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CeCucontaining catalyst (CeCuMgAl(O)) was prepared by coprecipitation whose catalytic activity for NO+CO in the presence of oxygen was examined and compared with the catalyst free of cerium.The effect of H 2O on the catalytic activity was also investigated.The results show that for NO+CO reaction in the presence of oxygen,the activitytemperaturewindow of CeCuMgAl(O) shifts to lower temperature than that of CuMgAl(O).The presence of H 2O gives rise to the significant changes of catalytic activity of these two catalysts in low temperature region:great reducing for CuMgAl(O) and intensive increase for CuCeMgAl(O) whereas no obvious effect in high temperature region.The synergy between CuCe oxides and thus much more Cu+ exist in the CeCuMgAl(O) than CuMgAl(O) are responsible for these differences.
CeCucontaining catalyst (CeCuMgAl (O)) was prepared by coprecipitation whose catalytic activity for NO + CO in the presence of oxygen was examined and compared with the catalyst free of cerium. The effect of H 2O on the catalytic activity was also investigated.The results show that for NO + CO reaction in the presence of oxygen, the activitytemperaturewindow of CeCuMgAl (O) shifts to lower temperature than that of CuMgAl (O). The presence of H 2O gives rise to the significant changes of catalytic activity of these two catalysts in low temperature region: great reducing for CuMgAl (O) and intensive increase for CuCgMgAl (0) and intensive increase for CuCgMgAl (O) ) are responsible for these differences.