Oxygen Permeation of SrFe1.125Co0.375Oy Membrane under the Coupling of CO Oxidation Reaction

Oxygen permeation through dense SrFe1.125Co0.375Oy membranes was studied by exposing one side of the membranes to flowing air and the other side to the mixture of CO and helium. The oxygen permeation flux reached as large as 6.0 × 10- 7mol / cm2s at 900℃. The oxygen permeation showed a weak temperature dependence at temperatures about 850℃. The oxygen flux increased linearly with increasing CO partial pressure and remained almost constant with variation of the membrane thickness. These observations all indicate that the overall oxygen permeation process is limited by the surface reaction at the membrane surface exposed to CO.