To reduce the effect of cordierite carrier on the activity and thermal stability of perovskites,LaMnO3 monolithic catalysts with La2O3 and SiO2 coating were prepared by in-situ deposition and slurry impregnation. The activity and thermal stability of the catalysts were investigated in catalytic combustion of toluene. It was shown that La and Mn oxides could be deposited uniformly and firmly on the surface of cordierite, but the active phases of LaMnO3 perovskites could not be formed by in-situ deposition.However the progress of slurry impregnation could maintain the structure and activity of LaMnO3 catalyst. The monolithic LaMnO3 showed the same catalytic performance as the pure LaMnO3 powder catalyst. La2O3 coating was more effective than SiO2 coating to keep high thermal stability and activity of LaMnO3 on the surface of cordierite.
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