期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 259, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.118023
关键词
Ceramic hollow fiber membrane; Oxygen separation; Oxygen transport; CO2 resistance; Mixed ionic electronic conductor
资金
- German Federal Ministry of Education and Research [03SFK2S3]
The study investigated the effects of grain size and wall thickness on the oxygen transport mechanism of (La0.6Ca0.4)(Co0.8Fe0.2)O3-delta hollow fiber membranes, revealing that larger grain sizes and thinner walls result in increased oxygen flux up to 6.2 ml min(-1) cm(-2) in a 50% CO2 atmosphere at 1000 degrees C. This suggests that grain boundaries act as oxygen diffusion barriers.
The effects of grain size and wall thickness on the oxygen transport mechanism of (La0.6Ca0.4)(Co0.8Fe0.2)O3-delta hollow fiber membranes were investigated. For this purpose, hollow fiber membranes of different geometry were prepared with different spinnerets via phase inversion spinning and subsequently sintered at different temperatures. The influence of the manufacturing conditions on the LCCF microstructure were analysed by SEM, XRD and TEM. With increasing sintering temperature, the grain size increased from 0.4 mu m(2) at 1070 degrees C to 19.5 mu m(2) at 1245 degrees C. With bigger grain sizes and lower wall thickness, the oxygen flux shows an increase up to 6.2 ml min(-1) cm(-2) (at 1000 degrees C) in a 50% CO2 atmosphere. This finding implies that the grain boundaries act as oxygen diffusion barriers.
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