Operating temperatures affect direct air capture of CO2 in polyamine-loaded mesoporous silica

Miao, Yihe; He, Zhijun; Zhu, Xuancan; Izikowitz, David; Li, Jia

doi:10.1016/j.cej.2021.131875

Cited by 80 publications

(46 citation statements)

References 41 publications

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“…The work of Sabatino et al [58] reports a comparison between some MOFs and aminefunctionalized sorbents to evaluate costs and energy consumptions; however, their research is not based on design calculation but multi-objective optimization without any correlation between design parameters. Other research on adsorption technology are concerned with the sensitivity analysis of operating parameters [59,60], regeneration methodology [61], new adsorbent bed [62], and thermodynamics [63].…”

Section: Future Cost (Usd/tonneco 2 )mentioning

confidence: 99%

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

2022

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Direct air capture can be based on an adsorption system, and the used sorbent (chemisorbents or physisorbents) influences process. In this work, two amine-functionalized sorbents, as chemisorbents, and three different metal organic frameworks, as physisorbents, are considered and compared in terms of some key performance indicators. This was carried out by developing a mathematical model describing the adsorption and desorption stages. An independent analysis was carried out in order to verify data reported in the literature. Results show that the equilibrium loading is a critical parameter for adsorption capacity, energy consumption, and cost. The considered metal organic frameworks are characterized by a lower equilibrium loading (10−4 mol/kg) compared to chemisorbents (10−1 mol/kg). For this reason, physisorbents have higher overall energy consumptions and costs, while capturing a lower amount of carbon dioxide. A reasonable agreement is found on the basis of the operating conditions of the Climeworks company, modelling the use of the same amine cellulose-based sorbent. The same order of magnitude is found for total costs (751 USD/tonneCO2 for our analysis, compared to the value of 600 USD/tonneCO2 proposed by this company).

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Section: Future Cost (Usd/tonneco 2 )mentioning

confidence: 99%

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

2022

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“…Although substantially less mature, low-temperature DACS processes have attracted considerable attention over the past two decades. [28,29] These processes typically involve contacting ambient air with porous adsorbents (e.g., mesoporous silicas, [30,31] celluloses, [32][33][34] and metal-organic frameworks (MOFs) [35,36] ). The adsorbent is typically functionalized with amines to impart selectivity toward CO 2 in the presence of the more abundant components in air, leveraging favorable acid-base chemistry between CO 2 and nucleophilic amines.…”

Section: Regional Water Security Is Central To Climate Change Mitigationmentioning

confidence: 99%

Prospects for Simultaneously Capturing Carbon Dioxide and Harvesting Water from Air

Dods

Weston

2022

Advanced Materials

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Mitigation of anthropogenic climate change is expected to require large‐scale deployment of carbon dioxide removal strategies. Prominent among these strategies is direct air capture with sequestration (DACS), which encompasses the removal and long‐term storage of atmospheric CO2 by purely engineered means. Because it does not require arable land or copious amounts of freshwater, DACS is already attractive in the context of sustainable development, but opportunities to improve its sustainability still exist. Leveraging differences in the chemistry of CO2 and water adsorption within porous solids, here, the prospect of simultaneously removing water alongside CO2 in direct air capture operations is investigated. In many cases, the co‐adsorbed water can be desorbed separately from chemisorbed CO2 molecules, enabling efficient harvesting of water from air. Depending upon the material employed and process conditions, the desorbed water can be of sufficiently high purity for industrial, agricultural, or potable use and can thus improve regional water security. Additionally, the recovered water can offset a portion of the costs associated with DACS. In this Perspective, molecular‐ and process‐level insights are combined to identify routes toward realizing this nascent yet enticing concept.

