Analysis of the CO2 and NH3 Reaction in an Aqueous Solution by 2D IR COS: Formation of Bicarbonate a
June 29th, 2008 | by admin |Analysis of the CO2 and NH3 Reaction in an Aqueous Solution by 2D IR COS: Formation of Bicarbonate and Carbamate.
The two-dimensional (2D) infrared correlation spectra obtained from the reaction time- and concentration-dependent IR spectra elucidates the reaction of CO 2 and NH 3 in an aqueous solution for CO 2 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 CO 2 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 CO 2 and NH 3 in aqueous solutions.
Park H, Jung YM, You JK, Hong WH, Kim JN.
Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea whhong@kaist.ac.kr.