氧化铈具有优异的储氧功能，常用作金属纳米颗粒的载体材料。为减少贵金属用量并提高其活性，双金属纳米催化(特别是非贵金属为核、贵金属为壳的双金属核壳结构纳米催化剂)已成为研究的热点。但活性双金属纳米颗粒和载体之间的接触界面较小，而催化反应的最高活性位点通常位于活性组分和载体的接触界面；同时活性双金属纳米颗粒在高温下容易聚集长大而导致其催化活性降低。本项目根据活性双金属纳米颗粒负载在氧化物载体上的上述两点不足，拟以多孔稀土氧化物为壳层，具有特定形貌和尺寸的双金属纳米颗粒为核，设计制备具有优异催化功能的“活性双金属@多孔稀土核壳结构新材料”，应用于汽车尾气中CO的催化氧化。考察壳层厚度和孔结构对催化反应性能的影响，并研究多孔稀土壳层对活性双金属纳米颗粒的限域作用及其和活性双金属纳米颗粒间的协同催化性能。

Due to its superior oxygen storage property, cerium oxide has been usually used as a support for nano metal particles. To reduce the amount of used noble metals and improve their catalytic activity, bimetal nano-catalysis, especially catalysts with non-noble metal cores and with noble metal shells, has become a hot research topic. Generally, the most active sites lie in the interface between the nano metal particles and the supports, but which is relatively small. In addition, it is easy for the nano metal particles to aggregate at high temperature, which degrades the activity of the catalysts eventually. To solve these two problems, it is proposed in this project to design and prepare novel “active bimetal @ porous rare earth core-shell structured materials”, for which the cores (bimetal nanoparticles) are with special morphologies and sizes, for CO oxidation in vehicle exhaust. The effects of shell thickness and pore structures on the catalytic performance, the confinement effects of porous rare earth shells on the bimetallic nanoparticles and the synergetic effect between them will also be investigated.