Ambient and sub-ambient temperature direct air CO<sub>2</sub> capture (DAC) by novel supported <i>in situ</i> polymerized amines

Al-Absi, Akram A.; Benneker, Anne M.; Mahinpey, Nader

doi:10.1039/d3ta07909k

Cited by 7 publications

(3 citation statements)

References 99 publications

(204 reference statements)

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“…Furthermore, the use of PEI with higher molecular weights can result in diffusion limitations and less CO 2 uptakes. 58 The cation ring-opening polymerization (CROP) 17,59 of EtOX to obtain poly(2-ethyl-2-oxazoline) was conducted by mixing 10.0 g of the monomer (EtOX) with 1.0 g of the dried functionalized support and 20.0 g of benzonitrile at room temperature under nitrogen. Subsequently, the temperature was elevated to 90 °C and maintained for 48 h or until the material solidified.…”

Section: Materials Synthesismentioning

confidence: 99%

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Al-Absi,

Benneker,

Mahinpey

2024

Energy Fuels

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The emerging technology of direct air capture (DAC) holds promise for the extraction of CO 2 from the air, offering a potential avenue to reverse climate change. However, DAC is still in its early stages of development, particularly on the sorbent material side, and the long-term stability of sorbents remains inadequately understood. This study investigates the impact of thermal degradation, hydrothermal treatment, long-term cyclic operation, and extended aging over 3 years on amine-supported sorbents and its effect on the adsorption capacity at DAC conditions. Sorbents were synthesized through various methods (impregnation, chemical grafting, and in situ polymerization) into two supports: large-pore AlMCM-41 (LPAlSi) and mesoporous silica foam (MSF). LPAlSi support demonstrates superior stability compared to MSF support under thermal and hydrothermal treatments. Impregnated sorbents with physically bonded amines exhibit the lowest stability, with a significant amine loss during all treatments, confirmed through porosity analysis, thermogravimetric analysis (TGA) decomposition, scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). Additionally, they experience a notable 6% decrease in CO 2 uptake after 50 cycles. In contrast, chemically bonded amines through grafting and in situ polymerization display better stability due to stronger bonding, maintaining CO 2 uptake despite harsh treatments. In situ-polymerized sorbents into LPAlSi exhibit remarkable stability under thermal and hydrothermal treatments, experiencing drops of 17 and 27% over 3 days, respectively. Furthermore, they demonstrate outstanding stability over 50 cycles under DAC conditions, with only a 0.3% drop in CO 2 uptake. Extended aging of class III sorbent for 3 years indicates good stability in CO 2 uptake, with only an 11% drop compared to impregnated ones, which showed a larger decrease over a shorter time. The presented results suggest that in situ-polymerized amines into LPAlSi are promising materials for DAC, offering good capacity and significant long-term stability. With opportunities for further sorbent optimization, there is substantial potential to deploy DAC at a scalable level and mitigate global warming effects.

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Section: Materials Synthesismentioning

confidence: 99%

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Al-Absi,

Benneker,

Mahinpey

2024

Energy Fuels

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“…7−12 As the concentration of CO 2 increases, it traps more heat in the atmosphere, leading to rising global temperatures and a range of associated effects such as more intense and frequent extreme weather events, rising sea levels, and alterations in patterns of precipitation. 13,14 To address this issue, there are ongoing efforts to develop new technologies and approaches to capture and store carbon dioxide from the atmosphere, which could help to slow or even reverse the rise in CO 2 concentration over time. 15,16 For instance, precombustion, postcombustion, and oxy-fuel are three different technologies used in carbon capture and storage (CCS) to decrease carbon dioxide emissions from industrial processes and power plants.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The rise in atmospheric carbon dioxide levels is a significant concern, as it is one of the primary drivers of climate change. − This increment is mainly due to human actions, including deforestation, the combustion of fossil fuels, and other industrial and agricultural practices. − As the concentration of CO 2 increases, it traps more heat in the atmosphere, leading to rising global temperatures and a range of associated effects such as more intense and frequent extreme weather events, rising sea levels, and alterations in patterns of precipitation. , …”

Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Daneshmand-jahromi,

Sedghkerdar,

Karami

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) is an innovative cyclic process for fuel combustion to intrinsically separate carbon dioxide. In this process, oxygen and fuel are contacted by an intermediate oxygen carrier (OC), a metal oxide/metal that can alternately be reduced and oxidized. In this study, a yolk (Al2O3)–shell (ZrO2) was synthesized as the support of the OC and 20 wt % copper oxide was impregnated on the surface of it. The structure and cyclic reduction–oxidation (redox) performance of the CuO-impregnated yolk–shell sample were compared with those of CuO-impregnated core (Al2O3)–shell (ZrO2) and CuO-impregnated alumina oxygen carriers in the CLC process. The synthesized OCs were characterized by Brunauer–Emmett–Teller (BET) surface area, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX) dot mapping. A homogeneous coating of the zirconia on the alumina was obtained for the yolk–shell material. The pore size distribution became narrow in the presence of the zirconia coating. Furthermore, a yolk–shell architecture prevented the contact between the yolk (Al2O3) and the copper oxide materials, and CuAl2O4 spinel formation was inhibited. The obtained results showed that the oxygen transport capacities of the 20CuO/Al–C@Zr (yolk–shell support), 20CuO/Al@Zr (core–shell support), and 20CuO/Al oxygen carriers are 3.80, 3.47, and 3.4 wt %, respectively. The oxygen carrier with the yolk–shell support exhibited the highest activity, oxygen transport capacity, and coke formation resistance.

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Absorption characteristics and rheological properties of quaternized polyamine-based deep eutectic solvents for high performance CO2 capture

Ju,

Choi,

Cho

et al. 2024

Chemical Engineering Journal

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Ambient and sub-ambient temperature direct air CO₂ capture (DAC) by novel supported in situ polymerized amines

Abstract: With the dramatic increase in CO2 emissions over the last few decades and the subsequent rise in global temperatures leading to climate change, substantial efforts have been directed towards the...

Cited by 7 publications

References 99 publications

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Absorption characteristics and rheological properties of quaternized polyamine-based deep eutectic solvents for high performance CO2 capture

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Ambient and sub-ambient temperature direct air CO2 capture (DAC) by novel supported in situ polymerized amines

Abstract: With the dramatic increase in CO2 emissions over the last few decades and the subsequent rise in global temperatures leading to climate change, substantial efforts have been directed towards the...

Cited by 7 publications

References 99 publications

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Amine Sorbents for Sustainable Direct Air Capture: Long-Term Stability and Extended Aging Study

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Absorption characteristics and rheological properties of quaternized polyamine-based deep eutectic solvents for high performance CO2 capture

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Product

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Ambient and sub-ambient temperature direct air CO₂ capture (DAC) by novel supported in situ polymerized amines