Current status of CO<sub>2</sub> capture with ionic liquids: Development and progress
<p dir="ltr">Global warming triggered by greenhouse gas (GHG) emissions, particularly carbon dioxide (CO<sub>2</sub>), significantly influences climate change and has become a common environmental issue recently. The current amine-based technologies (ABTs) for CO<sub&g...
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2023
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| Summary: | <p dir="ltr">Global warming triggered by greenhouse gas (GHG) emissions, particularly carbon dioxide (CO<sub>2</sub>), significantly influences climate change and has become a common environmental issue recently. The current amine-based technologies (ABTs) for CO<sub>2</sub> capture ( CAP<sub>CO2</sub> ) have high energy demand, low absorption, and desorption rates, and are less environmentally sustainable due to high emissions of volatile solvents. Therefore, the development of environmentally friendly CAP<sub>CO2</sub> materials and/or processes is a growing area of research. The utilization of ionic liquids (ILs) for CAP<sub>CO</sub><sub>2</sub> has recently attracted attention. The unique characteristics of ILs, such as their low vapor pressure and high affinity for CAP<sub>CO</sub><sub>2</sub> as well as their low volatility make them a viable substitute for the existing processes. This work provides a comprehensive overview of the accomplishments and challenges during the use of ILs for CAP<sub>CO</sub><sub>2</sub> . The Review also outlines the mechanisms of the CAP<sub>CO2</sub> with ILs at the molecular level, the properties of ILs, characterization of the CO<sub>2</sub>/IL systems, and the effect of operating conditions on CO<sub>2</sub> uptake (UP<sub>CO</sub><sub>2</sub>) capacity by ILs. It also emphasizes the impact of cations, anions, and functional groups on the solubility of CO<sub>2</sub> (( S<sub>CO2</sub> ) ) in ILs as well as the biodegradability and toxicity of ILs. Additionally, recent advances in IL membrane technology for the CAP<sub>CO</sub><sub>2</sub> processes are considered. Lastly, the contribution of molecular simulations to create and assess ILs was reviewed. Protic and aprotic ILs properties have shown outstanding efficiency of UP<sub>CO</sub><sub>2</sub> . The interactions between the anionic part of IL and CO<sub>2</sub> enhance the UP<sub>CO2</sub> and outperform the efficiency of traditional organic solvents. Functionalized ionic liquids (FUNILs) with tuned functional groups, supported ionic liquids membranes (SILMs) as well as reversible ionic liquids (RILs) have improved the efficiency of ILs as a promising CO<sub>2</sub> capturing process from industrial streams even under low CO<sub>2</sub> partial pressure. The relative importance of the chemical breakdown of the IL constituents (cation–anion interfacial structuring) during the CAP<sub>CO</sub><sub>2</sub> process at different operating temperatures is unclear, and more research in this area is required to better inform the design of new ILs. This review provides a proper/systematic guideline to help ILs manufacturers and engineers design high-capacity ILs for appropriate CAP<sub>CO2</sub>.</p><h2>Other Information</h2><p dir="ltr">Published in: Fuel<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.fuel.2023.128102" target="_blank">https://dx.doi.org/10.1016/j.fuel.2023.128102</a></p> |
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