Schlagwort: DACCS

Nature – Olim et al. (2025): Mitigating anthropogenic climate change with aqueous green energy

Sophia T. Olim, Anna Nickoloff, Leslie J. Moffat, Andrew J. Weaver, Michael Eby IN: Scientific Reports, 15, https://doi.org/10.1038/s41598-025-86042-7

The combination of direct air CO2 capture and storage (DACCS) and ocean thermal energy conversion (OTEC) allows for independently powered carbon capture plants to inject concentrated carbon into deep marine sediments where storage is generally safe and permanent. OTEC is a form of electricity production that exploits the temperature difference between deep and shallow ocean waters, and can power DACCS on floating platforms at a price competitive with coal-generated electricity. Here the authors highlight the scale of the challenge facing society.

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Kumar et al. (2024): The Role of Nonequilibrium Solvent Effects in Enhancing Direct CO2 Capture at the Air–Aqueous Amino Acid Interface

Nitesh Kumar, Vyacheslav S. Bryantsev, Santanu Roy IN: Journal of the American Chemical Society, https://doi.org/10.1021/jacs.4c14612

Direct air capture (DAC) technologies are limited by the poor understanding of the dynamic role of interfaces in modulating the chemisorption of CO2 from air into solutions. While the reactivity of aqueous amine-based solvents in the bulk environment is strongly inhibited by nonequilibrium solvent effects, promoting DAC at interfaces posits a possibility to reduce the coupling with the solvent and significantly accelerate DAC. Building on an experimentally proven concept to bring an anionic glycine absorbent to the interface through ion-pairing interactions with a positively charged surfactant, the authors establish the fundamental time scales for key elementary steps involved in DAC with rate theory and enhanced-sampling ab initio molecular dynamics simulations. The authors elucidate the mechanism by which water influences the free energy barriers and dynamical crossing-recrossing of those barriers, affecting the reaction rates.

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Hosseinpour et al. (2025):Techno-economic study of a direct air capture system based on the carbonation of Ca(OH)2 plates integrated into cooling towers

Mohammad Hosseinpour, Bijan Hejazi, Yolanda A. Criado IN: Journal of Cleaner Production, https://doi.org/10.1016/j.jclepro.2024.144545

One of the main challenges in DAC processes is the high energy and economic costs associated with airflow systems in large-scale air contactors. Recently, there has been a growing interest in using hydrated lime to capture low concentrations of CO2 (∼450 ppm) from the atmosphere, particularly at higher air relative humidity. Cooling towers, commonly used in various industrial units to cool process water, provide an ideal environment for hydrated lime-based DAC systems as they expose large flows of ambient air to water. This study assessed the feasibility of integrating vertically oriented parallel flat plates of Ca(OH)2 into the upper section of an industrial mechanical draft cooling tower to simultaneously perform the dual tasks of water cooling and CO2 capture from the passing air.

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Xie et al. (2024): Negative emissions technologies in energy system models and mitigation scenarios – a systematic review

Weipeng Xie, Vahid Aryanpur, Paul Deane, Hannah E. Daly IN: Applied Energy 380, 125064, https://doi.org/10.1016/j.apenergy.2024.125064

Modelled scenarios within Integrated Assessment Models and Energy Systems Models indicate that limiting global temperature rise to safe levels will require some dependence on negative emissions technologies. However, the representation of NETs varies significantly across models, leading to differences in their roles across mitigation scenarios. BECCS and DACCS are two possible solutions that are directly related to the energy system. Here, we perform a systematic review of the representation of BECCS and DACCS within ESMs and IAMs, exploring their roles in decarbonisation scenarios and identifying how NETs contribute to energy system transition pathways.

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Ozkan et al. (2024): Advancements in cost-effective direct air capture technology

Mihrimah Ozkan, Saeb Besarati, Christopher Gordon, Gaël Gobaille-Shaw, Noah McQueen IN: Chem, https://doi.org/10.1016/j.chempr.2024.09.025

In collaboration with experts from industry leaders such as Climeworks, Carbon Capture, Mission Zero, and Heirloom, the latest developments highlight DAC technology’s potential to become a viable and sustainable solution for large-scale CO₂ removal. These advancements include reductions in energy consumption to as low as 1,055 kWh per ton of CO₂ through electrochemical methods and strategic integration of renewable energy sources like geothermal power. Additionally, economies of scale achieved through bulk purchasing and streamlined manufacturing processes have lowered DAC modules’ per-unit cost.

