CeO_2-ZrO_2-Y_2O_3对Pt-Rh型三效催化剂性能的影响  

Influence of Ce_(0.35)Zr_(0.55)Y_(0.10)Solid Solution on Performance of Pt-Rh Three-Way Catalysts

作　　者：郭家秀[1] 袁书华[1] 龚茂初[1] 沈美[1] 钟俊波[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,四川成都610064

出　　处：《中国稀土学报》2006年第2期174-178,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(20273043)资助项目

摘　　要：采用共沉淀法技术制备了Ce0.35Zr0.55Y0.10固溶体,并对其进行了比表面积、储氧量的测试和XRD的表征。将其用于低贵金属Pt-Rh型三效催化剂的制备,考察了CeO2-ZrO2-Y2O3对三效催化剂性能的影响。结果表明,Ce0.35Zr0.55Y0.10具有与Ce0.50Zr0.50O2相似的立方结构和相近的储氧量,经高温(1000℃)后仍能保持较大的比表面积(38.66m2·g-1)。和含Ce0.50Zr0.50O2的三效催化剂相比,含CeO2-ZrO2-Y2O3的三效催化剂经高温老化后,C3H8,CO,NO仍具有较高的转化率和较低的起燃温度。Ce0.35Zr0.55Y0.10 solid solution was prepared by co-precipitation technique and characterized by specific surface area measurements and X-ray diffraction （XRD）. Ce0.35Zr0.55Y0.10 was used to prepare low Pt-Rh three-way catalyst （TWC） and its influence on the performance of TWC was investigated. The results show that Ce0.35Zr0.55Y0.10 has a cubic structure similar to Ce0.50Zr0.50O2 and its specific surface area can maintain higher than Ce0.50Zr0.50O2 after high temperature calcinations. After aging at 1000℃, the catalyst containing Ce0.35Zr0.55Y0.10 still shows higher conversion of C3H8, CO and NO and lower light-off temperature in comparison with Ce0.50Zr0.50O2 TWC.

关 键 词：低贵金属 三效催化剂 稀土 

分 类 号：O643.3[理学—物理化学]