title: Kinetics and mechanism of carbamate formation from CO2(aq), carbonate species, and monoethanolamine in aqueous solution.
abstract: Removal of carbon dioxide from fossil-based power generation is a potentially useful technique for the reduction of greenhouse gas emissions. Reversible interaction with aqueous amine solutions is most promising. In this process, the formation of carbamates is an important reaction of carbon dioxide. In this contribution, a detailed molecular reaction mechanism for the carbamate formation between MEA (monoethanolamine) and dissolved CO(2) as well as carbonate species in aqueous solution is presented. There are three parallel, reversible reactions of the free amine with CO(2), carbonic acid, and the bicarbonate ion; the relative importance of the three paths is strongly pH dependent. Kinetic and equilibrium measurements are based on (1)H NMR and stopped-flow measurements with rate constants, equilibrium constants, and protonation constants being reported.
authors.affiliation: Department of Chemistry, The University of Newcastle, Newcastle NSW 2308, Australia.
authors.forename: Nichola
authors.initials: N
authors.lastname: McCann
authors.forename: Duong
authors.initials: D
authors.lastname: Phan
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Wang
authors.forename: William
authors.initials: W
authors.lastname: Conway
authors.forename: Robert
authors.initials: R
authors.lastname: Burns
authors.forename: Moetaz
authors.initials: M
authors.lastname: Attalla
authors.forename: Graeme
authors.initials: G
authors.lastname: Puxty
authors.forename: Marcel
authors.initials: M
authors.lastname: Maeder