Schlagwort: Direct Air Capture

Jun Liu, Zefan Wang, Chenyang Liang, Kehao Fang, Shaokang Li, Xinwei Guo, Tao Wang, Mengxiang Fang IN: Science of The Total Environment 948, 174887, https://doi.org/10.1016/j.scitotenv.2024.174887

As an emerging carbon-negative emission technology, carbon dioxide capture from the air is an essential safeguard for alleviating global warming. Sludge-activated carbon with excellent mesoporous structure is a potential material for CO₂ capture. In this paper, the amino modified sewage sludge materials were used to prepare the porous CO₂ adsorbent from air.

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Hussain M. Almajed, Recep Kas, Paige Brimley, Allison M. Crow, Ana Somoza-Tornos, Bri-Mathias Hodge, Thomas E. Burdyny, Wilson A. Smith IN: ACS Energy Letters 9 (5), 2472-2483, https://doi.org/10.1021/acsenergylett.4c00807

CO₂ from carbonate-based capture solutions requires a substantial energy input. Replacing this step with (bi)carbonate electrolysis has been commonly proposed as an efficient alternative that coproduces CO/syngas. Here, the authors assess the feasibility of directly integrating air contactors with (bi)carbonate electrolyzers by leveraging process, multiphysics, microkinetic, and technoeconomic models. 

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Anatoly Rinberg, Michael J. Aziz IN: ACS ES&T Engineering, https://doi.org/10.1021/acsestengg.4c00150

Direct air capture of carbon dioxide is one approach among many proposed that is capable of offsetting hard-to-avoid emissions. In previous work, we developed the alkalinity concentration swing (ACS) method, which is driven through concentrating an alkaline solution that has been loaded with atmospheric CO₂ by desalination technologies, such as reverse osmosis or capacitive deionization. Though the ACS is promising in terms of energy usage and implementation, its absorption rate and water requirements are infeasible for a large-scale DAC process. Here, we propose an improvement on the ACS, the bicarbonate-enriched alkalinity concentration swing (BE-ACS), which selects bicarbonate ions from a stream of aqueous alkaline solution that has absorbed atmospheric CO₂. 

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Anne B. Ottenbros, Rosalie van Zelm, Jasper Simons, Mitchell K. van der Hulst, Kiane de Kleijne, Hans de Neve, Mark A. J. Huijbregts IN: Scientific Reports 14, 16549, https://doi.org/10.1038/s41598-024-66990-2

This study investigates the environmental impact of a new fast-swing solid sorbent DAC system, including CO₂ transport and storage, over its life cycle, using prospective life cycle assessment.

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Gerard Avellaneda Domene, Curran Crawford IN: Ocean Engineering 308, 118205, https://doi.org/10.1016/j.oceaneng.2024.118205

Offshore wind-powered CO₂ direct air capture coupled with deep-water, submarine basalt reservoirs has the potential to offer a reliable way to permanently store CO₂ while avoiding grid-energy and land-use competition. This paper analyzes the incorporation of a DAC system into a reference floating wind turbine (FWT) concept, the IEA 15 MW RWT atop the UMaine VolturnUS-S semi-submersible. 

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Enric Prats-Salvado, Nipun Jagtap, Nathalie Monnerie, Christian Sattler IN: Environmental Science & Technology 58 (5), 2282-2292, https://doi.org/10.1021/acs.est.3c08269

Direct air capture (DAC) of CO₂ has gained attention as a sustainable carbon source. One of the most promising technologies currently available is liquid solvent DAC (L-DAC), but the significant fraction of fossil CO₂ in the output stream hinders its utilization in carbon-neutral fuels and chemicals. This study proposes a solar-powered L-DAC approach and develops a model to assess the influence of the location and plant capacity on capture costs. The performed life cycle assessment enables the comparison of technologies based on net CO₂removal, demonstrating that solar-powered L-DAC is not only more environmentally friendly but also more cost-effective than conventional L-DAC.

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Shuangjun Li, Runkai Chen, Junyao Wang, Shuai Deng, Hui Zhou, Mengxiang Fang, Huiyan Zhang, Xiangzhou Yuan IN: npj Materials Sustainability 2, 11, https://doi.org/10.1038/s44296-024-00014-y

Solar thermal energy-assisted direct air capture is widely considered as a novel carbon-negative technical route, innovatively enabling an effective removal of CO₂ directly from ambient air. Here, an advanced concept is introduced that involves the conversion of CO₂ captured by the solar thermal energy-assisted DAC into liquid methanol, simultaneously mitigating climate change and supplying green chemicals.

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Shazia Sharmin Satter, Johnny Saavedra Lopez, Michael L. Hubbard, Yuan Jiang, Robert A. Dagle, Jotheeswari Kothandaraman IN: Green Chemistry, https://doi.org/10.1039/D4GC01244E

Current direct air capture approaches require a significant amount of energy for heating CO₂-sorbed materials for regeneration and for compressing CO₂ for transportation purposes. Rationally designing materials offering both capture and conversion functionalities could enable more energy and cost-efficient DAC and conversion. A single sorbent-catalytic (non-noble metal) material for the Integrated Direct Air Capture and CATalytic (iDAC-CAT) conversion of captured CO₂ into value-added products was developed.

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Keju An, Jamieson Brechtl, Stephen Kowalski, Cheng-Min Yang, Michelle K. Kidder, Costas Tsouris, Christopher Janke, Meghan Lamm, Katie Copenhaver, Josh Thompson, Tugba Turnaoglu, Brian Fricke, Kai Li, Xin Sun, Kashif Nawaz IN: Environmental Science Advances, https://doi.org/10.1039/D4VA00013G

Currently, DAC technologies are deployed mainly in centralized systems and require extensive infrastructure and initial capital cost. A potential solution is to utilize existing infrastructure for DAC. In this study, the authors propose a distributed DAC system that utilizes existing commercial rooftop heating and air conditioning units to capture CO₂ from the air.

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