A tubular membrane made of Zr0.8Y0.2O1.9 (60vol%) and La0.8Sr0.2CrO3-δ was prepared, and O permeation through the membrane tube was examined by exposing its outer shell to air and sweeping its inner wall with pure He, or CO balanced with He. An O flux of 9.2 x 10−9mol/cm2s was measured at 950C under an air/He gradient, and a larger flux of 3.2 x 10−8mol/cm2s was measured at 930C under an air/CO gradient. The membrane tube was found to exhibit excellent stability in highly reducing atmospheres, and at high temperatures. The O permeation rate was expected to be increased by the modification of the surface and a reduction in membrane thickness.

Oxygen Permeation and Stability of Zr0.8Y0.2O0.9‒La0.8Sr0.2CrO3-δ Dual-Phase Composite. B.Wang, M.Zhan, D.Zhu, W.Liu, C.Chen: Journal of Solid State Electrochemistry, 2006, 10[8], 625-8