A series of MP-like catalysts LaAAl ₁₁O ₁₉ and LaAMnAl ₁₀O ₁₉ (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. LaZnMnAl ₁₀O ₁₉  has the higher catalytic activity in methane combustion and its light-off T 10% is 472 ℃, total conversion  T 90% is 734 ℃.

The hydrothermal synthesizing condition of catalysts for low-temperature methane catalytic combustion was investigated and analyzed through the orthogonal experiment. The results show that the activity of catalyst is influenced mostly by the activity components in the initial phase of combustion, in the middle and final phase all the factors influence the activity of catalyst mostly. The proper hydrothermal synthesizing condition was that using Co(NO ₃) ₂ as reactant, carbamide was 4.5 times than what was needed, the reaction maintains 4 h at 160 ℃. Then dried 15 h at 120 ℃ and roasted 3 h at 500 ℃. The No.15 sample of orthogonal experiment acquired the best activity and the T 99%  was 549 ℃. The activity of the additional sample synthesized at the optimized condition improves largely and the T99%  was 447 ℃ .X-ray diffraction(XRD) and BET reveal the catalysts maintain the same crystal structure at a temperature range from 500 ℃ to 800 ℃, the particle size increases and the surface area is decreased with the increasing of calcination temperature, as a result the activity of catalyst is decreased.