Stabilization of the cubic perovskite phase was demonstrated in the SrCo0.90_Fe0.10CrO3_0 oxide system at x 0.03. Oxygen permeability of SrCo(Fe, Cr)033 solid solutions was independent of chromium content at x =0.01-0.05. It was found that reducing ceramic grain size dimensions resulted in decreasing thermal expansion electrical conductivity, and oxygen permeability of SrCo(Fe, Cu)030 ceramic membranes. Oxygen transport through SrCo(Fe, M)03. ceramics was shown to be limited by both the bulk ionic conductivity and oxygen exchange currents. The limiting effect of the membrane permeate-side surface on the permeation was higher in comparison with that on the feed-side surface.
IntraductionDense mixed ionic electronic conducting oxide membranes are of considerable interest for industrial processes such as oxygen separation, waste reduction and recovery, coal gasification, and selective oxidation of hydmcarbons.'9 The advan:age of mixed-conductive membranes lies in their infinite theoretical separation factor.'-3 For the oxidation processes, a promising feature is that the oxygen flux may alter the relative presence of different active oxygen species on the membrane surface, thereby providing higher selectivity for partial oxidation reactions.6-9 Moreover, it is possible to omit the preliminary step of purification of oxygen from air.2 Among the most promising groups of mixed conductors are the perovskitelike oxides having high ionic conductivity with a prevailing electronic conductivity.1012 Ceramic membranes of perovskite related oxide phases Sr(CoixFe,.)aOy (a = 1-20, x = 0-0.1) and La(Sr)Co(Fe)039 were used successfully in various extemal conditions.'1-'4 The highest oxygen permeation fluxes are characteristic of
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