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Mohan et al. (2024): Direct air capture integration with low-carbon heat: Process engineering and power system analysis

Aniruddh Mohan, Fangwei Cheng, Hongxi Luo, Chris Greig, Eric Larson, Jesse D. Jenkins IN: Energy Conversion and Management, 322, 119136, https://doi.org/10.1016/j.enconman.2024.119136

Here, the authors undertake a unique interdisciplinary study combining process engineering with a detailed macro-energy system optimization model to evaluate the system-level impacts of such plant designs in the Texas electricity system. They contrast this with using grid power to operate a heat pump to regenerate the sorbent. The analysis identifies net carbon removal costs accounting for power system impacts and resulting indirect CO2 emissions from DAC energy consumption.

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Nature – Shorey & Abdulla (2024): Liquid solvent direct air capture’s cost and carbon dioxide removal vary with ambient environmental conditions

Patrick Shorey, Ahmed Abdulla IN: Communications Earth & Environment, 5, https://doi.org/10.1038/s43247-024-01773-1

Process models of DAC systems assume that they would operate at standard ambient temperature and pressure, when capture rates vary with ambient conditions, including temperature, relative humidity, and other factors. Here, the authors build an open-source model of a liquid solvent direct air capture technology and analyze its capture performance as a function of hourly varying ambient environmental conditions across Canada.

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Cao et al. (2024): Highly efficient direct air capture using solid–liquid phase separation in aqueous diamine solution as sorbent

Furong Cao, Soichi Kikkawa, Hidetaka Yamada, Seiji Yamazo IN: Bulletin of the Chemical Society of Japan, 97, 9, https://doi.org/10.1093/bulcsj/uoae096

In this work, a series of aqueous diamine solutions was examined for 400 ppm CO2 absorption at ambient temperature. The absorbents exhibited CO2 absorption with molar ratio of 1 molCO2/molamine, and aqueous isophorone diamine (IPDA) in particular showed >99% CO2 removal even under a 500 mL min−1 flow of 400 ppm CO2–N2 with the contact rate of 13,761.5 h−1 between CO2 and IPDA aqueous solution and the CO2 absorption rate of 4.46 mmol/L min. A precipitate of carbamic acid of IPDA was formed by reaction with CO2, and the CO2 removal efficiency was enhanced by increasing the solution viscosity by the formation of this precipitate.

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Rezo et al. (2024): A method for siting adsorption-based direct air carbon capture and storage plants for maximum CO2 removal

D. Rezo, P. Postweiler, M. Engelpracht, L. Meuleneers, N. von der Aßen IN: Carbon Neutrality, https://doi.org/10.1007/s43979-024-00100-z

To assess DACCS performance holistically, a detailed global analysis is needed that accounts for the interplay of regional ambient conditions, energy supply, and CO2 storage potential. Hence, the authors present a novel method for the optimal siting of DACCS plants derived from optimising a dynamic process model that uses global hourly weather data and regionalised data on electricity supply and CO2 storage potential. The carbon removal rate (CRR) measures the climate benefit and describes the speed at which a DACCS plant generates net negative emissions.

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Fan et al. (2024): Charged sorbents for efficient CO2 removal

Xinyi Fan, Xin Sun, Alex W. Robertson, Zhenyu Sun IN: The Innovation Materialshttps://doi.org/10.59717/j.xinn-mater.2024.100088

Of further merit is the favourable electrical and thermal conductivities of the adsorbent, which are sufficiently high such that Joule heating desorption can be carried out directly, offering the opportunity to employ renewable energy sources to drive the desorption. This significantly improves the techno-economic argument and credibility for this as a viable DAC technology. The relatively low costs of the constituent material and electrolyte also point to the potential readiness for commercialization. Beyond its use in DAC, the authors’ demonstration of readily tuneable charged-sorbent materials, where the electrolyte and electrode can be rationally selected and designed, should lead to a family of new materials with applications in various energy-efficient gas separation technologies and energy conversion processes.

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