Direct air capture (DAC) of CO<sub>2</sub> using polyethylenimine (PEI) “snow”: a scalable strategy

Xu, Xingguang; Myers, Matthew; Versteeg, Friso G.; Heath, Charles; Wood, Colin D.

doi:10.1039/d0cc02572k

Cited by 34 publications

(29 citation statements)

References 25 publications

(23 reference statements)

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“…The samples were presaturated with CO 2 to assess the desorption conditions. The TGA curves of the DEA/water and DEA/EG mixture are shown in Figure a,b, respectively, where the combined H 2 O/CO 2 evaporation/desorption from 50 to 100 °C is clearly visible for the DEA/water mixture, which agrees with the previous observations. − DEA is observed to being lost at >150 °C (the boiling point of DEA is 269 °C). By comparison, the DEA/EG mixture has a distinct CO 2 desorption at 80 °C, while the bulk EG solvent does not start to be lost until >120 °C.…”

Section: Resultssupporting

confidence: 89%

“…Thus, in water systems, a large amount of water mass can be lost in the early heating stages, and hence, a large derivative peak is observed. 32 H 2 O and CO 2 evaporate/desorb at the same time, while bulk EG does not begin to evaporate until approximately 120 °C, and this continues up to the boiling point of EG (197 °C). The EG evaporation curve is also more well-defined compared to that of the DEA/EG system as PE does not start to evaporate until reaching 150 °C, similar to the DEA system.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…We have shown previously that the loss of water also drastically reduces the CO 2 uptake capacity. 32 With a properly selected nonaqueous solvent such as EG, the desorption of CO 2 occurs at a lower temperature than the bulk evaporation of the solvent, which helps alleviate these concerns. Using pure DEA also eliminates this problem as the desorption of CO 2 occurs at a sufficiently low temperature that evaporation of DEA can be minimized.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

White

Adam

Sabri

et al. 2021

Ind. Eng. Chem. Res.

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Amine-infused hydrogels provide a facile platform for developing solid sorbents with improved CO2 capture performance relative to that of their liquid counterparts. In this study, we develop hydrogel materials that can be easily manufactured at a large scale and have high flow gas permeability characteristics, fast uptake kinetics, and minimal performance degradation after recycling, properties which are particularly important for applications in direct air capture (DAC). To overcome water loss issues associated with hydrogel materials for DAC, we have introduced high-boiling-point/nonaqueous solvent systems, which significantly lowered the solvent loss, leading to dramatically improved recyclability. Among the materials developed, cross-linked poly(N-2-hydroxyethylacrylamide) (PHEAA) infused with diethanolamine (DEA) exhibited 7.82 and 2.90 wt % CO2 uptake with pure CO2 and DAC, respectively. Interestingly, by changing the hydrogel platform between either a cross-linked superabsorbent [i.e., poly(acrylamide/sodium acrylate)], PHEAA, or poly(acrylamide) (PolyAA) and impregnating with different amines/solvents, the uptake kinetics could be controlled and significantly improved. In fact, the PolyAA system impregnated with DEA in ethylene glycol showed 90% of the total capacity (6.37%) in 350 s (vs 4300 s in the case of the PHEAA/DEA system) as well as an enhanced amine efficiency (0.76 vs 0.28 mol CO2 per amine). Thus, this study demonstrates the use of different nonaqueous solvents on readily synthesized hydrogel platforms to improve the DAC uptake efficiency and kinetics. The fast kinetics enable shorter adsorption/desorption cycles, which will be advantageous in improving the CO2 uptake selectivity and reducing the sorption of water in larger-scale implementations of this approach, in both urban and industrial applications.

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Section: Resultssupporting

confidence: 89%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

White

Adam

Sabri

et al. 2021

Ind. Eng. Chem. Res.

