Effect of BaO on Catalytic Activity of Pt-Rh TWC

【Abstract】 The effects of BaO doping on the three-way catalytic activity of Pt-Rh catalyst and on water-gas shift were investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides of the fresh catalysts slightly differ from those of the aged catalysts, and the catalysts containing CeO₂-ZrO₂-BaO have lower light-off temperature and better catalytic activity than these containing BaO and CeO₂-ZrO₂ after hydrothermal aging for 5 h at 1000 ℃. The catalysts were characterized by means of the temperature-programmed reduction （TPR） in hydrogen and the temperature-programmed desorption （TPD） in oxygen. It is confirmed that the suggested route of CeO₂-ZrO₂-BaO by coprecipitation can improve the catalytic activity of catalysts.更多还原