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

Rahimi, Maryam; Catalini, Giulia; Puccini, Monica; Hatton, T. Alan

doi:10.1039/d0ra02450c

Cited by 53 publications

(64 citation statements)

References 48 publications

(72 reference statements)

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“…Anyway, more elaborated pH swing strategies could be tested in the future. [38] EG/KOH/BA. During the CO2-release test by acidification, we noted that if boric acid (BA) was used, there was no precipitation of the corresponding salt, namely potassium tetrahydroxyborate, during the effervescence and the resulting solution appeared not only homogeneous, but also less viscous than the initial EG/KOH 3:1 mixture.…”

Section: Resultsmentioning

confidence: 99%

Low-cost temperature transition mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents

Costamagna

Micheli

Canale³

et al. 2021

Journal of Molecular Liquids

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Section: Resultsmentioning

confidence: 99%

Low-cost temperature transition mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents

Costamagna

Micheli

Canale³

et al. 2021

Journal of Molecular Liquids

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“…Anyway, more elaborated pH swing strategies could be tested in the future. [40] EG/KOH/BA. During the CO2-release test by acidification, we noted that if boric acid (BA) was used, there was no precipitation of the corresponding salt, namely potassium tetrahydroxyborate, during the effervescence and the resulting solution appeared not only homogeneous, but also less viscous than the initial EG/KOH 3:1 mixture.…”

Section: Resultsmentioning

confidence: 99%

Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

Costamagna¹,

Micheli²,

Canale³

et al. 2021

Preprint

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A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO2 sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity via Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H2O 3:1:1:3 can absorb 24 gCO2/kgsorbent in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 gCO2/kgsorbent in 30 minutes at high pressure (10 and 20 atm, 80 gCO2/kgsorbent after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N2 flow. The system is robust enough to ensure multiple absorption/desorption cycles.

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“…This work showed not only the effective CO 2 separation via pH modulation with reversible MnO 2 protonation, but also the practical feasibility of this system by the development of a thermodynamic model integrating a K 2 CO 3 -based CO 2 absorption and electrochemically mediated pH swing ( Figures 2 B and 2C). Bench-scale experiments with this system were also demonstrated, focusing on the continuous desorption of CO 2 from a K 2 CO 3 solution ( Rahimi et al., 2020b ). Overall, the PCET process is still in the early stages of development, and the low stability of the organic proton carriers or redox electrodes is the current limiting issue.…”

Section: Electrochemical Gas Separationmentioning

confidence: 99%

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

Abstract: A bench-scale demonstration of CO2 capture from industrial flue gas with an electrochemically driven proton concentration process was demonstrated.

Cited by 53 publications

References 48 publications

Low-cost temperature transition mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents

Low-cost temperature transition mixtures (TTM) based on ethylene glycol/potassium hydroxide as reversible CO2 sorbents

Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

Perspective and challenges in electrochemical approaches for reactive CO2 separations

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