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“… 19 − 21 Branched poly(ethylenimine) (PEI) and tetraethylenepentamine (TEPA) were identified in previous studies as two promising amine materials that showed good CO 2 adsorption performance when supported on solid substrates and hence were chosen for this work. 3 , 28 , 34 − 38 As for the choice of the support, MIL-101(Cr) is moisture-stable (it is stable in boiling water), suggesting it will not catastrophically degrade during sorbent regeneration by steam; it is stable across a range of pH conditions, making it resistant to the basicity of amines and the acidity of CO 2 ; and it has a high surface area and high density of open metal sites, enabling the loading of a large quantity of amines into the pores to attain high CO 2 capacities even at concentrations as low as 400 ppm. 39 , 40 The feasibility of amine-loaded MIL-101(Cr) for DAC at ambient temperatures and dry conditions has been validated by previous studies.…”

Section: Introductionmentioning

confidence: 99%

Sub-Ambient Temperature Direct Air Capture of CO₂ using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO₂ Recovery

Rim

Kong

Song

et al. 2022

JACS Au

107

104

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Due to the dramatically increased atmospheric CO 2 concentration and consequential climate change, significant effort has been made to develop sorbents to directly capture CO 2 from ambient air (direct air capture, DAC) to achieve negative CO 2 emissions in the immediate future. However, most developed sorbents have been studied under a limited array of temperature (>20 °C) and humidity conditions. In particular, the dearth of experimental data on DAC at sub-ambient conditions (e.g., −30 to 20 °C) and under humid conditions will severely hinder the large-scale implementation of DAC because the world has annual average temperatures ranging from −30 to 30 °C depending on the location and essentially no place has a zero absolute humidity. To this end, we suggest that understanding CO 2 adsorption from ambient air at sub-ambient temperatures, below 20 °C, is crucial because colder temperatures represent important practical operating conditions and because such temperatures may provide conditions where new sorbent materials or enhanced process performance might be achieved. Here we demonstrate that MIL-101(Cr) materials impregnated with amines (TEPA, tetraethylenepentamine, or PEI, poly(ethylenimine)) offer promising adsorption and desorption behavior under DAC conditions in both the presence and absence of humidity under a wide range of temperatures (−20 to 25 °C). Depending on the amine loading and adsorption temperature, the sorbents show different CO 2 capture behavior. With 30 and 50 wt % amine loadings, the sorbents show weak and strong chemisorption-dominant CO 2 capture behavior, respectively. Interestingly, at −20 °C, the CO 2 adsorption capacity of 30 wt % TEPA-impregnated MIL-101(Cr) significantly increased up to 1.12 mmol/g from 0.39 mmol/g at ambient conditions (25 °C) due to the enhanced weak chemisorption. More importantly, the sorbents also show promising working capacities (0.72 mmol/g) over 15 small temperature swing cycles with an ultralow regeneration temperature (−20 °C sorption to 25 °C desorption). The sub-ambient DAC performance of the sorbents is further enhanced under humid conditions, showing promising and stable CO 2 working capacities over multiple humid small temperature swing cycles. These results demonstrate that appropriately designed DAC sorbents can operate in a weak chemisorption modality at low temperatures even in the presence of humidity. Significant energy savings may be realized via the utilization of small temperature swings enabled by this weak chemisorption behavior. This work suggests that significant work on DAC materials that operate at low, sub-ambient temperatures is warranted for possible deployment in temperate and polar climates.

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Operating temperatures affect direct air capture of CO2 in polyamine-loaded mesoporous silica

Cited by 80 publications

References 41 publications

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

Prospects for Simultaneously Capturing Carbon Dioxide and Harvesting Water from Air

Sub-Ambient Temperature Direct Air Capture of CO₂ using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO₂ Recovery

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Operating temperatures affect direct air capture of CO2 in polyamine-loaded mesoporous silica

Cited by 80 publications

References 41 publications

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

A Comparative Study of Different Sorbents in the Context of Direct Air Capture (DAC): Evaluation of Key Performance Indicators and Comparisons

Prospects for Simultaneously Capturing Carbon Dioxide and Harvesting Water from Air

Sub-Ambient Temperature Direct Air Capture of CO2 using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO2 Recovery

Contact Info

Product

Resources

About

Sub-Ambient Temperature Direct Air Capture of CO₂ using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO₂ Recovery