LaFeO3-δ and SrFeO3-δ perovskites were prepared by the modified Pechini method. The chemicals used for catalyst synthesis: La(NO3)3•6H2O (99.99% purity), Sr(NO3)2•6H2O (99.0% purity), Fe(NO3)3•9H2O (99.95% purity), ethylenediaminetetraacetic acid (EDTA, ACS reagent, 99.4-100.6%), citric acid (99.5-100.5%), and ammonium hydroxide (28.0-30.0% NH3 basis) were purchased from Sigma-Aldrich. Stoichiometric ratios of metal nitrates were thoroughly mixed with deionized water to form metal nitrate aqueous solution along with EDTA (EDTA to metal ion ratio of 1:1). Appropriate amounts of citric acid were added to this nitrate-EDTA mixture (citric acid to metal ion ratio of 1.5:1), with the ammonium hydroxide used to maintain a solution pH of 5 to form the precursor solution. The precursor solution was slowly heated to 80°C and allowed to homogenously mix for 30 minutes. Subsequently, the temperature of the homogenous precursor solution was increased to 150°C to enable water evaporation until a viscous gel was formed, which then self-ignited to form an ash-like material. The ash-like material was subsequently ground and then calcined in air at 900°C for 3 hours to form the catalyst powder.