Perovskite-type Co/Ti-substituted Ba0.15Sr0.85FeO3-δ as oxygen storage materials for oxygen enrichment application: structural, sintering, and temperature-swing oxygen sorption uptake properties at high temperatures

Perovskite-type Ba0.15Sr0.85FeO3-delta and Co/Ti-substituted Ba0.15Sr0.85B0.15Fe0.85O3-delta (B=Co, Ti) oxides were prepared by the solid-state reaction method. Structural stability, sintering microstructures, and temperature-swing oxygen sorption uptake properties of the Ba(0.15)Sr(0.85)FeO(3-delta )and Co/Ti-doped Ba0.15Sr0.85B0.15Fe0.85O3-delta (B=Co, Ti) oxides, were investigated by in situ high-temperature X-ray diffraction (XRD), scanning electron microscopy-energy dispersion spectra (SEM-EDS), and thermogravimetry (TG) techniques. Crystal parameters and thermal expansion coefficients (CTEs) for the Ba0.15Sr0.85FeO3-delta and Co/Ti-substituted Ba o is Ba0.15Sr0.85B0.15Fe0.85O3-delta (B=Co, Ti) oxides were obtained. The high-temperature oxygen sorption uptake properties (by the temperature-swing manner from 300 degrees C up to 850, 900, and 925 degrees C) of Ba0.15Sr0.85FeO3-delta and Co/Ti-substituted Ba0.15Sr0.85B0.15Fe0.85O3-delta (B=Co, Ti) oxides, were investigated under the flowing air atmosphere by a dynamic TG technique. The oxygen sorption uptake capacities of 16.8, 17.5, 15.4 mL O-2 (STP)/g oxide for the as-synthesized Ba0.15Sr0.85FeO3-delta and Ba0.15Sr0.85B0.15Fe0.85O3-delta (B=Co, Ti) oxide powders are obtained in the intermediate temperature range of 300-850 degrees C, respectively. [GRAPHICS] .