关键词:

双层钙钛矿型催化剂, 甲烷催化燃烧, 葡萄糖, 磁性, 溶胶-凝胶法

Abstract:

The double perovskite catalyst Sr₂FeMoO₆ was prepared by the sol-gel method using glucose as complex agent, at 1100℃ for 3 h.The structure and performance of the catalyst prepared in various calcination atmospheres (H₂/N₂ mixed gas, argon, and air atmospheres) were investigated.The catalyst was characterized by means of X-ray diffraction (XRD), temperature programmed reduction (TPR), Fourier transform infrared spectroscopy (FT-IR)，specific surface area and magnetism techniques.Meanwhile the catalytic activity of double perovskite Sr₂FeMoO₆ in methane catalytic combustion was investigated.The XRD results indicated that single-phase double Sr₂FeMoO₆ was found in the catalyst, calcined in H₂/N₂ mixed gas.Double perovskite was the dominant phase, accompanied by a few scheelite-type SrMoO₄ in the catalyst calcined in argon atmosphere，whereas besides double perovskite phase a stronger SrMoO₄ phase was found in the catalyst calcined in air atmosphere.FT-IR and TPR results indicated that TPR spectrum and infrared spectroscopy of catalyst calcined in different atmospheres were different.The catalyst calcined in H₂/N₂ mixed gas had better magnetic property, whereas the catalyst calcined in argon and air atmospheres had little magnetism.The T₁₀(temperature for 10% methane conversion) and T₁₀₀(temperature for 100% methane conversion) of single-phase Sr₂FeMoO₆ double peroskite were 475℃and 744℃ respectively.So single-phase double perovskite Sr₂FeMoO₆ had good catalytic activity for methane catalytic combustion.

Key words:

双层钙钛矿型催化剂, 甲烷催化燃烧, 葡萄糖, 磁性, 溶胶-凝胶法