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Reversible Capture of SO 2 through Functionalized Ionic Liquids
Author(s) -
Yang Dezhong,
Hou Minqiang,
Ning Hui,
Ma Jun,
Kang Xinchen,
Zhang Jianling,
Han Buxing
Publication year - 2013
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300224
Subject(s) - ionic liquid , flue gas , imide , absorption (acoustics) , desorption , chemistry , ion , combustion , flue gas desulfurization , sorbent , work (physics) , chemical engineering , inorganic chemistry , adsorption , organic chemistry , materials science , thermodynamics , catalysis , engineering , composite material , physics
Emission of SO 2 in flue gas from the combustion of fossil fuels leads to severe environmental problems. Exploration of green and efficient methods to capture SO 2 is an interesting topic, especially at lower SO 2 partial pressures. In this work, ionic liquids (ILs) 1‐(2‐diethylaminoethyl)‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([Et 2 NEMim][Tf 2 N]) and 1‐(2‐diethylaminoethyl)‐3‐methylimidazolium tetrazolate ([Et 2 NEMim][Tetz]) were synthesized. The performances of the two ILs to capture SO 2 were studied under different conditions. It was demonstrated that the ILs were very efficient for SO 2 absorption. The [Et 2 NEMim][Tetz] IL designed in this work could absorb 0.47 g SO 2 g IL −1 at 0.0101 MPa SO 2 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 SO 2 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.