Abstract:

The catalytic combustion of (φ=3.6%) benzene during 200~500℃was investigated on supported Cu-Mn-O/Ce/Al₂O₃ -TiO₂catalysts prepared via different wet impregnation methods and characterized by X-ray diffraction (XRD)、N₂ adsoption at liqiud-nitrogen temperature (BET)、H₂ temperature programmed reduction (H₂-TPR) and X-ray photoelectron sprectroscopy (XPS) techniques. The results showed that the 15%CuMn₂O_x/Al₂O₃-TiO₂(ω(CuMn₂O_x)=15%) achieving 79% conversion of benzene at 300℃ presented higher activity than Cu/Al₂O₃-TiO₂ and Mn/Al₂O₃-TiO₂ catalysts. However, the 15%CuMn₂O_x-15%CeO₂/Al₂O₃-TiO₂ catalyst obtained by co-impregnation method attaining 81% conversion of benzene at 300℃ showed much higher catalytic activity than the catalyst prepared by two step impregnation. The adding of CeO₂ in the co-impregnation method can enhance the dispersion and interaction of compounts.

Key words: copper and manganese oxides,ceria,benzene,catalytic combustion