The Study on Catalytic Combustion Properties of Methane over Double Perovskite Catalysts

The Study on Catalytic Combustion Properties of Methane over Double Perovskite Catalysts
　　A series of double perovskite catalysts Sr2B’B"O6(B’=Fe、Co、Ni、Mn、Cr, B"=Mo、W) were prepared by sol-gel method with citric acid as complex agent. Theproperities and structure of catalysts were characterized by XRD, TPR, BET, XPS,Electrical conductivity Test. Catalytic activities in methane catalytic combustion ofcatalysts were investigated.The rare earth magnets results showed that main-phase double perovskites could be preparedefficiently by sol-gel method at the temperature 1100℃in H25%/N295%mixedatmosphere concluding single-phase double perovskites Sr2FeMoO6、Sr2MnMoO6、Sr2FeWO6、Sr2CoWO6、Sr2NiWO6. La and Ce doped double perovskites oxides Sr2-xLaxMnMoO6 (x=0.02、0.04、0.06、0.08、0.10)and Sr2-xCexMnMoO6(x=0.02、0.04、0.06、0.08、0.10)wereprepared by the same method. It indicated that an optimal quantity of La dopingdouble perovskite oxide catalysts Sr2MnMoO6 can improve its http://www.chinamagnets.biz/ catalytic activitysignificantly and Ce doping double perovskite oxide catalysts Sr2MnMoO6 wasdisadvantage for its activity. When X≤0.08, it is advantage for forming single-phasedouble perovskite Sr2-xLaxMnMoO6, and when X≤0.06 it is good for formingsingle-phase double perovskite Sr2-xCexMnMoO6.