Effect of BaO on Catalytic Activity of Pt-Rh TWC
来源期刊：JOURNAL OF RARE EARTHS2006年第5期
论文作者：Guo Jiaxiu Gong Maochu Chen Yaoqiang Yuan Shuhua
Key words：BaO; Pt-Rh; three-way catalysts; H2-TPR; O2-TPD; rare earths;
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 lightoff temperature and better catalytic activity than these containing BaO and CeO2-ZrO2 after hydrothermal aging for 5 h at 1000 C. 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.
Guo Jiaxiu1，Gong Maochu1，Chen Yaoqiang1，Yuan Shuhua1
(1.College of Chemistry, Sichuan University, Chengdu 610064, China)
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 lightoff temperature and better catalytic activity than these containing BaO and CeO2-ZrO2 after hydrothermal aging for 5 h at 1000 C. 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.
Key words:BaO; Pt-Rh; three-way catalysts; H2-TPR; O2-TPD; rare earths;
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