| 초록 |
Different types of tertiary amines bearing nitrile functionality were synthesized, and their SO2 absorption/desorption abilities were evaluated and compared with those of amines bearing hydroxyl functionality. Absorption–desorption cycle experiments clearly demonstrate that the nitrile-functionalized amines are more efficient than the hydroxyl-functionalized amines in terms of absorption rate and recyclability. Computational calculations with DBEA and DBAPN revealed that DBEA bearing a hydroxyethyl group chemically interacts with SO2 through oxygen atom, forming an irreversible 1:1 zwitterionic compound with a covalently bound -OSO2- group. On the contrary, DBAPN bearing a nitrile group physically interacts with SO2 through the nitrogen and the hydrogen atoms of the two methylene groups adjacent to the amino and nitrile functionalities. |
