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 Ba 0.15 Sr 0.85 FeO 3-δ and Co/Ti-substituted Ba 0.15 Sr 0.85 B 0.15 Fe 0.85 O 3-δ (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-δ and Co/Ti-doped Ba 0.15 Sr 0.85 B 0.15 Fe 0.85 O 3-δ (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 Ba 0.15 Sr 0.85 FeO 3-δ and Co/Ti-substituted Ba 0.15 Sr 0.85 B 0.15 Fe 0.85 O 3-δ (B=Co, Ti) oxides were obtained. The high-temperature oxygen sorption uptake properties (by the temperature-swing manner from 300 °C up to 850, 900, and 925 °C) of Ba 0.15 Sr 0.85 FeO 3-δ and Co/Ti-substituted Ba 0.15 Sr 0.85 B 0.15 Fe 0.85 O 3-δ (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 Ba 0.15 Sr 0.85 FeO 3-δ and Ba 0.15 Sr 0.85 B 0.15 Fe 0.85 O 3-δ (B=Co, Ti) oxide powders are obtained in the intermediate temperature range of 300–850 °C, respectively. Graphical abstract