催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (11): 1791-1796.DOI: 10.1016/S1872-2067(11)60442-7

• 研究论文 • 上一篇    下一篇

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

Taymaz TABARI1, Haman TAVAKKOLI2,*   

  1. 1Department of Chemistry, Faculty of Sciences, Gorgan Branch, Islamic Azad University, Gorgan, Iran; 2Department of Chemistry, Science and Research Branch, Islamic Azad University, Khouzestan, Iran
  • 收稿日期:2012-06-18 修回日期:2012-08-14 出版日期:2012-11-16 发布日期:2012-11-16

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

Taymaz TABARI1, Haman TAVAKKOLI2,*   

  1. 1Department of Chemistry, Faculty of Sciences, Gorgan Branch, Islamic Azad University, Gorgan, Iran; 2Department of Chemistry, Science and Research Branch, Islamic Azad University, Khouzestan, Iran
  • Received:2012-06-18 Revised:2012-08-14 Online:2012-11-16 Published:2012-11-16

PDF

898

摘要： LaFe0.9Co0.1O3 (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.

关键词: perovskite-type oxide, nanopowder, oxidation of thiols, sol-gel method

Abstract: LaFe0.9Co0.1O3 (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