NMR Techniques and Prediction Models for the Analysis of Species Formed in CO₂ Capture Processes with Amine-Based Sorbents: A Critical Review

Abstract

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Highly Efficient Absorption of CO2 by Protic Ionic Liquids-Amine Blends at High Temperatures

“… 48 In contrast, two peaks at 166.83 and 162.93 ppm were observed after CO 2 absorption in [DMAPAH][OAc]-EDA-H 2 O (20 wt %), the former attributed to carbonyl carbon in carbamate and the latter due to bicarbonate formation. 49 − 51 These results are in good agreement with FTIR.…”

Heterogeneous catalysts for CO2hydrogenation to formic acid/formate: from nanoscale to single atom

“…Likewise, the combined utilization of organic amine bases with water will give rise to a complex amine-water-CO 2 system comprising bicarbonate, carbonate, and carbamate. The speciation analysis of these components in various amine-CO 2 systems has been recently summarized in a review by Hu et al 70 Moreover, it should be noted that CO 2 and its derived species exhibit different reactivity towards being reduced to formate. For instance, a TON of 6414 was obtained over a Pd nanocatalyst (Pd/C 3 N 4 ) by using KHCO 3 as the carbon source and base in 3 h, whereas the TON was sharply decreased to 866 upon using CO 2 as the carbon source in the absence of KHCO 3 .…”

Recent Advances in the Chemistry of Metal Carbamates

“…Many reactions involving amines and CO 2 have been performed in water, where the competition between the formation of the carbamato species and that of carbonate/bicarbonate anions must be taken into account ( Scheme 2 ). Despite this complication, kinetic and thermodynamic aspects have been widely investigated [ 35 , 50 , 51 ], also in view of the search for optimal substrates and conditions for industrial CO 2 capture.…”