Preparation and Characterization of La0.9Sr0.1Co0.5Mn0.5O3 Composite Catalytic Materials for Conversion of Exhaust Gas from Natural Gas Automobiles
A series of rare earth perovskite-type oxides La0.9Sr0.1CoO3, La0.9Sr0.1MnO3 and La0.9Sr0.1Co0.5Mn0.5O3 were prepared by sol-gel method and characterized by X-ray diffraction (XRD), specific surface analysis (BET), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) techniques. The results showed that for La0.9Sr0.1Co0.5Mn0.5O3 sample, Sr2+ and Mn3+ ions partly replaced La3+ and Co3+ ions and entered perovskite crystal lattice, and finally a perfect crystal structure of perovskite was formed. Moreover, these powders presented sphericity granules with particle size of about 20nm and satisfactory pore structure. With the doping of Sr2+ ions in a certain range, the coexisting system of Mn3+- Mn4+ and Co3+- Co4+ as well as the concentration of oxygen vacancies were increased, thus leading to the higher catalytic activity of the prepared catalysts.
Jinsheng Liang and Lijuan Wang
X. F. Zhang et al., "Preparation and Characterization of La0.9Sr0.1Co0.5Mn0.5O3 Composite Catalytic Materials for Conversion of Exhaust Gas from Natural Gas Automobiles", Advanced Materials Research, Vol. 178, pp. 202-209, 2011