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Pt-Rh型三效催化剂中BaO的作用 被引量：10

Effect of BaO on Catalytic Activity of Pt-Rh TWC
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摘要 研究了以浸渍法制备的以BaO为助剂的Pt-Rh型三效催化剂对C3H8,CO,NOx的三效催化活性。主要考察了BaO不同的添加方式对催化剂三效转化活性的影响,并对催化剂样品进行了XRD,H2-TPR和O2-TPD表征。结果表明:BaO的添加方式的不同,直接影响催化剂的活性,特别是Ba与Ce,Zr以共沉淀的方式形成CeO2-ZrO2-BaO固溶体,可促进催化剂在低温时的水汽转换反应,显著降低了催化剂的起燃温度。 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 lightoff temperatures of hydrocarbon and carbon monoxide and nitrogen oxides have of little difference in the fresh catalysts. But after hydrothermal-aged 5 h at 1000℃, the catalysts containing CeO2-ZrO2-BaO has lower light-off temperature and better catalytic activity than the catalysts containing BaO and CeO2-ZrO2. The catalysts were characterized by means of temperature-programmed reduction （TPR） in the hydrogen and the temperature-progrmmed desorption （TPD） in oxygen. It is confirmed that the presence of CeO2-ZrO2-BaO by co-precipitation can improve catalytic activity of catalysts.
作者 郭家秀 龚茂初 袁书华 陈耀强
机构地区 四川大学化学学院
出处 《中国稀土学报》 CAS CSCD 北大核心 2006年第1期27-31,共5页 Journal of the Chinese Society of Rare Earths
基金 国家自然科学重点基金(20333030) 国家自然科学基金资助项目(20273043)
关键词 BAO Pt-Rh 三效催化剂 H2-TPR O2-TPD 稀土 BaO Pt-Rh three way catalysts H2-TPR O2-TPD rare earths
分类号 O643.3 [理学—物理化学]
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参考文献14

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共引文献14

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二级引证文献28

中国稀土学报
2006年 第1期

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