Preparation And Propertis Characterization Of Double Perovskite Oxide Sr₂FeMoO₆ Catalysts

The double perovskite oxide Sr₂FeMoO₆ catalysts were prepared by sol-gel method using glucose as complex agent. The structures of catalysts were characterized by XRD, TPR, TEM, TG-DTA, BET, FT-IR, Electrical Conductivity Test and Magnetism Techniques. Catalytic activities in methane catalytic combustion of catalysts were investigated. In the same time, we associated the physical and chemical properties of Sr₂FeMoO₆ catalysts preliminary.The results showed that the double perovskite oxides Sr₂FeMoO₆ forms single-phase at the temperature of range from 900°C to 1100°C, and H₂/N₂ mixing gas atmosphere was most effective for synthesis single-phase than air and Ar atmosphere.In addition, we also studied the effects of reflux conditions on structure and catalytic peroperties of Sr₂FeMoO₆ catalysts .We can see that the catalytic activities in methane catalytic combustion enhanced and the particle size is decreased.La doped double perovskite oxides catalyst Sr_1.9La_0.1FeMoO₆ shown better catalytic activity for methane combustion reaction than bulk catalyst, which T₁₀(methane conversion of 10%) and T₉₀(methane conversion of 90%) were 460 °C and 600 °C respectively. It is indicate that an optimal quantity of La was doping double perovskite oxides catalyst Sr₂FeMoO₆ can improve its catalytic activity significantly. The catalytic activity of supported catalysts Sr_1.9Ce_0.1FeMoO₆ was better than bulk catalyst, however, the catalyst Sr₂FeMoO₆ supported by Ba showed lower catalytic activity of methane.