Feasibility of air capture

Ranjan, Manya; Herzog, Howard J.

doi:10.1016/j.egypro.2011.02.193

Cited by 81 publications

(52 citation statements)

References 6 publications

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“…Although separating and concentrating a gas from an ultradilute source such as the air is more difficult than from a moderately dilute source such as flue gas (132), air capture has unique aspects that have the potential to make it more technically and economically tractable than one might initially suppose. First, air capture has the advantage of more flexible siting constraints (13,14,16).…”

Section: Direct Capture Of Co 2 From Ambient Air: Air Capturementioning

confidence: 99%

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Jones

2011

Annu. Rev. Chem. Biomol. Eng.

237

185

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The growing atmospheric CO(2) concentration and its impact on climate have motivated widespread research and development aimed at slowing or stemming anthropogenic carbon emissions. Technologies for carbon capture and sequestration (CCS) employing mass separating agents that extract and purify CO(2) from flue gas emanating from large point sources such as fossil fuel-fired electricity-generating power plants are under development. Recent advances in solvents, adsorbents, and membranes for postcombust- ion CO(2) capture are described here. Specifically, room-temperature ionic liquids, supported amine materials, mixed matrix and facilitated transport membranes, and metal-organic framework materials are highlighted. In addition, the concept of extracting CO(2) directly from ambient air (air capture) as a means of reducing the global atmospheric CO(2) concentration is reviewed. For both conventional CCS from large point sources and air capture, critical research needs are identified and discussed.

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Section: Direct Capture Of Co 2 From Ambient Air: Air Capturementioning

confidence: 99%

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Jones

2011

Annu. Rev. Chem. Biomol. Eng.

237

185

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“…The net result is that solar energy is used to capture CO 2 from the air for storage in geologic reservoirs with production of CO 2 -free electricity. Estimates for the total cost of capturing CO 2 from this process are in the range of $150-$400∕ tCO 2 (27).…”

Section: Part 4: Work Required To Remove Trace Gases From Mixed Gasmentioning

confidence: 99%

“…As a result, if one were to use the same solvents or sorbents in air capture as in flue gas, the sorption rates would be much lower, requiring much larger contact surface areas. Therefore, it is likely that the air capture system may require more selective binding, which can take the form of greater accessible surface area, faster kinetics, minimum diffusion constraints to the active site of adsorption or reaction, and/or enhanced binding to a given surface site or chemical solvent; otherwise, both the rich and lean solvent loadings will be lower, requiring significantly more energy to be expended in order to regenerate the solvent to the lower lean loadings (27), further driving up the potential costs of direct air capture. Stronger binding, however, may not be the best route because it will come at the expense of increased solvent regeneration cost and power.…”

Section: Part 4: Work Required To Remove Trace Gases From Mixed Gasmentioning

confidence: 99%

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Economic and energetic analysis of capturing CO ₂ from ambient air

Ac²,

Ranjan³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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431

360

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Capturing carbon dioxide from the atmosphere ("air capture") in an industrial process has been proposed as an option for stabilizing global CO 2 concentrations. Published analyses suggest these air capture systems may cost a few hundred dollars per tonne of CO 2 , making it cost competitive with mainstream CO 2 mitigation options like renewable energy, nuclear power, and carbon dioxide capture and storage from large CO 2 emitting point sources. We investigate the thermodynamic efficiencies of commercial separation systems as well as trace gas removal systems to better understand and constrain the energy requirements and costs of these air capture systems. Our empirical analyses of operating commercial processes suggest that the energetic and financial costs of capturing CO 2 from the air are likely to have been underestimated. Specifically, our analysis of existing gas separation systems suggests that, unless air capture significantly outperforms these systems, it is likely to require more than 400 kJ of work per mole of CO 2 , requiring it to be powered by CO 2 -neutral power sources in order to be CO 2 negative. We estimate that total system costs of an air capture system will be on the order of $1,000 per tonne of CO 2 , based on experience with as-built large-scale trace gas removal systems.direct air capture | gas separation economics | separation thermodynamics | concentration factor | Sherwood plot S everal researchers investigating chemical systems for capturing CO 2 from the air* have suggested that air capture could be a viable climate mitigation technology costing no more than a few hundred dollars per tonne of CO 2 avoided (1-3). It has been further argued (4) that air capture may be cost-competitive with more accepted climate change mitigation options like renewable power, nuclear power, and CO 2 capture and storage from large stationary sources (carbon capture and storage, CCS). Indeed, during visits to the Massachusetts Institute of Technology in the spring of 2009, the US President's Science Advisor, John Holdren, and Secretary of Energy, Steven Chu, each mentioned capturing carbon dioxide (CO 2 ) directly from the air as an option that may be needed for stabilizing global CO 2 concentrations and, thereby, global temperatures. To examine these claims, we have undertaken a series of analyses of the costs and energy requirements of air capture.Instead of focusing on any particular proposed air capture system, we analyze the capture of CO 2 from air, where it has a concentration of approximately 0.04%, in the context of analogous industrial separation systems. Although the minimum thermodynamic work to separate CO 2 from air is not a prohibitive burden, separation systems themselves require significantly more energy than the thermodynamic minimum. This approach, which is independent of any particular air capture system or process, is motivated on the one hand by the utility of having a generic analysis, and on the other hand by the lack of literature regarding a detailed design of a particular captu...

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“…Some studies have concluded that direct air capture has prohibitively high mitigation cost and identified it a poor and risky policy option for mitigating climate change (e.g. [12]). In a recent technical assessment carried out by the American Physical Society (APS), it is stated that based on an analyzed "benchmark system", air capture will cost at least US$ 600 per ton CO 2 avoided and would therefore "play a very limited role in a coherent CO 2 mitigation strategy for many decades" [10].…”

Section: What Is "Co2 Air Capture"?mentioning

confidence: 99%

Mitigating climate change by CO₂air capture and geological storage: opportunities for Iran

2012

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This paper investigates the preliminary strategies and tools for the implementation of CO 2 air capture and geological storage as a potential mitigation option in the future climate policy of Iran. It is a method to capture CO 2 directly from air and store it in geological structures based on large-scale industrial processes to enable the near-permanent sequestration of carbon. The reason for selecting this approach originates from its capability to mitigate CO 2 from all economic sectors with a single technology, while the conventional capture methods are designed only for mitigation of CO 2 from point sources of the power generation and industrial sectors. In order to facilitate the workflow of air capture as efficiently as possible, this study suggests some tools and directions for the selection of potential sectors and the prospective areas for the final site selection of the air capture units.

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Feasibility of air capture

Cited by 81 publications

References 6 publications

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Economic and energetic analysis of capturing CO ₂ from ambient air

Mitigating climate change by CO₂air capture and geological storage: opportunities for Iran

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Feasibility of air capture

Cited by 81 publications

References 6 publications

CO2 Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO2 Capture from Dilute Gases as a Component of Modern Global Carbon Management

Economic and energetic analysis of capturing CO 2 from ambient air

Mitigating climate change by CO2air capture and geological storage: opportunities for Iran

Contact Info

Product

Resources

About

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Economic and energetic analysis of capturing CO ₂ from ambient air

Mitigating climate change by CO₂air capture and geological storage: opportunities for Iran