Optimization of Redox and Catalytic Performance of LaFeO3 Perovskites: Synthesis and Physicochemical Properties

La1-xCexFeO3 perovskites were synthesized through a citric-acid assisted co-precipitation process. X-ray diffraction, transmission electron microscopy, energy dispersive x-ray analysis, thermogravimetric analysis, UV/Vis absorption spectroscopy, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, and an N-2-adsorption-desorption technique were applied for characterization of the perovskites. The x-ray analysis exhibited highly purified single-phase orthorhombic nanocrystals. The loading of Ce improved the specific surface area and affects the thermal stability along with the O-2 desorption characteristics. The BET analysis and textural characterization of a high concentration of the Ce-ion-doped LaFeO3 perovskite revealed a relatively high specific surface area with respect to a low concentration of the doped perovskites, indicating the homogeneous dispersion of Ce ions within the crystal matrix. The oxidation states of trivalent La, Fe, O, and C in all perovskites were identified through an XPS study. The redox behavior was examined using temperature program reduction/oxidation techniques. The La0.95Ce0.05FeO3 perovskites exhibited a high specific surface area and the best redox, catalytic, and reusability performances among the prepared catalysts, as revealed by the TPR/TPO, BET, and catalytic activity analyses.