Characteristics of SrCo1-xFexO3-δ perovskite powders with improved O2/CO2 production performance for oxyfuel combustion

Abstract

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-δ (x = 0.2, 0.4, 0.6, 0.8) was prepared and used to produce O2/CO2 mixture gas. The phase, crystal structure, and morphological properties of SrCo1-xFexO3-δ were investigated through X-ray diffraction, specific surface area measurements, and environmental scanning electron microscopy. The oxygen desorption performance of SrCo 1-xFexO3-δ was studied in a fixed-bed reactor system. Results showed that the different x values of SrCo 1-xFexO3-δ have no obvious effects on crystalline structure. However, the oxygen desorption performance of SrCo 1-xFexO3-δ is improved by Co doping. Moreover, SrCo0.8Fe0.2O3-δ synthesized via a new EDTA method has a larger BET surface area (40.396 m2/g), smaller particle size (48.3 nm), and better oxygen production performance compared with that synthesized through a liquid citrate method.