Fabrication and Characterization of Perovskite-type Oxide LaFe0.9Co0.1O3 Nanoparticles and Its Performance in Aerobic Oxidation of Thiols to Disulfide

doi:10.1016/S1872-2067(11)60442-7

Abstract

Abstract: LaFe_0.9Co_0.1O₃ (LFCO) perovskite nanoparticles were prepared using a sol-gel method. The physical and chemical properties of the catalyst were determined using X-ray diffraction (XRD), transmission electron microscopy, scanning electron microscopy, scanning tunneling microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis, and Fourier-transform infrared spectroscopy. The catalytic activity of the sample was evaluated using aerobic oxidation of thiols to disulfides. The XRD results indicated that the LFCO had a good crystalline phase at 750 °C. The experimental data revealed that the LFCO particles were nano-sized. LFCO nanoparticles can catalyze the oxidation of various thiols, including aromatic and aliphatic thiols. The effects of reaction parameters such as temperature, solvent, and the amount of catalyst on the oxidation of 4-chlorothiophenol were investigated. In comparison with reactions using the corresponding neat complexes, i.e., Co(NO₃)₂·6H₂O and Fe(NO₃)₃·9H₂O, higher yields were obtained in the oxidation reaction catalyzed by LFCO nanoparticles.

Key words: perovskite-type oxide, nanopowder, oxidation of thiols, sol-gel method

Taymaz TABARI, Haman TAVAKKOLI. Fabrication and Characterization of Perovskite-type Oxide LaFe_0.9Co_0.1O₃ Nanoparticles and Its Performance in Aerobic Oxidation of Thiols to Disulfide[J]. Chinese Journal of Catalysis, 2012, 33(11): 1791-1796.

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Fabrication and Characterization of Perovskite-type Oxide LaFe_0.9Co_0.1O₃ Nanoparticles and Its Performance in Aerobic Oxidation of Thiols to Disulfide

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