Abstract: A series of MP-like catalysts LaAAl₁₁O₁₉ and LaAMnAl₁₀O₁₉ (A stands of Cd,Zn,Zr) were prepared by co-precipitation method. The structure and the properties of these catalysts were investigated by using BET,XRD techniques and activities of methane catalytic combustion. The influence of different transition metal on the morphological and catalytic activity of the catalysts was studied. The results show that the catalyst with good crystal is obtained after calcination at 1 200 ℃. And all catalysts have the high catalytic activity and stability. The introduction of different transition metal has much effect on the properties of catalysts. The synergism is observed between the different metal ion. Catalytic activity is enhanced by synergism. LaZnMnAl₁₀O₁₉  has the higher catalytic activity in methane combustion and its light-off T 10% is 472 ℃, total conversion  T 90% is 734 ℃.

Key words: Methane   , Catalytic combustion    , Mannetoplumbite   ,  Activity

摘要： 用共沉淀法制备Cd,Zn,Zr和Mn共同搀杂作为活性组分的一系列磁铅石型镧六铝酸盐催化剂,通
过BET,XRD分析及甲烷燃烧,对催化剂的结构和性质进行了考察。研究了搀杂不同过渡金属的催化剂的结构以及
对甲烷催化燃烧活性的影响。结果表明,催化剂在1200℃焙烧后可以形成完整的六铝酸盐晶型,同时具有较高的
催化性能和高温稳定性,两种不同的金属离子同时取代对于催化剂的活性有较大的影响,进一步说明了不同离子之
间存在着一定的协同作用。由于协同效应的存在使催化剂的活性得到明显提高,其中以LaZnMnAl10O19催化剂的
活性最好,其起燃温度T10% 为472℃,完全转化温度T90% 为734℃。

关键词: 甲烷  ,  , 催化燃烧 ,   磁铅石  ,   活性