Essential role of B metal species in perovskite type catalyst structure and activity on toluene oxidation

Abstract

The perovskite type materials with transition metals are getting more attention especially as catalysts in total oxidation reaction. This work explores the B metal effect on the catalytic activity of LaBO 3 structured perovskites in total oxidation of toluene. The perovskite type oxides were obtained by Pechini method and characterized by X-ray diffraction, nitrogen adsorption/desorption isotherms, thermogravimetric analysis and differential scanning calorimetry, temperature-programmed reduction (H 2-TPR), Raman spectroscopy, Fourier transform infrared spectroscopy and particle size analysis. The results showed that LaFeO 3 catalyst contained a single orthorhombic LaFeO 3 phase, while LaMnO 3 contained LaMn 2 O 5 species besides cubic LaMnO 3 phase. Both catalysts show very narrow distributions and average values of 55.59 μm and 51.43 μm for LaMnO 3 and LaFeO 3, respectively.