Electrowinning-coupled CO2 capture with energy-efficient absorbent regeneration: Towards practical application

Wang, Changhong; Jiang, Ke; Jones, Timothy W.; Yang, Shenghai; Yu, Hai; Feron, Paul; Li, Kangkang

doi:10.1016/j.cej.2021.131981

Cited by 39 publications

(19 citation statements)

References 42 publications

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“…Carbon dioxide electrolyzers can produce carbon-neutral chemicals and fuels using CO 2 from the atmosphere and electricity from wind and solar resources. − To be industrially relevant, CO 2 electrolyzers must achieve high rates of product formation (i.e., current densities >100 mA cm –2 ) and low cell potentials (<3 V) while also efficiently utilizing the CO 2 reactant. , Gaseous CO 2 is often used as the feedstock for pilot-scale CO 2 electrolyzers because of its solubility and mass transfer advantages over CO 2 dissolved in water. − However, isolating pure CO 2 gas from point sources or the atmosphere is costly because a considerable energy penalty (i.e., 50–175 kJ mol –1 of CO 2 ) is required to liberate CO 2 from liquid sorbents used in CO 2 capture processes. − These collected CO 2 streams are also not often utilized efficiently in gas-fed CO 2 electrolyzers, − since a major fraction of the reacted CO 2 is converted into HCO 3 – and CO 3 2– (referred to here as (bi)carbonates) upon reacting with OH – produced at the cathode . These (bi)carbonates are inevitably converted back into CO 2 at the anode .…”

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confidence: 99%

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

et al. 2022

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Bicarbonate electrolyzers are devices designed to convert CO 2 captured from point sources or the atmosphere into chemicals and fuels without needing to first isolate pure CO 2 gas. We report here an experimentally validated model that quantifies the reaction chemistry and mass transfer processes within the catalyst layer and cation exchange membrane layer of a bicarbonate electrolyzer. Our results demonstrate that two distinct chemical microenvironments are key to forming CO at high rates: an acidic membrane layer that promotes in situ CO 2 formation and a basic catalyst layer that suppresses the hydrogen evolution reaction. We show that the rate of CO product formation can be increased by modulating the catalyst and membrane layer properties to increase the rate of in situ CO 2 generation and transport to the cathode. These insights serve to inform the design of bicarbonate and BPM-based CO 2 electrolyzers while demonstrating the value of modeling for resolving rate-determining processes in electrochemical systems.

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confidence: 99%

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

et al. 2022

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“…Investigations on the replenishment mechanism of the electrolyte and additives as well as economic estimations of the cost input and output return for crude Pb electrorefining in the Lugalvan BNO12-assisted MSA system are now being performed. The energetic performance and process design of electrorefining would be further improved by low-investment microkinetic modeling. − Preparation of novel electrodes with nano- and polymeric materials will further improve the electrochemical performance of the deposition process. − The continuous drop in price of renewable electricity would further advance electrorefining toward lower-cost operation. Overall, crude Pb electrorefining in the Lugalvan BNO12-assisted MSA system would operate in a more technically and economically beneficial mode once receiving reasonable optimizations of process and condition and hold great potential toward practical application.…”

Section: Discussionmentioning

confidence: 99%

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

XIANG

Zhu

Song

et al. 2022

ACS Sustainable Chem. Eng.

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The conventional electrorefining process of crude lead (Pb)�employing a bone glue (BG)-and calcium lignosulfonate (CL)synergistically assisted fluosilicic acid (H 2 SiF 6 ) system�suffers the undesired environment burden caused by the high saturated vapor pressure and low stability of H 2 SiF 6 . Herein, we propose an additiveassisted methanesulfonic acid (MSA) system for green and efficient electrorefining of crude Pb based on the low volatility and high stability of MSA. Combinations of MSA with additives are evaluated and screened using photographic images, SEM observations, XRD, white light interference, etc. The electrochemical analysis of cyclic voltammetry and chronoamperometry elucidates the Pb deposition behavior in the Lugalvan BNO12-assisted MSA system, in which a three-dimensional nucleation model is applicable. Using MSA as the solvent and β-naphthol ethoxylate (Lugalvan BNO12) as the assisted additive, the bench-scale operation of crude Pb electrorefining experimentally achieves an electric energy requirement (W) of 87 kWh e /t Pb and a cathodic current efficiency (η) of 99.6%. This is very competitive with the W of 120 kWh e /t Pb and η of 95.0% for the BG-CL-assisted H 2 SiF 6 system. Also, the bench-scale operation obtains a plat and dense deposit sample with a Pb purity of >99.99%. The distribution behavior of elements shows that most of the Pb element is recovered in the form of the cathodic Pb, elements Sn, Zn, and Fe mainly accumulate in the electrolyte, and elements As, Sb, Bi, Ag, and Cu remain in the anode slime. This work opens new directions for more technically and economically feasible Pb electrorefining.

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“…, α 0 and ß 0 based on the Tafel law (details in Supporting Information, Section S1 and Figure S4). The modeled energy consumption (W m ) was estimated through the following equation: [16,27] W m ½kJ e mol HfðOEtÞ 4…”

Section: Microkinetic Modelingmentioning

confidence: 99%

“…[10] These are because the electrochemical process acts directly on the target substance, but not the medium. [16] For example, aluminium, despite being the largest distributed metal in the earth's crust, was equal in value to silver before the wide deployment of the electrochemical Hall-Herold method. [17] Furthermore, no consumable items like expensive ion exchange membranes is needed for dividing the anode and cathode because of the synergistically combined redox transformations on the anode and cathode of EHS.…”

Section: Introductionmentioning

confidence: 99%

Electrodissolution‐Coupled Hafnium Alkoxide Synthesis with High Environmental and Economic Benefits

Yang

et al. 2022

ChemSusChem

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The conventional thermal method of preparing hafnium alkoxides [Hf(OR) 4 , R = alkyl] -excellent precursors for gatedielectric HfO 2 on semiconductors -is severely hindered by its unsatisfactory environmental and economic burdens. Herein, we propose a promising electrodissolution-coupled Hf(OR) 4 synthesis (EHS) system for green and efficient electrosynthesis of Hf(OR) 4 . The operational principle of the electrically driven system consists of two simultaneous heterogeneous reactions of Hf dissolution and alcohol dehydrogenation, plus a spontaneous solution-based combination reaction. In applying ethanol as solvent and Hf metal as electrodissolution medium, we achieved waste-free production of high-purity hafnium ethoxide [Hf(OEt) 4 ] with an equivalent "a concomitant" reduction in CO 2 emission of 187.33 g CO 2 per kg Hf(OEt) 4 and a high net profit of 30 477 USD per kg Hf(OEt) 4 . This system is very competitive with the thermal process, which unavoidably releases substantial waste and CO 2 for a net profit of 27 700 USD per kg Hf(OEt) 4 . We anticipate that the environmental and economic benefits of the EHS process could pave the way for its practical application.

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Electrowinning-coupled CO2 capture with energy-efficient absorbent regeneration: Towards practical application

Cited by 39 publications

References 42 publications

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

Electrodissolution‐Coupled Hafnium Alkoxide Synthesis with High Environmental and Economic Benefits

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