Systems Design and Economic Analysis of Direct Air Capture of CO 2 through Temperature Vacuum Swing Adsorption Using MIL-101(Cr)-PEI-800 and mmen-Mg 2 (dobpdc) MOF Adsorbents
Abstract
Direct air capture (DAC) removes CO 2 from the atmosphere and can therefore address sizable nonpoint sources emissions of CO 2 such as those from transportation. We propose a five-step temperature vacuum swing adsorption process for direct air capture using solid adsorbents coated as films on monolithic contactors using steam as the stripping agent during desorption. We perform a modeling study and economic assessment for DAC using two metal organic frameworks, MIL-101(Cr)-PEI-800 and mmen-Mg 2 (dobpdc), for which we have experimentally demonstrated film growth on monolith structures. The results indicate minimum energy requirements, and cost estimates are 0.145 MJ/mol-CO 2 and $75–140/t-CO 2 for MIL-101(Cr)-PEI-800, and 0.113 MJ/mol-CO 2 and $60–190/t-CO 2 for mmen-Mg 2 (dobpdc), respectively. The overall DAC cost is sensitive to adsorbent purchase cost and lifetime as well as cycle parameters such as adsorption and desorption times. We conclude that mmen-Mg 2 (dobpdc) has better performance compared to MIL-101(Cr)-PEI-800 in terms of energy requirements because of its higher capacity and nonlinear isotherm.
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Among the two adsorbents studied in [8], MIL-101(Cr)-PEI-800 has a lower uncertainty around the adsorbent capital cost, and it is therefore the adsorbent selected in this work.
“Out of the two adsorbents studied in [8], the MIL-101(Cr)-PEI-800 has a lower uncertainty around the adsorbent capital cost and is therefore the one selected in this work.”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
The vacuum pump operating cost is very low compared to the entire system, so variations in it are negligible.
“This cost is very low compared to the entire system [8], so we consider variations negligible and take the value as in [8] scaled by the volume fraction only:”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
The cost of the adsorbent material contains significant uncertainties, so a range of possible values for Cads is taken.
“The cost of the adsorbent material contains significant uncertainties, so, as in [8], we take a range of possible values for the quantity C ads .”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
For the monolith benchmark in [8], the first costing component C1,s is $25/t-CO2.
“For the monolith in [8], this cost is $25/t-CO 2 .”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
The model in [8] is reasonable for the simple monolithic arrangement, and its results are taken as the benchmark.
“We consider the model in [8] to be reasonable for the simple monolithic arrangement and take their results as the benchmark.”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
The optimized design allows a cost reduction from the $75-140/t-CO2 reported in [8] to $49-116/t-CO2.
“This allows for a cost reduction from the $75-140/t-CO 2 reported in [8] to a range of $49-116/t-CO 2 .”
From Topology optimisation of adsorption beds for cost-effective direct air capture (2026) · cites this paper as [8]
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Topology optimisation of adsorption beds for cost-effective direct air capture
Mallon, C., Thornton, A., Hill, M., Badia, S., & Grutering, N. (2026) · arXiv · doi:10.48550/arxiv.2609.14214
“To simplify the techno-economic evaluation process and allow for a meaningful comparison to the benchmark presented in [8], we consider, except for the geometry, exactly the same parameters for the DAC module as in [8] using the MIL-101(Cr)- PEI-800 adsorbent.”
Influential
- Authors
- Sinha, A., Darunte, L. A., Jones, C. W., Realff, M. J., & Kawajiri, Y.
- Affiliations
- Georgia Institute of Technology (US)
- Corresponding author
- Kawajiri, Yoshiaki
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-01-09
- Volume
- 56
- Issue
- 3
- Pages
- 750-764
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W2567495563
- Cited by
- 282
- References
- 7
- Citations by year
- 2026: 32 · 2025: 52 · 2024: 43 · 2023: 51 · 2022: 40 · 2021: 17 · 2020: 14 · 2019: 16 · 2018: 14 · 2017: 3
- FWCI
- 9.78
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Funders
- Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET-1336386)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
- Physical Sciences › Engineering › Mechanical Engineering › Adsorption and Cooling Systems
- Keywords
- direct air capture, carbon dioxide removal, temperature vacuum swing adsorption, metal-organic frameworks, energy requirements, cost analysis, nonlinear adsorption isotherms, CO2 capture capacity
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