Highly Efficient CO<sub>2</sub> Capture by Imidazolium Ionic Liquids through a Reduction in the Formation of the Carbene–CO<sub>2</sub> Complex

Mei, Ke; He, Xi; Chen, Kaihong; Zhou, Xiuyuan; Li, Haoran; Wang, Congmin

doi:10.1021/acs.iecr.7b01001

Cited by 24 publications

(19 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Imidazolium carbene has drawn significant attention due to its multifunctional application. On the one hand, the electrogenerated imidazolium carbene can serve as an active organic species to capture CO 2 and yield imidazolium carbene–CO 2 adduct ([Emim + –CO 2 – ]) through a coupling reaction between carbene and CO 2 as described in eq . − This reaction takes place in CO 2 -saturated [Bmim][BF 4 ] electrolysis cell on glassy carbon and several different metallic electrodes. In the comparison of the voltammograms with or without CO 2 , due to the formation of imidazolium carbene–CO 2 adduct ([Emim + –CO 2 – ]), the oxidation current corresponding to the oxidation of imidazolium carbene back to the initial imidazolium cation is diminished because most of the imidazolium carbene has been used up by CO 2 coupling reaction .…”

Section: Results and Discussionmentioning

confidence: 99%

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

et al. 2020

View full text Add to dashboard Cite

Ionic liquids (ILs) are thermally stable at both high and low temperatures, making them excellent solvents and electrolytes in extreme ambient conditions. In this work, we systematically studied the temperature effects on the various pathways of electrochemical reduction of CO 2 in 1-ethyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim]-[NTf 2 ]) and compared them with those in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([Bmpy][NTf 2 ]) by electrochemical methods and density functional calculations. We summarize the crucial factors determining the reaction pathways for electroreduction of CO 2 in [Emim][NTf 2 ]. Our results show that temperature can be used to modulate the reaction pathway of electrochemical reduction of carbon dioxide in this imidazolium-based IL via the effects on (i) the mass transport of the reactant and intermediates, (ii) the adsorption and solubility of the intermediates species, and (iii) the IL−electrode interface structure and properties.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Then, [BMIm][OAc] was added into this system as solvent, because it could reduce the viscosity and enhance CO 2 capture at the same time . To our surprise, this kind of mixed IL lost its weight during CO 2 capture, because [BMIm][OAc] was unstable at high temperature in the presence of base . Finally, [Li(TEG)][Tf 2 N] and [Li(TTEG)][Tf 2 N] were added as solvents, which could dissolve CO 2 physically, due to the weak interaction between O and CO 2 .…”

Section: Resultsmentioning

confidence: 99%

Efficient capture of CO₂from flue gas at high temperature by tunable polyamine‐based hybrid ionic liquids

et al. 2019

Self Cite

View full text Add to dashboard Cite

For an ideal absorbent for CO 2 capture from flue gas, there are some key features including easy preparation, high stability, low absorption enthalpy, high capacity at high temperature and excellent reversibility. Herein, several polyamine-functionalized ionic liquids (ILs) were easily prepared from cheap polyamines and lithium salts, which exhibited significantly improved stability due to the presence of multisite coordinating interactions. The viscosity was reduced by introducing polyalcohol-based ILs, leading to polyamine-based hybrid ILs. Interestingly, these polyamine-based hybrid ILs exhibited high CO 2 capacity (4.09 mmol/g, 0.1 bar) at high temperature (80 C) and excellent reversibility in the presence of H 2 O and O 2 , which is superior to many other good absorbents. Moreover, these ILs also showed good performance for CO 2 capture from stimulated air (2.10 mmol/g, 380 ppm). We believe that this method with easy preparation, low cost, high efficiency and excellent reversibility has a great potential in the industrial capture of CO 2 from flue gas.

show abstract

“…However, the lower cost of carbon capture using ILs can be achieved by decreasing manufacturing cost due to the increased demand and improving the efficiency in both capture and regeneration stages, decreasing the energy requirements. The price/performance ratio of ILs is then a key to compete with existing commercial solvents, taking into account that the tunability property of ILs can provide an extra degree of freedom for designing solvents [15]. Moreover, the high viscosity of the majority of ILs because of their ionic nature, leads to slow CO 2 diffusion through the bulk IL, increasing the operational time requirements.…”

Section: Introductionmentioning

confidence: 99%

CO2 Desorption Performance from Imidazolium Ionic Liquids by Membrane Vacuum Regeneration Technology

et al. 2020

View full text Add to dashboard Cite

In this work, the membrane vacuum regeneration (MVR) process was considered as a promising technology for solvent regeneration in post-combustion CO2 capture and utilization (CCU) since high purity CO2 is needed for a technical valorization approach. First, a desorption test by MVR using polypropylene hollow fiber membrane contactor (PP-HFMC) was carried out in order to evaluate the behavior of physical and physico-chemical absorbents in terms of CO2 solubility and regeneration efficiency. The ionic liquid 1-ethyl-3-methylimidazolium acetate, [emim][Ac], was presented as a suitable alternative to conventional amine-based absorbents. Then, a rigorous two-dimensional mathematical model of the MVR process in a HFMC was developed based on a pseudo-steady-state to understand the influence of the solvent regeneration process in the absorption–desorption process. CO2 absorption–desorption experiments in PP-HFMC at different operating conditions for desorption, varying vacuum pressure and temperature, were used for model validation. Results showed that MVR efficiency increased from 3% at room temperature and 500 mbar to 95% at 310K and 40 mbar vacuum. Moreover, model deviation studies were carried out using sensitivity analysis of Henry’s constant and pre-exponential factor of chemical interaction, thus as to contribute to the knowledge in further works.

show abstract

Highly Efficient CO₂ Capture by Imidazolium Ionic Liquids through a Reduction in the Formation of the Carbene–CO₂ Complex

Cited by 24 publications

References 44 publications

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Efficient capture of CO₂from flue gas at high temperature by tunable polyamine‐based hybrid ionic liquids

CO2 Desorption Performance from Imidazolium Ionic Liquids by Membrane Vacuum Regeneration Technology

Contact Info

Product

Resources

About

Highly Efficient CO2 Capture by Imidazolium Ionic Liquids through a Reduction in the Formation of the Carbene–CO2 Complex

Cited by 24 publications

References 44 publications

Temperature Effects on CO2 Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Temperature Effects on CO2 Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Efficient capture of CO2from flue gas at high temperature by tunable polyamine‐based hybrid ionic liquids

CO2 Desorption Performance from Imidazolium Ionic Liquids by Membrane Vacuum Regeneration Technology

Contact Info

Product

Resources

About

Highly Efficient CO₂ Capture by Imidazolium Ionic Liquids through a Reduction in the Formation of the Carbene–CO₂ Complex

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Temperature Effects on CO₂ Electroreduction Pathways in an Imidazolium-Based Ionic Liquid on Pt Electrode

Efficient capture of CO₂from flue gas at high temperature by tunable polyamine‐based hybrid ionic liquids