Document Type
Article
Publication Date
4-8-2022
Abstract
Conventional hydrogen separations from reformed hydrocarbons often deploy a water gas shift (WGS) reactor to convert CO to CO2, followed by adsorption processes to achieve pure hydrogen. The purified hydrogen is then fed to a compressor to deliver hydrogen at high pressures. Electrochemical hydrogen pumps (EHPs) featuring proton-selective polymer electrolyte membranes (PEMs) represent an alternative separation platform with fewer unit operations because they can simultaneously separate and compress hydrogen continuously. In this work, a high-temperature PEM (HT-PEM) EHP purified hydrogen to 99.3%, with greater than 85% hydrogen recovery for feed mixtures containing 25-40% CO. The ion-pair HT-PEM and phosphonic acid ionomer binder enabled the EHP to be operated in the temperature range from 160 to 220 °C. The ability to operate the EHP at an elevated temperature allowed the EHP to purify hydrogen from gas feeds with large CO contents at 1 A cm-2. Finally, the EHP with the said materials displayed a small performance loss of 12 μV h-1for purifying hydrogen from syngas for 100 h at 200 °C.
Publication Source (Journal or Book title)
ACS Energy Letters
First Page
1322
Last Page
1329
Recommended Citation
Venugopalan, G., Bhattacharya, D., Andrews, E., Briceno-Mena, L., Romagnoli, J., Flake, J., & Arges, C. (2022). Electrochemical Pumping for Challenging Hydrogen Separations. ACS Energy Letters, 7 (4), 1322-1329. https://doi.org/10.1021/acsenergylett.1c02853