title: Nitrile-functionalized tertiary amines as highly efficient and reversible SO2 absorbents.
abstract: Three different types of nitrile-functionalized amines, including 3-(N,N-diethylamino)propionitrile (DEAPN), 3-(N,N-dibutylamino)propionitrile (DBAPN), and N-methyl-N,N-dipropionitrile amine (MADPN) were synthesized, and their SO2 absorption performances were evaluated and compared with those of hydroxy-functionalized amines such as N,N-diethyl-N-ethanol amine (DEEA), N,N-dibutyl-N-ethanol amine (DBEA), and N-methyl-N,N-diethanol amine (MDEA). Absorption-desorption cycle experiments clearly demonstrate that the nitrile-functionalized amines are more efficient than the hydroxy-functionalized amines in terms of absorption rate and regenerability. Computational calculations with DBEA and DBAPN revealed that DBEA bearing a hydroxyethyl group chemically interacts with SO2 through oxygen atom, forming an ionic 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.
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Sung Yun
authors.initials: SY
authors.lastname: Hong
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Heehwan
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Junkyo
authors.initials: J
authors.lastname: Jeong
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Minserk
authors.initials: M
authors.lastname: Cheong
authors.affiliation: Clean Energy Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
authors.forename: Hyunjoo
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea. Electronic address: khs2004@khu.ac.kr.
authors.forename: Hoon Sik
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea. Electronic address: leejs70@khu.ac.kr.
authors.forename: Je Seung
authors.initials: JS
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000302:isolation & purification*
chemical_list: D000588:Amines; D009570:Nitriles; D013458:Sulfur Dioxide
keywords: Absorbent; Amine; Nitrile; Recycle; SO(2)