title: Absorption and desorption of SO2 in aqueous solutions of diamine-based molten salts.
abstract: SO2 absorption and desorption behaviors were investigated in aqueous solutions of diamine-derived molten salts with a tertiary amine group on the cation and a chloride anion, including butyl-(2-dimethylaminoethyl)-dimethylammonium chloride ([BTMEDA]Cl, pKb=8.2), 1-butyl-1,4-dimethylpiperazinium chloride ([BDMP]Cl, pKb=9.8), and 1-butyl-4-aza-1-azoniabicyclo[2,2,2]octane chloride ([BDABCO]Cl, pKb=11.1). The SO2 absorption and desorption performance of the molten salt were greatly affected by the basicity of the molten salt. Spectroscopic, X-ray crystallographic, and computational results for the interactions of SO2 with molten salts suggest that two types of SO2-containg species could be generated depending on the basicity of the unquaternized amino group: a dicationic species comprising two different anions, HSO3(-) and Cl(-), and a monocationic species bearing Cl(-) interacting with neutral H2SO3.
authors.affiliation: Clean Energy Center, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Republic of Korea; Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Seung Rok
authors.initials: SR
authors.lastname: Lim
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Junhyeok
authors.initials: J
authors.lastname: Hwang
authors.affiliation: Clean Energy Center, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Chang Soo
authors.initials: CS
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 1 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, Republic of Korea.
authors.forename: Ho Seok
authors.initials: HS
authors.lastname: Park
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
authors.forename: Minserk
authors.initials: M
authors.lastname: Cheong
authors.affiliation: Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 26, Kyungheedae-ro, 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: Clean Energy Center, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Republic of Korea. Electronic address: hjlee@kist.re.kr.
authors.forename: Hyunjoo
authors.initials: H
authors.lastname: Lee
mesh_terms: D003959:Diamines; D005740:Gases / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D012492:Salts; D012996:Solutions; D013059:Spectrum Analysis, Raman; D013458:Sulfur Dioxide / Q000737:chemistry* / Q000302:isolation & purification; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D003959:Diamines; D005740:Gases; D012492:Salts; D012996:Solutions; D014867:Water; D013458:Sulfur Dioxide
keywords: Absorbent; Amine; Molten salt; Reversibility; SO(2)