Abstract
Protic ionic liquids have been regarded as promising materials to capture CO2, because they can be easily synthesized with an attractive capacity. In this work, we studied the CO2 absorption mechanism by protic ionic liquids (ILs) composed of diamino protic cations and azolide anions. Results of 1H nuclear magnetic resonance (NMR), 13C NMR, 2-D NMR and fourier-transform infrared (FTIR) spectroscopy tests indicated that CO2 reacted with the cations rather than with the anions. The possible reaction pathway between CO2 and azolide-based protic ILs is proposed, in which CO2 reacts with the primary amine group generated from the deprotonation of the cation by the azolide anion.
Highlights
In recent decades, the amount of carbon dioxide (CO2 ) accumulated in the air has reached unbelievable levels, which is viewed as the main contributor to global warming, causing severe environmental problems, such as the rising atmospheric temperature, intense heat waves and drought
Oncsik and co-authors reported on CO2 capture by diamino protic ionic liquids (DPILs) formed by N,N-dimethylethylenediamine (DMEDA) with azoles, including imidazole (Im), 1,2,4-triazole (Tz) and pyrazole (Py)
The values in parentheses are the molar absorption capacities of ILs. The capacities of these ILs were close to the values reported by Oncsik et al (Table S1), suggesting that the protic ILs used in our study were successfully prepared
Summary
The amount of carbon dioxide (CO2 ) accumulated in the air has reached unbelievable levels, which is viewed as the main contributor to global warming, causing severe environmental problems, such as the rising atmospheric temperature, intense heat waves and drought. Protic ILs [12,13,14] have been investigated to capture CO2 because they can be prepared and exhibit promising capacity. Oncsik and co-authors reported on CO2 capture by diamino protic ionic liquids (DPILs) formed by N,N-dimethylethylenediamine (DMEDA) with azoles, including imidazole (Im), 1,2,4-triazole (Tz) and pyrazole (Py). These DPILs showed a high gravimetric absorption capacity for CO2 [15]. The authors investigated CO2 absorption mechanisms of these DPILs. On the basis of NMR and FTIR results, they believed that CO2 reacted with anions, forming carbamate species, and CO2 did not react with the diamino cations.
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