Kuo et al. (2023): Dual Salt Cation-Swing Process for Electrochemical CO2 Separation

Fang-Yu Kuo, Sung Eun Jerng, Betar M. Gallant IN: ACS Central Science, https://doi.org/10.1021/acscentsci.3c00692

Herein, the authors report an electrochemical cation-swing process that is able to reversibly modulate the CO₂ loading on liquid amine sorbents in dimethyl sulfoxide (DMSO) solvent. The process exploits a reversible carbamic acid-to-carbamate conversion reaction that is induced by changing the identity of Lewis acid cations (e.g. K⁺, Li⁺, Ca²⁺, Mg²⁺, and Zn²⁺) coordinated to the amine-CO₂ adduct in the electrolyte. Using ethoxyethylamine (EEA) as a model amine, they present NMR-based speciation studies of carbamic acid-to-carbamate conversion as a function of amine/salt concentrations and cation identity. 

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