中文摘要：

从Pd纳米粒子溶胶出发，采用一步沉淀法和浸渍法分别制备了0．5％（质量分数）Pd／Ce06Zr0.4-xYxO2（x=0，0．03，0．05，0．1）负载型三效催化剂，考察了贵金属纳米粒子的负载方法以及Y的掺杂量对三效催化活性和水热稳定性的影响。结果表明，和浸渍法制备的催化剂相比，采用一步沉淀法制备的催化剂具有更高的三效催化活性。对于一步沉淀法制备的催化剂，Y的掺杂量对新鲜样品的三效催化活性影响不大，然而，900℃水热老化后，Y的掺杂量为0．05的Pd／Ce06zr0.35Y00502催化剂表现出最佳的催化活性，且其三效窗口也最为稳定。以上研究结果表明，一步沉淀法是一种从贵金属纳米溶胶出发制备纳米三效催化剂的有效方法，且在铈锆储氧材料中掺杂适量的Y元素可以进一步提高催化剂的三效催化活性和水热稳定性。

英文摘要：

The 0.5% （mass fraction） Pd/Ce0.6Zr0.4_x YxO2（x =0, 0.03, 0.05, 0.1 ） three-way nanocata- lysts were prepared from colloidal palladium （Pd） nanoparticles by one step co-precipitation （COP） and impregnation （ IMP ） method, respectively. The effects of preparation method and doping amounts of yttrium （Y） on the three-way activities and hydrother- mal stability were investigated. The results showed that both fresh and aged COP catalysts had higher three-way catalytic activities than that of the corre- sponding IMP samples. For fresh COP catalysts, the doing of Y had little effect on the three-way catalytic activities. However, Pd/Ceo. s Zr0.35 Y0. o50z showed the best catalytic performance and wider air/fuel operation window after being hydrothermal aged at 900 ~C for 6 h. It can be concluded that one step co-precipitation method is a promising method for the fabrication of three-way nanocatalysts from colloidal Pd nanoparticles and an appropriate content of Y dopant seems to favor an enhancement in the three-way catalytic activities and hydrothermal stability of Pd/Ceo.sZro.4_xYxO2 cat- alysts.