关键词: 正交实验  ,   , 催化燃烧   ,   , 金属氧化物  ,   , 水热合成

Abstract: 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(NO₃)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.

Key words: