title: Influence of additives including amine and hydroxyl groups on aqueous ammonia absorbent for CO2 capture.
abstract: Aqueous ammonia absorbent (10 wt %) was modified with four kinds of additives (1 wt %) including amine and hydroxyl groups, i.e., 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propandiol (AMPD), 2-amino-2-ethyl-1,3-propandiol (AEPD), and tri(hydroxymethyl) aminomethane (THAM), for CO(2) capture. The loss of ammonia by vaporization was reduced by additives, whereas the removal efficiency of CO(2) was slightly improved. These results were attributed to the interactions between ammonia and additives or absorbents and CO(2) via hydrogen bonding, as verified by FT-IR spectra and computational calculation. Molecular structures as well as binding energies were obtained from the geometries of (ammonia + additives) and (ammonia + additives + CO(2)) at the optimized state. These experimental and theoretical findings demonstrate that additives including amine and hydroxyl group are suitable for modifying aqueous ammonia absorbent for CO(2) removal.
authors.affiliation: Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea.
authors.forename: Jong Kyun
authors.initials: JK
authors.lastname: You
authors.forename: Hoseok
authors.initials: H
authors.lastname: Park
authors.forename: Seong Ho
authors.initials: SH
authors.lastname: Yang
authors.forename: Won Hi
authors.initials: WH
authors.lastname: Hong
authors.forename: Weonho
authors.initials: W
authors.lastname: Shin
authors.forename: Jeung Ku
authors.initials: JK
authors.lastname: Kang
authors.forename: Kwang Bok
authors.initials: KB
authors.lastname: Yi
authors.forename: Jong-Nam
authors.initials: JN
authors.lastname: Kim