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Issue 4, 2015
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Improving SO2 capture by tuning functional groups on the cation of pyridinium-based ionic liquids

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Abstract

In this work, three kinds of novel functionalized ionic liquids (ILs) [NEt2C2Py][SCN], [C4OPy][SCN] and [C4CNPy][SCN] were developed by introducing a tertiary amino group, ether group and nitrile group on the pyridinium cation to improve SO2 absorption performances. Among the investigated ILs, [NEt2C2Py][SCN] showed the highest absorption capacity of 1.06 gSO2 gIL−1 under ambient conditions due to a combination of chemical and physical absorption. By contrast, the enhancement in SO2 capacity by [C4CNPy][SCN] and [C4OPy][SCN] is mainly ascribed to the stronger physical interaction between ILs and SO2 than the conventional IL [C4Py][SCN]. Meanwhile, higher SO2/CO2 selectivity was also obtained using these functionalized ILs, which was increased up to 41% comparing with that of [C4Py][SCN]. Moreover, the effect of water on SO2 capacity and the absorption mechanism were studied. The results indicated that the presence of water caused a slight decrease in SO2 capacity of [C4CNPy][SCN] and [C4OPy][SCN] because of physical absorption, whereas a slight increase in SO2 capacity by [NEt2C2Py][SCN] due to the formation of hydrogen sulfite salts through chemical absorption. In addition, three kinds of cation-functionalized ILs could remain the stable absorption performance after five cycles of absorption and desorption, implying these ILs show great potentials for SO2 capture.

Graphical abstract: Improving SO2 capture by tuning functional groups on the cation of pyridinium-based ionic liquids

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Supplementary files

Article information


Submitted
30 Oct 2014
Accepted
01 Dec 2014
First published
02 Dec 2014

RSC Adv., 2015,5, 2470-2478
Article type
Paper
Author version available

Improving SO2 capture by tuning functional groups on the cation of pyridinium-based ionic liquids

S. Zeng, H. He, H. Gao, X. Zhang, J. Wang, Y. Huang and S. Zhang, RSC Adv., 2015, 5, 2470
DOI: 10.1039/C4RA13469A

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