New carbon capture method

Industry Discussions Renewable Energy
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Direct Air Capture: Recyclability and Exceptional CO2 Uptake Using a Superbase
Gorji et al.
https://pubs.acs.org/doi/10.1021/acs.est.5c13908
Abstract:
Direct air capture (DAC) of CO2 presents challenges owing to its low concentration and the high humidity of ambient air. In this study, efficient and reversible CO2 capture from humid air was achieved using a liquid absorbent derived from a deep eutectic solvent (DES), composed of 1,5,7-triazabicyclo [4.3.0] non-6-ene (TBN) and benzyl alcohol. Unlike conventional superbases, TBN-containing DES exhibits an exceptional absorption capacity of 0.154 gCO2/gDES (3.5 mmol/g, 1.25 mol/mol) from untreated ambient air (humidity above 90%). The DES underwent 100 absorption–desorption cycles, retaining 74% of its CO2 capture capacity after 50 cycles and 50% after 100 cycles. High stability, low toxicity, very high capture capacity, recyclability, and moisture insensitivity characterize this outstanding sorbent, making it suitable for DAC. This absorbent desorbs CO2 at just 70 °C within 30 min, effectively addressing one of the most challenging steps in DAC. According to the literature survey, this unique DES outperforms all previously reported liquid absorbents for DAC in terms of recyclability, efficiency, and practicality.

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The most efficient way to capture CO2 is from the exhaust gas from a gas fired boiler. Cool to remove water vapor. If air is used, you get a mixture of CO2 and nitrogen and CO2 should be condensable as dry ice. Or burn w oxygen to get higher purity.

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The temperature range needed for the new method is smaller than one involving dry ice. Wouldn’t that help make it more energy efficient?

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