Carbon Dioxide

Topham, Susan A.; Bazzanella, Alexis; Schiebahn, Sebastian; Luhr, Sebastian; Li, Zhao; Otto, Alexander; Stolten, Detlef

doi:10.1002/14356007.a05_165.pub2

Cited by 14 publications

(11 citation statements)

References 101 publications

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“…In order to face the rising concentration of anthropogenic carbon dioxide (CO 2 ) in the atmosphere, new and feasible strategies for carbon capture and utilization are required. − Today the initial step of CO 2 capture is mainly realized via a thermal sorption/desorption process, − ,, and electrochemical CO 2 capture and release using organic carbonyl compounds is a new and promising alternative to these processes. Among those, quinones turned out to be the most promising material class due to their reversible reduction features involving two electrons.…”

Section: Introductionmentioning

confidence: 99%

Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

et al. 2022

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Electrochemical capture of carbon dioxide (CO 2 ) using organic quinones is a promising and intensively studied alternative to the industrially established scrubbing processes. While recent studies focused only on the influence of substituents having a simple mesomeric or nucleophilicity effect, we have systematically selected six anthraquinone (AQ) derivatives (X-AQ) with amino and hydroxy substituents in order to thoroughly study the influence thereof on the properties of electrochemical CO 2 capture. Experimental data from cyclic voltammetry (CV) and UV–Vis spectroelectrochemistry of solutions in acetonitrile were analyzed and compared with innovative density functional tight binding computational results. Our experimental and theoretical results provide a coherent explanation of the influence of CO 2 on the CV data in terms of weak and strong binding nomenclature of the dianions. In addition to this terminology, we have identified the dihydroxy substituted AQ as a new class of molecules forming rather unstable [X-AQ-(CO 2 ) n ] 2– adducts. In contrast to the commonly used dianion consideration, the results presented herein reveal opposite trends in stability for the X-AQ-CO 2 •– radical species for the first time. To the best of our knowledge, this study presents theoretically calculated UV–Vis spectra for the various CO 2 -AQ reduction products for the first time, enabling a detailed decomposition of the spectroelectrochemical data. Thus, this work provides an extension of the existing classification with proof of the existence of X-AQ-CO 2 species, which will be the basis of future studies focusing on improved materials for electrochemical CO 2 capture.

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Section: Introductionmentioning

confidence: 99%

Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

et al. 2022

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“…[1] Thus, many research projects aim to limit these emissions by different processes. [1] Thus, many research projects aim to limit these emissions by different processes.…”

Section: Introductionmentioning

confidence: 99%

“…Climate change has been correlated with a strong increase in anthropogenic CO 2 emissions over the last century . Thus, many research projects aim to limit these emissions by different processes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced CO₂ Absorption in Organic Solutions of Biobased Ionic Liquids

Davarpanah

Hernández

Latini

et al. 2019

Advanced Sustainable Systems

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and in the field of biomass conversion. Future applications for CO 2 separation technologies are presumed to be within the so-called carbon capture and utilization (CCU) route. [6][7][8] The idea is to exploit CO 2 as a raw material for further chemical or industrial use and, thus, to valorize it by recycling. In the long term, CCU aims the development of a circular economy concept with neutral carbon emissions.Absorption is one of the main techniques used for CO 2 capture, [9] it relies on either chemical or physical interactions between the solvent and the solute CO 2 . In physical absorption, intermolecular forces, such as Coulomb, Van-der-Waals or other dispersion forces dominate the solute-solvent interactions. In chemical absorption, CO 2 chemically reacts with the solvent molecules and forms covalent bonds. Due to their stoichiometric reaction with CO 2 , their CO 2 absorption capacity is very high even at low CO 2 partial pressures. Chemical absorption is particularly appropriate if CO 2 is to be recovered from flue gas streams with relatively low concentrations. The major advantages of chemical absorption processes are the high selectivity for CO 2 and the high achievable gas product purity.The most commonly used chemical absorbents are amines (15-60 wt%) in aqueous solutions (i.e., typical loading of 0.5 mol CO 2 /mol amine for monoethanolamine, MEA). Amines have some drawbacks like a high corrosion rate at high concentrations, the outlet purified gas contains a high-water amount, the energy demand for their regeneration is high and they suffer from high evaporation losses. [10] Indeed, the reverse chemical reaction requires considerable activation energy that is commonly supplied by increasing the temperature of the absorbent. When a volatile absorbent is used, it must be either condensed from the purified gas stream or replenished with the consequent rise of operative costs. Therefore, improvement of the absorption medium, e.g., decreasing the volatility without losing the high loading of the absorbent phase is the primary research interest in physical and chemical absorption technologies.Since the 1990s, low-melting salts have gained increasing interest for application as alternative absorbents in a wide field of chemical processes. For salts with melting points below 100 °C, the term ionic liquid (IL) has been coined. As ILs are built up from an organic cation and an inorganic or organic anion, there is a vast variety of possible structures. Over the last years, a plethora of ILs and their mixtures have been Solutions of biobased ionic liquids (ILs) for recovering CO 2 from industrial flue gas are investigated. Four CO 2 task-specific choline-based amino acids ([Cho][AA]): Alanine, Glycine, and, for the first time, Proline and Serine are tested. The drawbacks related to the high viscosity of these ILs are limited by applying dimethyl sulfoxide (DMSO) as a solvent, which is chosen because it is a polar aprotic liquid with a low toxicity, low vapor pressure, and relatively low price. The choline-based...

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“…At present, captured CO 2 often needs resource-intensive purification prior to use as a monomer. As such, most polymerized CO 2 is sourced as the byproduct of ammonia and hydrogen production where it is generated in high purity . While kinetically accessible, the thermodynamic stability of CO 2 requires it to react with comonomers such as epoxides or alkenes to drive polymerization .…”

Section: Sustainable Polymersmentioning

confidence: 99%

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

et al. 2020

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Although Staudinger realized makromoleküles had enormous potential, he likely did not anticipate the consequences of their universal adoption. With 6.3 billion metric tons of plastic waste now contaminating our land, water, and air, we are facing an environmental and public health crisis. Synthetic polymer chemists can help create a more sustainable future, but are we on the right path to do so? Herein, a comprehensive literature survey reveals that there has been an increased focus on “sustainable polymers” in recent years, but most papers focus on biomass-derived feedstocks. In contrast, there is less focus on polymer end-of-life fates. Moving forward, we suggest an increased emphasis on chemical recycling, which sees value in plastic waste and promotes a closed-loop plastic economy. To help keep us on the path to sustainability, the synthetic polymer community should routinely seek the systems perspective offered by life cycle assessment.

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Carbon Dioxide

Cited by 14 publications

References 101 publications

Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Enhanced CO₂ Absorption in Organic Solutions of Biobased Ionic Liquids

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

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Carbon Dioxide

Cited by 14 publications

References 101 publications

Direct Electrochemical CO2 Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Direct Electrochemical CO2 Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Enhanced CO2 Absorption in Organic Solutions of Biobased Ionic Liquids

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

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Product

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Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Direct Electrochemical CO₂ Capture Using Substituted Anthraquinones in Homogeneous Solutions: A Joint Experimental and Theoretical Study

Enhanced CO₂ Absorption in Organic Solutions of Biobased Ionic Liquids