A series of Ceo.sZro.5O2 oxygen storage material samples were prepared by co-precipitation using ammonium carbonate as precipitant. The effect of the concentration of the salt solution on the performance of the target materials and its supported Pd-only catalyst was investigated. The samples were characterized by N2 adsorption, X-ray diffraction, oxygen storage capacity, and temperature-programmed reduction. The results showed that the prepared material exhibited high thermal stability and perfect redox properties. When the concentration of the salt solution was 0.3 mol/L, the obtained material presented the best textural properties with a surface area of 53.0 m2/g and pore volume of 0.17 cm3/g after calcination at 1000 °C for 5 h. The corresponding catalyst exhibited higher catalytic activity with relative low light-off and full conversion temperature, showing potential application in automotive catalysts.%以碳酸铵水溶液为沉淀剂,改变前驱体盐溶液的浓度,采用共沉淀法制得了一系列Ce0.5Zr0.5O2固溶体材料.以此系列材料为载体制备了负载型单Pd三效催化剂,并利用N2吸附-脱附、X射线衍射、储氧量测定和程序升温还原等技术对材料了进行表征.结果表明,所制Ce0.5Zr0.5O2材料具有优异的抗高温老化性能和氧化还原性能,且盐溶液的浓度对材料及其负载型Pd三效催化剂性能的影响较大.当盐溶液浓度为0.3 mol/L时,制备材料的织构性能最佳,经1000℃老化5h后其比表面积和孔体积分别为53.0 m2/g和0.17 cm3/g.所制得的三效催化剂对CO,NO和C3H8具有低的起燃温度和完全转化温度,表现出最佳的催化性能,具有良好的应用前景.
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