Abstract
• Mo-doped BSCF oxide is studied using methods of relaxation and oxygen permeability. • Common quasi-linear kinetic model of the surface reaction is suggested for the two methods. • Quantitative agreement between relaxation and permeation is shown for the surface reaction rate. The kinetic parameters of the reaction of nonstoichiometric oxide Ba 0.5 Sr 0.5 Co 0.75 Fe 0.2 Mo 0.05 O 3-δ with molecular oxygen were determined by two independent methods: the steady-state oxygen permeability of the hollow fiber membrane and the transient kinetics of re-equilibration. To analyze the results, we used mathematical models that take into account the inhomogeneity of conditions in the relaxation reactor and gas flows in the tubular membrane. For a correct comparison of the two methods, the same formulation of the surface reaction rate was used in both models, taking into account the dependence of the reaction rate constant on oxide stoichiometry. As a result, a quantitative agreement was obtained between the values of the equilibrium exchange rate R 0 , including its activation energy, and the dependence on the oxygen partial pressure.
Published Version
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