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January 24, 2026Chemie Ingenieur Technik0 citationsOpen Access

Integration of High‐ p , Low‐ T CO 2 Electrolysis with Pressure Swing Adsorption Purification

MPMartin Peters SBSupriya Bhaskaran FBFranz Bommas

Key Points

The research aims to integrate CO2 electrolysis with pressure swing adsorption to improve CO yield and purity.
Coupled a high-pressure low-temperature CO2 electrolysis cell with a pressure swing adsorption unit.
Compared cascade and full-recycle operational modes.
Analyzed CO2-rich and diluted CO2 feed impacts on selectivity and conversion.
Measured purity of product gases and overall CO yield.
CO selectivity was >90% with CO2-rich feeds, dropping to 75.3% with diluted CO2.
PSA yield varied between 25.4% and 33.4% based on the input CO2 concentration.
Full recycle yields were 99.99% CO, compared to ≈6% in cascade operation.
End-of-life LTCE showed possible near-quantitative CO yield of 99.6%.

Abstract

Abstract Herein, a high‐pressure low‐temperature CO 2 electrolysis (LTCE) cell is coupled with a pressure swing adsorption (PSA) unit to maximize CO production and product‐gas purity to compare cascade and full‐recycle operation. The inlet CO 2 governs LTCE selectivity with CO 2 ‐rich feeds yielding CO >90% with minimal H 2 , with CO 2 conversion being 22.4%; diluted CO 2 <70 vol.% lowers CO selectivity to 75.3%. Similarly, PSA yield ranges between 25.4 and 33.4% depending on the input CO concentration, enabling negligible CO 2 in the product (≤0.025 vol.%). Compared to the cascade (≈6% CO yield), the full recycle system yields 99.99% CO (88.3 vol.% CO). Even at end‐of‐life scenarios for the LTCE cell with CO selectivity ≈35% near quantitative CO yield (99.6%) in recycle operation is possible.

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