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Highly Efficient Absorption of CO2 by Protic Ionic Liquids-Amine Blends at High Temperatures
Cheng Li1, Tianxiang Zhao1, Anjie Yang1
1Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, P. R. China.
ACS Omega
|December 20, 2021
Summary
Developing effective carbon dioxide (CO2) absorbents is crucial. This study shows protic ionic liquid (PIL) and amine blends, particularly [DMAPAH][OAc] with ethanediamine (EDA), achieve high CO2 uptake, enhanced by water.
Area of Science:
- Environmental Chemistry
- Materials Science
- Chemical Engineering
Background:
- Growing environmental concerns necessitate advanced carbon dioxide (CO2) capture technologies.
- Protic ionic liquids (PILs) and amines are promising candidates for CO2 absorption.
Purpose of the Study:
- To investigate the CO2 absorption efficiency of PIL-amine blends.
- To optimize absorption conditions and understand the underlying mechanisms.
Main Methods:
- Measurement of density and viscosity for four PIL-amine mixtures.
- Systematic study of CO2 absorption under varying conditions (ratio, temperature, pressure, water content).
- Analysis of absorption mechanisms using FTIR and NMR spectroscopy.
Main Results:
- The 3-dimethylamino-1-propylamine acetate ([DMAPAH][OAc]) plus ethanediamine (EDA) mixture exhibited the highest CO2 uptake (0.295 g/g) at 50 °C and 1 bar.
- CO2 absorption increased to 0.299 g/g with 20% water content.
- Absorption mechanisms were elucidated through spectroscopic analysis.
Conclusions:
- PIL-amine blends offer efficient CO2 absorption capabilities.
- Water content significantly enhances CO2 uptake in these systems.
- The [DMAPAH][OAc] + EDA blend represents a highly effective CO2 absorbent.
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