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Part 1.-Synthesis and characterization of Bi , (0.1∏x∏0.25

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Oxygen permeation fluxes through dense SrCo0.80Fe0.20O3-5 discs have been measured in the temperature range of 620-920 °C under various oxygen partial pressure gradients. The permeation results are compared with the previous measurements. Below 800 *C, the apparent activation energy for the overall permeation is 22±4 kcal/mol. The permeation results are discussed in light of the phase diagram of SrCo0.80Fe0.2003-8. Based on experiments in which the membrane thickness is varied, we propose that the surface exchange process is the ratelimiting step in the overall permeation reaction. Preliminary catalytic studies of methane partial oxidation in a membrane reactor are reported.