Preparation and oxygen permeation property of (SrCo_(0.8)Fe_(0.2)O_(3-δ))_(0.9)(SrZrO_3)_(0.1) hollow fiber membrane

Dual-phase hollow fiber membrane SrCo0.8Fe0.2O3-δ-SrZrO3(10 mol%) was prepared using the phase-inversion method.The hollow fiber had a dimension of 0.25 mm in thickness,1.70 mm in outer diameter.The oxygen permeability of the hollow fiber was measured by exposing its shell side to ambient air and sweeping the tube side with high purity helium to carry away the permeated oxygen.An oxygen flux as large as 1.42 ml·cm-2·min-1 was obtained at 950 ℃.The permeation flux expectedly increased with temperature,and the apparent activation energy was calculated to be 35.3±1.6 kJ/mol in the temperature range of 850~950 ℃.The oxygen permeation flux also increased with the increase in the helium sweeping rate corresponding to a lower oxygen partial pressure at the tube side.A plug-flow model in combination with the Wagner theory was used to simulate the oxygen permeation process.The simulation results were in fair agreement with the measured permeation data.