Journal
CHEMSUSCHEM
Volume 6, Issue 7, Pages 1191-1195Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300224
Keywords
absorption; green chemistry; ionic liquids; reversibility; sulfur dioxide
Funding
- National Natural Science Foundation of China [20903109, 21133009, U1232203, 21021003]
- Chinese Academy of Sciences [KJCX2.YW.H16]
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Emission of SO2 in flue gas from the combustion of fossil fuels leads to severe environmental problems. Exploration of green and efficient methods to capture SO2 is an interesting topic, especially at lower SO2 partial pressures. In this work, ionic liquids (ILs) 1-(2-diethylaminoethyl)-3-methylimidazolium bis( trifluoromethylsulfonyl)imide ([Et(2)NEMim][Tf2N]) and 1-(2-di-ethylaminoethyl)- 3-methylimidazolium tetrazolate ([Et2NEMim][ Tetz]) were synthesized. The performances of the two ILs to capture SO2 were studied under different conditions. It was demonstrated that the ILs were very efficient for SO2 absorption. The [Et(2)NEMim][Tetz] IL designed in this work could absorb 0.47 g(SO2) g(IL)(-1) at 0.0101 MPa SO2 partial pressure, which is the highest capacity reported to date under the same conditions. The main reason for the large capacity was that both the cation and the anion could capture SO2 chemically. In addition, the IL could easily be regenerated, and the very high absorption capacity and rapid absorption/desorption rates were not changed over five repeated cycles.
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