Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemoon-gu, Seoul, Korea
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Clean Energy Research Center, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Sungbuk-gu, Seoul, Korea
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Energy Environ. Sci., 2011,4, 1802-1806
01 Nov 2010,
26 Feb 2011
First published online
24 Mar 2011
Room temperature ionic liquids (RTILs), ether-functionalized imidazoliummethanesulfonates, exhibit extremely high SO2 solubility, at least 2 moles of SO2 per mole of RTIL at 30 °C and at atmospheric pressure. The solubility of SO2 in these RTILs increases with increasing number of tethered etheroxygen atoms and also with the pressure rise. FT-IR spectroscopic and quantum mechanical calculation results show that such high SO2 solubility is originated from the combined interactions of SO2 with methanesulfonate anion and etheroxygen atom or atoms on the imidazolium ring. The absorbed SO2 gas can be readily and completely desorbed from the RTILs by heating at 100 °C in a N2 flow, thereby allowing the RTILs to be reused up to 5 cycles without loss of their initial capacity.
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Energy & Environmental Science
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