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Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power
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Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power
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Journal Article
Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power
2018
Overview
Using negative emissions technologies for the net removal of greenhouse gases from the atmosphere could provide a pathway to limit global temperature rises. Direct air capture of carbon dioxide offers the prospect of permanently lowering the atmospheric CO
2
concentration, providing that economical and energy-efficient technologies can be developed and deployed on a large scale. Here, we report an approach to direct air capture, at the laboratory scale, using mostly off-the-shelf materials and equipment. First, CO
2
absorption is achieved with readily available and environmentally friendly aqueous amino acid solutions (glycine and sarcosine) using a household humidifier. The CO
2
-loaded solutions are then reacted with a simple guanidine compound, which crystallizes as a very insoluble carbonate salt and regenerates the amino acid sorbent. Finally, effective CO
2
release and near-quantitative regeneration of the guanidine compound are achieved by relatively mild heating of the carbonate crystals using concentrated solar power.
Direct air capture of CO
2
could contribute to negative emissions, but more effective technologies to increase its viability are still required. Here, Brethomé et al. demonstrate lab-scale direct air capture using a two-stage capture cycle and concentrated solar power for CO
2
release.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
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