Highly efficient and reversible SO2 capture by tunable azole-based ionic liquids through multiple-site chemical absorption

Congmin Wang; Guokai Cui; Xiaoyan Luo; Yingjie Xu; Haoran Li; Sheng Dai

doi:10.1021/ja204808h

Highly efficient and reversible SO2 capture by tunable azole-based ionic liquids through multiple-site chemical absorption

J Am Chem Soc. 2011 Aug 10;133(31):11916-9. doi: 10.1021/ja204808h. Epub 2011 Jul 15.

Authors

Congmin Wang¹, Guokai Cui, Xiaoyan Luo, Yingjie Xu, Haoran Li, Sheng Dai

Affiliation

¹ Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. chewcm@zju.edu.cn

PMID: 21751802
DOI: 10.1021/ja204808h

Abstract

A novel strategy for SO(2) capture through multiple-site absorption in the anion of several azole-based ionic liquids is reported. An extremely high capacity of SO(2) (>3.5 mol/mol) and excellent reversibility (28 recycles) were achieved by tuning the interaction between the basic anion and acidic SO(2). Spectroscopic investigations and quantum-mechanical calculations showed that such high SO(2) capacity originates from the multiple sites of interaction between the anion and SO(2). 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.