Reactive capture of CO<sub>2</sub> via amino acid.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39245666.
- Also identified by DOI 10.1038/s41467-024-51908-3 and PMC identifier 11381538.
- Licence recorded as CC BY-NC-ND.
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Abstract
Reactive capture of carbon dioxide (CO<sub>2</sub>) offers an electrified pathway to produce renewable carbon monoxide (CO), which can then be upgraded into long-chain hydrocarbons and fuels. Previous reactive capture systems relied on hydroxide- or amine-based capture solutions. However, selectivity for CO remains low (<50%) for hydroxide-based systems and conventional amines are prone to oxygen (O<sub>2</sub>) degradation. Here, we develop a reactive capture strategy using potassium glycinate (K-GLY), an amino acid salt (AAS) capture solution applicable to O<sub>2</sub>-rich CO<sub>2</sub>-lean conditions. By employing a single-atom catalyst, engineering the capture solution, and elevating the operating temperature and pressure, we increase the availability of dissolved in-situ CO<sub>2</sub> and achieve CO production with 64% Faradaic efficiency (FE) at 50 mA cm<sup>-2</sup>. We report a measured CO energy efficiency (EE) of 31% and an energy intensity of 40 GJ t<sub>CO</sub><sup>-1</sup>, exceeding the best hydroxide- and amine-based reactive capture reports. The feasibility of the full reactive capture process is demonstrated with both simulated flue gas and direct air input.