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

• Published in: Journal of electronic materials 2019-07, Vol.48 (7), p.4351-4361
• Main Authors: Ansari, Anees A., Ahmad, Naushad, Alam, Manawwer, Adil, Syed F., Assal, Mohamed E., Albadri, Abdulrahman, Al-Enizi, Abdullah M., Khan, Mujeeb
• Format: Article
• Language: English
• Subjects: Catalysis; Catalytic activity; Characterization and Evaluation of Materials; Chemical synthesis; Chemistry and Materials Science; Desorption; Dispersion; Electronics and Microelectronics; Energy transmission; Ferrites; Fourier transforms; Infrared analysis; Instrumentation; Lanthanum compounds; Materials Science; Nanocrystals; Optical and Electronic Materials; Optimization; Oxidation; Perovskites; Photoelectrons; Solid State Physics; Specific surface; Spectrum analysis; Stability analysis; Surface area; Surface stability; Thermal stability; Transmission electron microscopy; X ray analysis; X ray photoelectron spectroscopy; X-ray diffraction
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-019-07216-4

La 1− x Ce x FeO 3 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 LaFeO 3 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 La 0.95 Ce 0.05 FeO 3 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.