Electroreduction of CO2 to CO Paired with 1,2-Propanediol Oxidation to Lactic Acid: Toward an Economically Feasible System

Elena Pérez-Gallent, Susan Turk, Roman Latsuzbaia, Anca Anastasopol, Francesc Sastre-Calabuig, Amanda Cristina Garcia, Erwin Giling, Earl Goetheer

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
57 Downloads (Pure)

Abstract

In industrial electrochemical processes it is of paramount importance to achieve efficient, selective processes to produce valuable chemicals while minimizing the energy input. Although the electrochemical reduction of CO 2 has received a lot of attention in the past decades, an economically feasible process has not yet been developed. Typically, the electrochemical reduction of CO 2 is paired to water oxidation, forming oxygen, but an alternative strategy would be coupling the CO 2 reduction reaction to an oxidation in which a higher-value product is co-produced, significantly improving the economic feasibility for CO 2 reduction as a whole. Importantly, both reactions need to be chosen wisely to ensure their compatibility and to minimize the voltage requirements for the redox system. In this study, as an example of this approach, we demonstrate such a match: the electroreduction of CO 2 to CO, paired with the electrooxidation of 1,2-propanediol to lactic acid. Combining these reactions decreases energy consumption by 35%, increases product value of the system, and results in combined faradaic efficiencies of up to 160% when compared to the CO 2 reduction reaction in which oxygen is formed in the anode.

Original languageEnglish
Pages (from-to)6195-6202
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number16
DOIs
Publication statusPublished - 2019

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