The separation of CO2 from ambient air – A techno-economic assessment

Krekel, Daniel; Peters, Ralf; Stolten, Detlef; Samsun, Remzi Can

doi:10.1016/j.apenergy.2018.02.144

Cited by 70 publications

(45 citation statements)

References 54 publications

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“…Direct air capture (DAC) refers to NETs that capture CO2 from ambient air using engineered chemical processes [2,[6][7][8][9][10]. Compared to other NETs, like afforestation/reforestation, or bioenergy with carbon capture and storage (BECCS), which are constrained by land availability and present threats to biodiversity and food security, DAC has the potential for high capacity, flexibility of placement, and the generation of high-purity CO2 streams.…”

Section: Introductionmentioning

confidence: 99%

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Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Custelcean

Williams

Garrabrant

et al. 2019

Ind. Eng. Chem. Res.

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We report a bench-scale direct air capture (DAC) process comprising CO2 absorption with aqueous amino acid salts (i.e., potassium glycinate, potassium sarcosinate), followed by room-temperature regeneration of the amino acids by reaction with solid meta-benzene-bis(iminoguanidine) (m-BBIG), resulting in crystallization of the hydrated m-BBIG carbonate salt, (m-BBIGH2)(CO3)(H2O)n (n = 3-4). The CO2 is subsequently released by mild heating (60-120 °C) of the carbonate crystals, which regenerates the m-BBIG solid quantitatively. This low-temperature crystallization-based DAC process circumvents the need to heat the aqueous amino acid sorbents, thereby minimizing their loss through thermal and oxidative degradation. The CO2 cyclic capacity for the sarcosine/m-BBIG system, measured over three consecutive absorption/regeneration cycles, is in the range of 0.12-0.20 mol/mol. The regeneration energy of m-BBIG, comprising the enthalpy of CO2 and water release, and the sensible heat, is 360 kJ/mol (8.2 GJ/ton CO2). Alternatively, the aqueous amino acids can be regenerated by boiling under reflux, with measured cyclic capacities of up to 0.64 mol/mol.

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Section: Introductionmentioning

confidence: 99%

“…Most existing DAC processes fall into one of two categories, employing either aqueous solutions of strong alkaline bases (e.g., NaOH, KOH), or solid-supported amines for CO2 capture [2,6,[8][9][10]. The aqueous alkaline DAC systems consists of two cycles [11].…”

Section: Introductionmentioning

confidence: 99%

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Custelcean

Williams

Garrabrant

et al. 2019

Ind. Eng. Chem. Res.

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“…Der Sorbent ist der wichtigste Bestandteil eines Luftgewinnungs‐Systems und kann bis zur Hälfte seines Gesamtgewichts ausmachen. Es mag schwierig sein, die Kosten eines Sorbenten früh in der Entwicklungsphase einzuschätzen, doch ist es möglich, ein zulässiges Budget aufgrund seiner Leistung festzulegen . Der Wert eines Kilogramms Sorbent entspricht dem Ertragswert an CO 2 , der während seiner Lebensdauer gewonnen wurde, multipliziert mit dem Bruchteil des Ertragswerts, der dem Sorbent zugemessen wurde.…”

Section: Kostenanalyse Der Luftgewinnungs‐sorbentenunclassified

Sorbenten zur direkten Gewinnung von CO₂ aus der Umgebungsluft

et al. 2020

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Die Dringlichkeit, den durch Treibhausgasemissionen verursachten globalen Klimawandel anzugehen, wächst von Tag zu Tag. Insbesondere der Anstieg der atmosphärischen CO2‐Werte löst Alarm aus. Technologien zum Absorbieren von CO2 aus der Umgebungsluft, oder “Direct Air Capture” (DAC), haben kürzlich gezeigt, dass sie zu “negativen Kohlenstoffemissionen” beitragen können. Die jüngsten Fortschritte in der Oberflächenchemie und der Materialsynthese haben neue Generationen von CO2‐Sorptionsmitteln ermöglicht, die möglicherweise die Zukunft von DAC und seiner großangelegten Verwendung vorantreiben können. In diesem Aufsatz werden die wichtigsten Arten von Sorptionsmitteln zur Gewinnung von CO2 aus der Umgebungsluft beschrieben und nach Sorptionsmechanismen kategorisiert: Physisorption, Chemisorption und Feuchtigkeitswechsel‐Sorption.

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“…Current climate change is correlated with anthropogenic activities and is considered one of the most significant problems of humanity in the current century, compromising natural resources and life. Among greenhouse gases, CO 2 has a relatively high global warming potential, which makes it predominantly responsible for climate change [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Metal magnesium industry waste for partial replacement of Portland cement

Martins

Barreto

Soares

et al. 2020

Rev. IBRACON Estrut. Mater.

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The high demand for concrete has triggered studies on the mitigation of Portland cement production impacts, such as greenhouse gas emissions and energy demands, in addition to enabling cost reduction. Partial replacement of cement with other materials has been employed as an alternative to minimize the damage caused by the cement industry. In this regard, it is necessary to use materials that efficiently replace cement clinker. This study uses waste generated from the production of metallic magnesium as a partial replacement for Portland cement. The substitution is aimed at reducing the amount of clinker used, as its production necessitates high energy consumption and results in emission of large quantities of CO2 into the atmosphere. The tailings were characterized via X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and granulometric analysis. For evaluating the mechanical behavior and porosity, 25% of the cement (by mass) was replaced with tailings, and the resulting composite was molded into cylindrical specimens. After curing for 28 and 91 days, all specimens underwent compression testing. The results of the physical characterization showed that more than 65% of the tailing grain was lesser than 45 μm in size, which contributes to the packaging effect. In terms of the chemical and mineralogical composition, the tailing had high levels of calcium, and the predominant phases could be identified. The compressive strength of the mortar with substitution was higher than 40 MPa. The convergence observed between the results of the different characterization techniques demonstrates the efficiency of using the waste as a supplementary cementitious material.

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The separation of CO2 from ambient air – A techno-economic assessment

Cited by 70 publications

References 54 publications

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Sorbenten zur direkten Gewinnung von CO₂ aus der Umgebungsluft

Metal magnesium industry waste for partial replacement of Portland cement

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The separation of CO2 from ambient air – A techno-economic assessment

Cited by 70 publications

References 54 publications

Direct Air Capture of CO2 with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Direct Air Capture of CO2 with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Sorbenten zur direkten Gewinnung von CO2 aus der Umgebungsluft

Metal magnesium industry waste for partial replacement of Portland cement

Contact Info

Product

Resources

About

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Direct Air Capture of CO₂ with Aqueous Amino Acids and Solid Bis-iminoguanidines (BIGs)

Sorbenten zur direkten Gewinnung von CO₂ aus der Umgebungsluft