Downstream of the CO2 Electrolyzer: Assessing the Energy Intensity of Product Separation

The electrochemical reduction of carbon dioxide (CO2RR) to chemical feedstocks, such as ethylene (C2H4), is an attractive means to mitigate emissions and store intermittent renewable electricity. Much research has focused on improving CO2 electrolysis cell efficiency; less attention has been paid to the downstream purification of outlet product streams. In this work, we model the use of mature downstream separation technologies as part of the overall production of polymer-grade C2H4 from CO2. We find that CO2 removal is the most energy-intensive downstream separation step. We identify opportunities to reduce separation energies to similar to 22 GJ/tonne C2H4 through necessary improvements in C2H4 selectivity (>57%), cathodic CO2 conversion (>80%), and CO2 crossover (0 mol CO2/mol e-). This work highlights the influence of cell performance parameters on downstream separation costs and motivates the development of new, efficient separation processes better suited to the distinctive outlet streams of CO2 electrolyzers.

Automated summary

The study focuses on the downstream purification of ethylene produced from the electrochemical reduction of carbon dioxide, highlighting the energy-intensive CO2 removal step. Opportunities to reduce separation energy through improvements in ethylene selectivity, CO2 conversion, and CO2 crossover are identified, emphasizing the need for new, efficient separation processes tailored to CO2 electrolyzer outlet streams.