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Electrochemical Pumping for Challenging Hydrogen Separations
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DOI：10.1021/acsenergylett.1c02853.png)
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Abstract
En 中文
Conventional hydrogen separations from reformedhydrocarbons often deploy a water gas shift (WGS) reactor to convertCO to CO2, followed by adsorption processes to achieve pure hydrogen.The purified hydrogen is then fed to a compressor to deliver hydrogenat high pressures. Electrochemical hydrogen pumps (EHPs) featuringproton-selective polymer electrolyte membranes (PEMs) represent analternative separation platform with fewer unit operations because theycan simultaneously separate and compress hydrogen continuously. Inthis work, a high-temperature PEM (HT-PEM) EHP purified hydrogento 99.3%, with greater than 85% hydrogen recovery for feed mixturescontaining 25-40% CO. The ion-pair HT-PEM and phosphonic acidionomer binder enabled the EHP to be operated in the temperaturerange from 160 to 220 degrees C. The ability to operate the EHP at an elevated temperature allowed the EHP to purify hydrogenfrom gas feeds with large CO contents at 1 A cm-2. Finally, the EHP with the said materials displayed a small performance lossof 12 mu Vh-1for purifying hydrogen from syngas for 100 h at 200 degrees C.
Keywords:
PRESSURE SWING ADSORPTION
PURIFICATION
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