2002 Volume 45 Issue 1 Pages 32-38
The electronic hole-oxide ionic mixed conducting property in LaGaO3 based oxide doped with Sr and Fe was investigated. It was found that Fe doped LaGaO3 based oxide exhibited a superior mixed conduction, and an extremely large oxygen permeation rate from air to Ar was obtained on La0.7Sr0.3Ga0.6Fe0.4O3. Patial oxidation of CH4 into CO and H2 was further investigated in the membrane reactor using LaGaO3 based oxide as an oxygen separation membrane. In agreement with the simple oxygen permeation measurement, the highest CH4 conversion was achieved at La0.7Sr0.3Ga0.6Fe0.4O3. Therefore, La0.7Sr0.3Ga0.6Fe0.4O3 can permeate oxygen over a wide range of oxygen partial pressure, and the amount of oxygen permeation, such as 8cm3/min cm2 was attained at 1278K through a membrane 0.5mm thickness. The XRD measurement following the CH4 partial oxidation showed that chemical stability of La0.7Sr0.3Ga0.6Fe0.4O3 was satisfactorily high because there was no change in crystal phase was observed.
