Manganese substituted ferric perovskite-type catalysts were prepared by co-precipitation method.The title catalysts were calcined at 700 ℃ and characterized by XRD,TPR and TG-DSC techniques.The catalytic activity was evaluated using methane combustion as a model reaction.The specific surface area was calculated by BET model.The values of the apparent activation energy were estimated from the Arrhenius plots based on a CH4first-order rate equation.The samples exhibit significant catalytic activity for methane combustion at 700 ℃.With increasing the substitution of Mn2+,the activities of the catalysts are improved.Upon calcination at 700 ℃ the catalyst SrMnO3 shows an excellent activity for methane combustion (the conversion of 10％ and 90％ are obtained at 435 ℃ and 457 ℃,respectively).%通过共沉淀法制备了SrFe1-xMnxO3钙钛矿催化剂.用XRD 、TPR和TG-DSC技术对催化剂进行了物理性能表征,以甲烷催化燃烧为目标反应表征其催化性能,通过BET模型计算了其比表面积,通过阿伦尼乌斯方程计算了反应的表观活化能.结果表明用共沉淀法制备钙钛矿催化剂经700 ℃焙烧4h后可以形成完整的钙钛矿晶型,样品都具有高的催化性能,但随着锰离子的掺杂,催化剂活性明显提高,其中SrMnO3催化剂具有较高甲烷催化燃烧活性,起燃温度T10％为435℃,至457℃甲烷完全转化.
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