Bi1.5Y0.3Sm0.2O3-La0.8Sr0.2MnO3-δ dual-phase composite hollow fiber membrane for oxygen separation

Dense Bi1.5Y0.3Sm5.2O3-La0.8Sr0.2MnO3-delta hollow fiber membrane was fabricated by the combined phase inversion/sintering technique. The hollow fiber possessed an asymmetric structure. The oxygen permeability of the hollow fiber was measured by exposing its shell side to ambient air and sweeping the core side with helium to carry away the permeated oxygen. An oxygen permeation flux 3.9x10(-7) mol cm(-2) s(-1) was obtained at 850 degrees C under a gradient of air/helium. The oxygen permeation flux was related to the helium sweeping rate, the length of the hollow fiber and the oxygen partial pressure on the feed side, and can be further increased by modifying the membrane surfaces. (C) 2011 Elsevier B.V. All rights reserved.