Flow-electrode capacitive separation of organic acid products and recovery of alkali cations after acidic CO₂ electrolysis.

ABSTRACT: Acidic CO₂ electrolysis, enhanced by the introduction of alkali cations, presents a strategic approach for improving carbon efficiency compared to processes conducted in neutral and alkaline environments. However, a significant challenge arises from the dissolution of both organic acids and alkali cations in a strongly acidic feed stream, resulting in a considerable energy penalty for downstream separation. In this study, we investigate the feasibility of using flow-electrode capacitive deionization (FCDI) technology to separate organic acids and recover alkali cations from a strongly acidic feed stream (pH ~ 1). We show that organic acids, such as formic acid and acetic acid, are retained in molecular form in the separation chamber, achieving a rejection rate of over 90% under

SUBMITTER: Jiang Y 

PROVIDER: S-EPMC11474086 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature