Publication Date:
2023-12-12
Description:
〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Reducing carbon dioxide to value‐added chemicals by electrolysis is a promising strategy to substitute fossil‐based processes. Research on CO〈sub〉2〈/sub〉 electrolysis has vastly progressed, focusing on catalysis and electrode design, leaving an essential question on the central part of the electrolyzer: Which type of ion exchange membrane is best suited for CO〈sub〉2〈/sub〉 electrolysis from an economic perspective? To address this question, holistic process optimization of CO〈sub〉2〈/sub〉 reduction and product purification is applied. The findings demonstrate that CO〈sub〉2〈/sub〉 electrolysis with an anion exchange membrane shows competitive production costs for CO of 796 €/t〈sub〉CO〈/sub〉, outperforming cation exchange and bipolar membranes. Unlike often described, the CO〈sub〉2〈/sub〉 pumping effect does not significantly impair the economics but offers an efficient indirect regeneration of dissociated CO〈sub〉2〈/sub〉. Furthermore, the results emphasize selective reduction of CO〈sub〉2〈/sub〉 rather than co‐electrolysis of CO〈sub〉2〈/sub〉 and H〈sub〉2〈/sub〉O. While pointing to a positive economic perspective, life‐cycle assessment highlights the need to minimize CO〈sub〉2〈/sub〉 emissions related to electricity consumption and incomplete CO〈sub〉2〈/sub〉 utilization.〈/p〉
Description:
〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Holistic optimization of CO〈sub〉2〈/sub〉 electrolysis and downstream processing highlighted an electrolyzer with an anion exchange membrane to be the most economical for CO production. Interestingly, the CO〈sub〉2〈/sub〉 pumping effect offers an efficient indirect regeneration of dissociated CO〈sub〉2〈/sub〉. Moreover, selective CO〈sub〉2〈/sub〉 reduction is emphasized from economic and ecological assessment, demanding mitigation of CO〈sub〉2〈/sub〉 emissions related to electricity consumption and incomplete utilization.
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Keywords:
ddc:333.7
;
carbon utilization
;
electrochemical CO2 reduction
;
holistic process optimization
;
life‐cycle assessment
;
techno‐economic assessment
Language:
English
Type:
doc-type:article
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