Toward economical application of carbon capture and utilization technology with near-zero carbon emission

Kezia Megagita Gerby Langie, Kyungjae Tak, Changsoo Kim, Hee Won Lee, Kwangho Park, Dongjin Kim, Wonsang Jung, Chan Woo Lee, Hyung-Suk Oh, Dong Ki Lee, Jai Hyun Koh, Byoung Koun Min, Da Hye Won () and Ung Lee ()
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Kezia Megagita Gerby Langie: Korea Institute of Science and Technology
Kyungjae Tak: Korea Institute of Science and Technology
Changsoo Kim: Korea Institute of Science and Technology
Hee Won Lee: Korea Institute of Science and Technology
Kwangho Park: Korea Institute of Science and Technology
Dongjin Kim: Korea Institute of Science and Technology
Wonsang Jung: Korea Institute of Science and Technology
Chan Woo Lee: Kookmin University
Hyung-Suk Oh: Korea Institute of Science and Technology
Dong Ki Lee: Korea Institute of Science and Technology
Jai Hyun Koh: Korea Institute of Science and Technology
Byoung Koun Min: Korea Institute of Science and Technology
Da Hye Won: Korea Institute of Science and Technology
Ung Lee: Korea Institute of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Carbon capture and utilization technology has been studied for its practical ability to reduce CO2 emissions and enable economical chemical production. The main challenge of this technology is that a large amount of thermal energy must be provided to supply high-purity CO2 and purify the product. Herein, we propose a new concept called reaction swing absorption, which produces synthesis gas (syngas) with net-zero CO2 emission through direct electrochemical CO2 reduction in a newly proposed amine solution, triethylamine. Experimental investigations show high CO2 absorption rates (>84%) of triethylamine from low CO2 concentrated flue gas. In addition, the CO Faradaic efficiency in a triethylamine supplied membrane electrode assembly electrolyzer is approximately 30% (@−200 mA cm−2), twice higher than those in conventional alkanolamine solvents. Based on the experimental results and rigorous process modeling, we reveal that reaction swing absorption produces high pressure syngas at a reasonable cost with negligible CO2 emissions. This system provides a fundamental solution for the CO2 crossover and low system stability of electrochemical CO2 reduction.

Date: 2022
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DOI: 10.1038/s41467-022-35239-9

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