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The effect of BaO doping to the Pt-Rh catalysts on its three-way catalytic activity and water-gas transfer was investigated. The results show that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides have little difference in the fresh catalysts. But after the hydrothermal-aged 5 h at 1000 ℃, the catalysts containing CeO_2-ZrO_2-BaO has lower light-off temperature and better catalytic activity than the catalysts containing BaO and CeO_2-ZrO_2. The catalysts were characterized by means of the temperature-programmed reduction (TPR) in the hydrogen and the temperature-programmed desorption (TPD) in the oxygen. It is confirmed that the presence of CeO_2-ZrO_2-BaO by co-precipitation can improve catalytic activity of catalysts.
The effect of BaO doping to the Pt-Rh catalysts on its three-way catalytic activity and water-gas transfer was investigated. The results show that the light-off temperatures of hydrocarbons and carbon monoxide and nitrogen oxides with little difference in the fresh catalysts The catalysts were characterized by means of the temperature, but the hydrothermal-aged 5 h at 1000 ° C, the catalysts containing CeO_2-ZrO_2-BaO with lower light-off temperature and better catalytic activity than the catalysts containing BaO and CeO_2-ZrO_2. -programmed reduction (TPR) in the hydrogen and the temperature-programmed desorption (TPD) in the oxygen. It is confirmed that the presence of CeO_2-ZrO_2-BaO by co-precipitation can improve catalytic activity of catalysts.