Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture

Wang, Miao; Hariharan, Subrahmaniam; Shaw, Ryan; Hatton, T. Alan

doi:10.1016/j.ijggc.2018.12.028

Cited by 84 publications

(115 citation statements)

References 19 publications

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“…20). The electrical energy consumption of this capture-release process was calculated to be ~56 kJ mol −1 CO 2 (Supplementary Note 2), which is on par with other carbon capture systems 44 . A more detailed energetic analysis of quinone-mediated carbon capture in a conventional electrolyte can be found in a recent literature 16 .…”

Section: Resultsmentioning

confidence: 97%

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

et al. 2020

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Carbon capture is essential for mitigating carbon dioxide emissions. Compared to conventional chemical scrubbing, electrochemically mediated carbon capture utilizing redox-active sorbents such as quinones is emerging as a more versatile and economical alternative. However, the practicality of such systems is hindered by the requirement of toxic, flammable organic electrolytes or often costly ionic liquids. Herein, we demonstrate that rationally designed aqueous electrolytes with high salt concentration can effectively resolve the incompatibility between aqueous environments and quinone electrochemistry for carbon capture, eliminating the safety, toxicity, and at least partially the cost concerns in previous studies. Salt-concentrated aqueous media also offer distinct advantages including extended electrochemical window, high carbon dioxide activity, significantly reduced evaporative loss and material dissolution, and importantly, greatly suppressed competing reactions including under simulated flue gas. Correspondingly, we achieve continuous carbon capture-release operations with outstanding capacity, stability, efficiency and electrokinetics, advancing electrochemical carbon separation further towards practical applications.

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Section: Resultsmentioning

confidence: 97%

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

et al. 2020

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“…Once CO 2 is removed from the solution, the Cu 2+ is plated out onto the cathode and the solution is ready to be used again. Thermodynamic analysis of this process indicates that the energy requirement for regeneration is approximately ∼35–40 kJ/mol CO 2 ( Wang et al., 2019 , 2020 ), which is comparable to the energy requirement of thermal swing processes using monoethanolamine, MEA (40 kJ/mol CO 2 ), and piperazine (38 kJ/mol CO 2 ). The true advantage of the EMAR system is its “plug-and-play” nature.…”

Section: Electrochemically Mediated Co 2 Separationmentioning

confidence: 83%

Perspective and challenges in electrochemical approaches for reactive CO2 separations

Gurkan

Klemm

et al. 2021

iScience

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Summary The desire toward decarbonization and renewable energy has sparked research interests in reactive CO 2 separations, such as direct air capture that utilize electricity as opposed to conventional thermal and pressure swing processes, which are energy-intensive, cost-prohibitive, and fossil-fuel dependent. Although the electrochemical approaches in CO 2 capture that support negative emissions technologies are promising in terms of modularity, smaller footprint, mild reaction conditions, and possibility to integrate into conversion processes, their practice depends on the wider availability of renewable electricity. This perspective discusses key advances made in electrolytes and electrodes with redox-active moieties that reversibly capture CO 2 or facilitate its transport from a CO 2 -rich side to a CO 2 -lean side within the last decade. In support of the discovery of new heterogeneous electrode materials and electrolytes with redox carriers, the role of computational chemistry is also discussed.

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“…The source of inefficiency might be due to the re-absorption of the desorbed gas by the electrolyte, as predicted in our previous investigation. 16 During the desorption, CO 2 loading (dened as C CO2 / C CO2_initial ) decreased and reached the nal value of $0.6, indicating $80% desorption of the initially absorbed CO 2 by the K 2 CO 3 absorbent during the electrochemical process. It should be noted that a CO 2 loading of 0.5 indicates 100% desorption, as half of the total initial CO 2 was introduced by the K 2 CO 3 absorbent.…”

Section: Continuous Co 2 Desorptionmentioning

confidence: 95%

“…Every one hour, the CO 2 content of the anolyte was measured with a titration method that we previously developed. 16 The amount of CO 2 desorbed was calculated by subtraction of the CO 2 content at a given time from the initial content. The experiment started with the same electrolyte for the anolyte and catholyte, containing 0.5 M K 2 CO 3 absorbent and 0.5 M KCl as the supporting electrolyte.…”

Section: Flow Cell Conguration and Operationmentioning

confidence: 99%

“…6,8,9 Although quinone-based nucleophiles have been widely studied, [8][9][10][11] other organic compounds such as bipyridine 12 and thiolates 13 have also been investigated. Other electrochemical approaches have recently been emerged, including electrochemically mediated amine regeneration [14][15][16][17] and membrane capacitive deionization. 18,19 These systems offer potentially lower energy consumption for CO 2 capture and have led to a growing interest in using electrochemical processes as a promising alternative separation technique.…”

Section: Introductionmentioning

confidence: 99%

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Bench-scale demonstration of CO₂ capture with an electrochemically driven proton concentration process

et al. 2020

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Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture

Cited by 84 publications

References 19 publications

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

Perspective and challenges in electrochemical approaches for reactive CO2 separations

Bench-scale demonstration of CO₂ capture with an electrochemically driven proton concentration process

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Energetics of electrochemically mediated amine regeneration process for flue gas CO2 capture

Cited by 84 publications

References 19 publications

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

Electrochemically mediated carbon dioxide separation with quinone chemistry in salt-concentrated aqueous media

Perspective and challenges in electrochemical approaches for reactive CO2 separations

Bench-scale demonstration of CO2 capture with an electrochemically driven proton concentration process

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Bench-scale demonstration of CO₂ capture with an electrochemically driven proton concentration process