Oxy-fuel combustion is one of the proposed technologies which have the potential to achieve a zero CO₂ emission. To enhance the oxygen production performance of the oxygen carrier, different LaBO_3-δ (B=Co, Ni, Fe, Cr) and metal oxide (CeO₂, Al₂O₃, ZrO₂) supported BaCoO_3-δ perovskites have been successfully synthesized by the EDTA sol-gel method and further applied for producing oxygen. The oxygen desorption/production performance of synthesized perovskites were studied in a fixed-bed reactor system. Furthermore, the effects of H₂O and air as regeneration gas of metal oxide supported BaCoO_3-δ perovskite oxygen carrier were investigated in detail. Results shows that the oxygen desorption amount of different B-site substituted LaBO_3-δ (B=Co, Ni, Fe, Cr) perovskites decrease in the order of LaNiO_3-δ > LaCoO_3-δ > LaCrO_3-δ > LaFeO_3-δ.While compared with pure BaCoO_3-δ and different metal oxide supported BaCoO_3-δ, CeO₂ supported BaCoO_3-δ features higher production amount of oxygen. Multiple cycles demonstrated that BaCoO₃/CeO₂ displays higher stability and regeneration capacity, which is the key factor to provide stable O₂/CO₂ gas stream for oxyfuel combustion application. In short, the novel BaCoO₃/CeO₂ oxygen carrier developed in this work exhibits high oxygen desorption capacity and stability. In addition, it provides a promising potential for oxygen production in industrial application.

Keywords: CO₂ capture; Oxygen carrier; Supported-perovskite; Oxygen production