Abstract: Chemical reduction reaction between potassium permanganate and manganese nitrate was employed to directly generate MnCo₂O₄ spinel on a monolith coated with alumina, and two kinds of Pt-Pd/MnCo₂O₄ composite combustion catalysts, named MnCo-2 and MnCo-3, were prepared. MnCo-2 had approximately 44% less noble metal content than the foreign reference sample, and about 16% less than the domestic reference sample. Its activity in the oxidation of low carbon hydrocarbons such as ethane was comparable to that of the foreign reference sample. The oxidation conversion temperature T99 for ethane, T99 for propane, and T90 for methane were 440, 380 and 460 ℃, respectively, which were approximately 60 ℃ lower than that of the domestic reference sample, and the performance was stable in the cumulative 800 h test. MnCo-3 had approximately 61% less noble metal content than the foreign reference sample and about 41% less than the domestic reference sample. Its total reagent cost was approximately 38% lower than that of the domestic reference sample, and the ethane T99 conversion temperature was 475 ℃, which was 25 ℃ lower than that of the domestic reference sample.

Key words: low carbon hydrocarbons, catalytic combustion, noble metals, non-noble metal oxides, composite catalyst