Characteristics of SrCo1-xFexO3-δ Perovskite Powders with Improved O2/CO2 Production Performance for Oxyfuel Combustion

Perovskite-type oxides are promising oxygen carriers in producing oxygen-enriched CO2 gas stream for oxyfuel combustion. In this study, a new series of SrCo1-xFexO3-delta (x = 0.2, 0.4, 0.6, 0.8) was prepared and used to produce O-2/CO2 mixture gas. The phase, crystal structure, and morphological properties of SrCo1-xFexO3-delta were investigated through X-ray diffraction, specific surface area measurements, and environmental scanning electron microscopy. The oxygen desorption performance of SrCo1-xFexO3-delta was studied in a fixed-bed reactor system. Results showed that the different x values of SrCo1-xFexO3-delta have no obvious effects on crystalline structure. However, the oxygen desorption performance of SrCo1-xFexO3-delta is improved by Co doping. Moreover, SrCo0.8FexO3-delta synthesized via a new EDTA method has a larger BET surface area (40.396 m(2)/g), smaller particle size (48.3 nm), and better oxygen production performance compared with that synthesized through a liquid citrate method.