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“…118 In 2020, the researchers further developed this work by employing the triepoxy-triglycidyl trimethylolpropane ether as the crosslinker which could yield a powdery material. 119 3.3 Factors affecting CO 2 adsorption 3.3.1 Temperature and humidity. The performance of a CO 2 adsorbent is significantly affected by the temperature and humidity of its external working environment.…”

Section: Materials Advancesmentioning

confidence: 99%

The application of amine-based materials for carbon capture and utilisation: an overarching view

et al. 2021

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“…The increase in atmospheric CO 2 concentration has alarming implications for global climate change. Intense efforts have been dedicated by researchers to develop effective technologies for carbon capture and sequestration (CCS), with one approach recently recognized as potentially critical to rapid climate stabilization, the direct removal of CO 2 from the atmosphere, or direct air capture. − Direct air capture of CO 2 (DAC) from the atmosphere has been recently developed as a potential negative emissions technology (NET) due to its technological, scalability, and environmental advantages. − …”

Section: Inroductionmentioning

confidence: 99%

Alkyl-Aryl Amine-Rich Molecules for CO₂ Removal via Direct Air Capture

Kumar

Rosu

Sujan

et al. 2020

ACS Sustainable Chem. Eng.

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Alkyl-aryl amine-rich small molecules (Ph-X-YY) are prepared by one-step nucleophilic substitution from tri- (X = 3) and hexa-bromine-substituted (X = 6) aromatic cores with two different aliphatic diamines, ethylenediamine (YY = ED) and propylenediamine (YY = PD). The resulting Ph-X-YY molecules are impregnated into mesoporous silica support materials (SBA-15) at predetermined organic loadings (20%–60%). TGA and DSC analyses suggest that these sorbent materials have good thermal stability. An increase in the amine loading led to an increase in CO2 adsorption capacity measured under simulated dry direct air capture (DAC) conditions. The Ph-3-YY based sorbents show superior CO2 adsorption capacities compared to the Ph-6-YY-based sorbent homologues, likely due to the bulkier molecular structure of the Ph-6-YY family. The highest CO2 capacity was demonstrated with the Ph-3-ED-based sorbent, 1.9 mmol/gSiO2, and an amine efficiency of 0.13 mmol CO2/mmol N at 35 °C under dry conditions. Temperature-swing adsorption/desorption cycles showed that the Ph-X-YY/SBA-15 had relatively stable performance that is comparable to that of the benchmark poly(ethyleneimine) (PEI) and linear poly(propyleneimine) (PPI) supported SBA-15 sorbents. The 60% Ph-3-ED/SBA-15 sample showed a 2-fold increase in the CO2 adsorption capacity under humid conditions (2.9 mmol/gSiO2 @ 30%, RH) and a 70% increase in amine efficieny (0.17 mmol CO2/mmol N). Thus, these aromatic-based polyamine molecules offer good potential for incorporation into practical CO2 sorbents targeting DAC technologies, and their structures expand the library of the amine-rich molecules that have been explored for DAC.

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Direct air capture (DAC) of CO₂ using polyethylenimine (PEI) “snow”: a scalable strategy

Abstract: We report the rapid and scalable preparation of PEI snow that can remove CO2 from air under industrial conditions.

Cited by 34 publications

References 25 publications

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

The application of amine-based materials for carbon capture and utilisation: an overarching view

Alkyl-Aryl Amine-Rich Molecules for CO₂ Removal via Direct Air Capture

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Direct air capture (DAC) of CO2 using polyethylenimine (PEI) “snow”: a scalable strategy

Abstract: We report the rapid and scalable preparation of PEI snow that can remove CO2 from air under industrial conditions.

Cited by 34 publications

References 25 publications

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO2 Capture Performance

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO2 Capture Performance

The application of amine-based materials for carbon capture and utilisation: an overarching view

Alkyl-Aryl Amine-Rich Molecules for CO2 Removal via Direct Air Capture

Contact Info

Product

Resources

About

Direct air capture (DAC) of CO₂ using polyethylenimine (PEI) “snow”: a scalable strategy

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

Amine-Infused Hydrogels with Nonaqueous Solvents: Facile Platforms to Control CO₂ Capture Performance

Alkyl-Aryl Amine-Rich Molecules for CO₂ Removal via Direct Air Capture