NMR Characterization of Carbon Dioxide Chemical Absorption with Monoethanolamine, Diethanolamine, and Triethanolamine

Abstract

The present work analyzes and compares the carbon dioxide absorption process in aqueous solutions of different amines (MEA, monoethanolamine; DEA, diethanolamine; TEA, triethanolamine). This study evaluates the influence of the reagents nature upon absorption using a semicontinuous regime in a bubble contactor. 13 C and 1 H nuclear magnetic resonance (NMR) spectroscopy has been used to analyze species (reagents and/or products) in the reaction medium. In this way, the influence of the amino group substitution degree and carbon dioxide loading upon the chemical absorption mechanism were analyzed.

An investigation of the role of N-methyl-diethanolamine in non-aqueous solution for CO2 capture process using 13C NMR spectroscopy

“…13 C NMR spectroscopy 13 C NMR spectroscopic analysis is an efficient tool which can be used to identify and evaluate the amount of different carboncontaining species during a chemical reaction (Hook, 1997;Barzagli et al, 2009Barzagli et al, , 2010Ciftja et al, 2013a,b;García-Abuín et al, 2013;Perinu et al, 2014).…”

An Iron Quaterpyridine Complex as Precursor for the Electrocatalytic Reduction of CO2 to Methane

“…The layer of Fe formed on the glassy carbons urfacep roved to reduce CO 2 to CH 4 even in very mild conditions (25 8C, 1atm pressure) with a FE for CH 4 that is analogous to the value reported by Hara et al [23] under 30 atm CO 2 in water at approximately the same potential. [24,25] Small amounts of this acid (its pK a value can be reasonably approximated to % 19 in CH 3 CN) [30] could also be involved in the CH 4 formation.W hen aC PE experiment was performed at E = À1.65 Vv s. SCE under CO atmosphere, no CH 4 was observed, confirming the fundamentalr ole that CO 2 could have in the generation of the protons ource. TEOA was essential for the productiono fm ethane even if its role remains to be further explored.…”

“…CH 4 was produced with af aradaic yield of approximately 2.1 %a t2 58Ca nd 1atm pressure of CO 2 as reactant. [24,25] Remarkably,I shitani and co-workers have recently reportedC O 2 insertion in a[ Re(bpy)(CO) 3 ] + /TEOA adduct, in dimethylformamide as solvent. reduction and protonation leads to CÀOb ond cleavage and formation of an Fe I (qpy)CO adduct.…”

CO2 Absorption and Regeneration Using Amines with Different Degrees of Steric Hindrance

“…The carbon dioxide absorption experiments finish with a slight decrease in absorption rate when the amine concentration tends to zero, and only physical absorption takes place. This behavior is clearly affected by the reaction mechanism corresponding to aqueous solutions of MEA [15]. The main reaction mechanism using aqueous solutions of MEA for chemical absorption of carbon dioxide is based on the production of carbamate.…”