Direct capture of carbon dioxide from air via lime-based sorbents

Show simple item record Samari, Mohammad Ridha, Firas Manovic, Vasilije Macchi, Arturo Anthony, Edward J. 2019-03-01T16:46:18Z 2019-03-01T16:46:18Z 2019-02-21
dc.identifier.citation Samari M, Ridha F, Manovic V, et al., (2019) Direct capture of carbon dioxide from air via lime-based sorbents, Mitigation and Adaptation Strategies for Global Change, Volume 25, Issue 1, January 2020, pp. 25-41 en_UK
dc.identifier.issn 1381-2386
dc.description.abstract Direct air capture (DAC) is a developing technology for removing carbon dioxide (CO2) from the atmosphere or from low-CO2-containing sources. In principle, it could be used to remove sufficient CO2 from the atmosphere to compensate for hard-to-decarbonize sectors, such as aviation, or even for polishing gas streams containing relatively low CO2 concentrations. In this paper, the performance of lime-based sorbents for CO2 capture from air in a fixed bed was investigated. The effects of sorbent type, particle diameter, air flow rate, and relative humidity on the breakthrough time, breakthrough shape, and global reaction rate over a series of capture and regeneration cycles were examined. The greatest reaction rates and conversions were obtained when the sorbents were pre-hydrated and inlet air was humidified to 55% relative humidity. Humidifying the air alone leads to axial carbonation gradients since there is competition between CO2 and water with the available CaO. Negligible conversion, over the duration of the experiment, is obtained in a dry system without pre-hydration and humid air. A shrinking-core gas–solid reaction model was fitted to the breakthrough curves in order to estimate the surface reaction and effective diffusion constants. Although the surface reaction constants of the two sorbents were similar, the pelletized limestone had a greater effective diffusivity due to its greater porosity. At mild calcination conditions with air at 850 °C, the pelletized particles maintained their activity over nine carbonation–calcination cycles with a conversion drop of only 9% points. en_UK
dc.language.iso en en_UK
dc.publisher Springer Verlag en_UK
dc.rights Attribution 4.0 International *
dc.rights.uri *
dc.subject Climate change en_UK
dc.subject Direct air capture en_UK
dc.subject Limestone en_UK
dc.subject Calcination en_UK
dc.subject Carbonation en_UK
dc.title Direct capture of carbon dioxide from air via lime-based sorbents en_UK
dc.type Article en_UK

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