Tuning the Basicity of Cyano‐Containing Ionic Liquids to Improve SO2 Capture through Cyano–Sulfur Interactions |
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| Authors: | Dr Guokai Cui Fengtao Zhang Xiuyuan Zhou Prof Haoran Li Prof Jianji Wang Prof Congmin Wang |
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| Affiliation: | 1. Collaborative Innovation Center of Henan Province for Green, Manufacturing of Fine Chemicals, Key Laboratory of Green, Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007 (P. R. China);2. Department of Chemistry, ZJU‐NHU United R&D Center, Zhejiang University, Hangzhou 310027 (P. R. China) |
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| Abstract: | A new approach has been developed to improve SO2 sorption by cyano‐containing ionic liquids (ILs) through tuning the basicity of ILs and cyano–sulfur interaction. Several kinds of cyano‐containing ILs with different basicity were designed, prepared, and used for SO2 capture. The interaction between these cyano‐containing ILs and SO2 was investigated by FTIR and NMR methods. Spectroscopic investigations and quantum chemical calculations showed that dramatic effects on SO2 capacity originate from the basicity of the ILs and enhanced cyano–sulfur interaction. Furthermore, the captured SO2 was easy to release by heating or bubbling N2 through the ILs. This efficient and reversible process, achieved by tuning the basicity of ILs, is an excellent alternative to current technologies for SO2 capture. |
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| Keywords: | basicity ionic liquids sorption sulfur dioxide sustainable chemistry |
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