The potential of direct air capture using adsorbents in cold climates

Global warming threatens the entire planet, and solutions such as direct air capture (DAC) can be used to meet net-zero goals and go beyond. This study investigates using DAC in a 5-step temperature vacuum swing adsorption (TVSA) cycle with adsorbents’ Li-X and Na-X, readily available industrial zeo...

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Bibliographic Details
Published in:iScience
Main Author: Wilson, Sean M.W.
Format: Text
Language:English
Published: Elsevier 2022
Subjects:
Article
Canada
Greenland
Antarc*
Antarctica
Alaska
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9720019/
https://doi.org/10.1016/j.isci.2022.105564
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Summary:Global warming threatens the entire planet, and solutions such as direct air capture (DAC) can be used to meet net-zero goals and go beyond. This study investigates using DAC in a 5-step temperature vacuum swing adsorption (TVSA) cycle with adsorbents’ Li-X and Na-X, readily available industrial zeolites, to capture and concentrate CO(2) from air in cold climates. From this study, we report that Na-X in cold conditions has the highest known CO(2) adsorption capacity in air of 2.54 mmol/g. This combined with Na-X's low CO(2) heat of adsorption, and fast uptake-rate in comparison to other benchmark materials, allowed for Na-X operating in cold conditions to have the lowest reported DAC operating energy of 1.1 MWh/tonCO(2). These findings from this study show the promise of this process in cold climates of Canada, Alaska, Greenland, and Antarctica to be part of the solution to global warming.

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