Work

Electrochemical CO 2 Reduction to Ethanol: Comparison of Cell Designs, Process Modeling, Downstream Processes, and Techno-Economic Assessments

Year: 2025

Type: article

Abstract: The electrochemical carbon dioxide reduction reaction (CO2RR) is of increasing importance for the development of a closed carbon cycle. Ethanol is an attractive target product due to its high energy density and large market size. Therefore, publications describing the CO2RR to ethanol are first compared. Both flow cells and zero-gap cells show the most promising results. However, this work has shown that accumulation of liquid organic products in the catholyte of a flow cell would lead to a significant increase in the overpotential. The resulting low concentration of products in the catholyte (<3.5 mol %), which should not be exceeded, leads to high separation costs. Consequently, a downstream process is developed based on the product stream of the most promising CO2RR in a zero-gap cell. Afterward, a techno-economic assessment (TEA) of the entire process from CO 2 capture to CO2RR to product purification was performed. The electricity for the CO2RR is still the main cost driver, followed by the CO 2 recovery, whose costs are caused by the low single-pass CO 2 conversion. Strategies for improving the entire process are outlined, and an Excel calculation tool for adapting the TEA is provided.

Source: Industrial & Engineering Chemistry Research

DOI: 10.1021/acs.iecr.4c04102

Authors: Marvin Dorn, Felix Frantzen, Sabine Kareth, Eckhard Weidner, Marcus Petermann

Institution: Ruhr University Bochum

Language: English

Topic: CO2 Reduction Techniques and Catalysts

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDGs: Affordable and clean energy, Climate action, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $4,500