title: Analysis of the CO2 and NH3 reaction in an aqueous solution by 2D IR COS: formation of bicarbonate and carbamate.
abstract: The two-dimensional (2D) infrared correlation spectra obtained from the reaction time- and concentration-dependent IR spectra elucidates the reaction of CO2 and NH3 in an aqueous solution for CO2 absorption. In the synchronous 2D correlation spectra, the interrelation of the proton with carbamate and bicarbonate indicates that the pH level affected the formation reactions of the two products. Furthermore, the interrelation of carbamate with bicarbonate confirmed the conversion of carbamate into bicarbonate with the release of protons (or the decrease of the pH). From the experimental results including the asynchronous 2D correlation spectra, the reaction of the CO2 and aqueous ammonia proceeded through the following steps: formation of carbamate, formation of bicarbonate, release of protons, and conversion of carbamate into bicarbonate. The analysis of the formation of carbamate and bicarbonate by 2D infrared correlation spectroscopy provides useful information on the reaction mechanism of CO2 and NH3 in aqueous solutions.
authors.affiliation: Department of Chemical and Biomolecular Engineering, BK21 Program, KAIST, Yusong-gu, Daejeon, Republic of Korea.
authors.forename: HoSeok
authors.initials: H
authors.lastname: Park
authors.forename: Young Mee
authors.initials: YM
authors.lastname: Jung
authors.forename: Jong Kyun
authors.initials: JK
authors.lastname: You
authors.forename: Won Hi
authors.initials: WH
authors.lastname: Hong
authors.forename: Jong-Nam
authors.initials: JN
authors.lastname: Kim