A CO2‐stable hollow‐fiber membrane with high hydrogen permeation flux

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Abstract
A Mo‐substituted lanthanum tungstate mixed proton‐electron conductor, La5.5W0.6Mo0.4O11.25−δ (LWM04), was synthesized using solid state reactions. Dense U‐shaped LWM04 hollow‐fiber membranes were successfully prepared using wet‐spinning phase‐inversion and sintering. The stability of LWM04 in a CO2‐containing atmosphere and the permeation of hydrogen through the LWM04 hollow‐fiber membrane were investigated in detail. A high hydrogen permeation flux of 1.36 mL/min cm2 was obtained for the U‐shaped LWM04 hollow‐fiber membranes at 975°C when a mixture of 80% H2−20% He was used as the feed gas and the sweep side was humidified. Moreover, the hydrogen permeation flux did not significantly decrease over 70 h of operation when fed with a mixture containing 25% CO2, 50% H2, and 25% He, indicating that the LWM04 hollow‐fiber membrane has good stability under a CO2‐containing atmosphere. © 2015 American Institute of Chemical Engineers AIChE J, 61: 1997–2007, 2015
Funding Information
  • National Science Fund for Distinguished Young Scholars of China (21225625)
  • Natural Science Foundation of China (21176087)
  • Sino-German Center for Science Promotion (GZ 911)

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