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Molten ionic oxides for CO2 capture at medium to high temperatures

Author(s)
Harada, Takuya; Halliday, Cameron; Jamal, Aqil; Hatton, T. Alan
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Abstract
The development of efficient low cost CO2 capture systems is a critical challenge for mitigating climate change while meeting global energy demand. Herein, we demonstrate the first liquid absorbents for CO2 capture at medium to high temperatures (500 to 700° C). Molten ionic oxides based on sodium borate and the mixed alkali-metal borates show remarkably fast kinetics and intrinsic regenerability, with no observable deterioration in performance over multiple absorption–desorption cycles under both temperature- and pressure-swing operations. The behavior of the molten ionic oxides is ascribed to the instantaneous formation of carbonate ions in the molten oxides without the diffusional transport restrictions imposed by solid product layers characteristic of solid adsorbents. The new liquid absorbents will enable continuous processing and thermal integration via a simple absorber–desorber arrangement, thereby overcoming the challenges previously restraining high temperature CO2 capture and opening up new opportunities in clean energy production. ©2019
Date issued
2019
URI
https://hdl.handle.net/1721.1/124879
Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Journal
Journal of Materials Chemistry A
Publisher
Royal Society of Chemistry (RSC)
Citation
Harada, Takuya, Cameron Halliday, Aqil Jamal, and T. Alan Hatton, "Molten ionic oxides for CO2 capture at medium to high temperatures." Journal of Materials Chemistry A 7, 38 (Oct. 2019): p. 21827-34 doi 10.1039/c9ta09122j ©2019 Author(s)
Version: Final published version
ISSN
2050-7488
2050-7496
Keywords
Renewable Energy, Sustainability and the Environment, General Materials Science, General Chemistry

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