Abstract:

Ce-Cu-containing 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 activity-temperature-window 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.

Key words: Synergy, DeNOx activity, H2O poisoning, Adsoption site