A novel heterogeneous La0.8Sr0.2CoO3-delta/(La0.5Sr0.5)(2)CoO4+delta dual-phase membrane for oxygen separation

作者：Han, Ning; Wang, Wei; Zhang, Shuguang; Sunarso, Jaka^*; Zhu, Zhonghua; Liu, Shaomin

来源：Asia-Pacific Journal of Chemical Engineering, 2018, 13(5): e2239.

DOI：10.1002/apj.2239

• decoration
• dual-phase membrane
• hetero-interface
• hollow fiber
• oxygen permeation

Dual-phase membrane is an attractive concept that combines the advantages of two different phases into single membrane matrix. The recently reported significant enhancement of oxygen surface kinetics on the La0.8Sr0.2CoO3-delta (LSC)/(La0.5Sr0.5)(2)CoO4+delta (LSC214) hetero-interface due to the formation of fast oxygen transport paths along hetero-interface is adopted into dual-phase membrane to achieve enhanced oxygen permeability. The 1300 degrees C sintered LSC/LSC214 (4:1 weight ratio) hollow fiber displayed a maximum oxygen flux of 3.35ml.min(-1).cm(-2) at 900 degrees C and 200mlmin(-1) helium sweep gas flow rate, which represents up to 80% enhancement relative to that of the 1300 degrees C sintered LSC hollow fiber at the same experimental condition. Such enhancement is enabled by the enlargement of triple phase boundaries to larger areas across the membrane surface for dual-phase case as confirmed by the significantly lower area specific resistance for LSC/LSC214 vertical bar Ce0.8Sm0.2O1.9 (SDC)vertical bar LSC/LSC214 relative to LSC vertical bar SDC vertical bar LSC symmetrical cell between 600 degrees C and 800 degrees C. This nominal dual-phase LSC/LSC214 hollow fiber also showed very stable fluxes of 3.3 and 2.3ml.min(-1).cm(-2) during 300-hr permeation test at 900 degrees C and 850 degrees C, respectively.

• 出版日期2018-10
• 单位山东理工大学