capacity was originated from the multiple-site interactions such as N路路路S and C鈺怬路路路S interactions between the anion and SO₂. Furthermore, the captured SO₂ was easy to release by heating or bubbling N₂ through the SO₂-saturated ILs. This novel strategy provides an excellent alternative to current SO₂ capture technologies.