Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effects of Halide Anions to Absorb SO2 in Ionic Liquids

  • Lee, Ki-Young (Clean Energy Research Center, Korea Institute of Science and Technology) ;
  • Kim, Chang-Soo (Clean Energy Research Center, Korea Institute of Science and Technology) ;
  • Kim, Hong-Gon (Clean Energy Research Center, Korea Institute of Science and Technology) ;
  • Cheong, Min-Serk (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University) ;
  • Mukherjee, Deb Kumar (Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University) ;
  • Jung, Kwang-Deog (Clean Energy Research Center, Korea Institute of Science and Technology)
  • Received : 2010.01.19
  • 심사 : 2010.05.10
  • 발행 : 2010.07.20
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초록

Ionic liquids with halide anions were prepared and the dependency of halide anions on the $SO_2$ solubility of ILs was investigated. The study shows that the $SO_2$ solubility of ionic liquids lies in the range 1.91~2.22 $SO_2$/ILs mol ratio. $SO_2$ solubility in ionic liquids with varying halide anions follows the order Br > Cl > I. Theoretical investigation was also conducted at the B3LYP level using the Gaussian 03 program. From the theoretical consideration of the interaction between $SO_2$ and [EMIm]X (where X = Cl, Br, and I), it has been proposed that primary interaction of halide occurs with $C_2$-H of the imidazolium and S of $SO_2$. Experimental results further shows that the absorption and desorption process of $SO_2$ in ILs was reversible by the three cycles of the absorption at $50^{\circ}C$ and desorption at $140^{\circ}C$. The reversibility of $SO_2$ absorption was confirmed by FT-IR studies.

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