柴油机具有较高燃油经济性和稳定性而被广泛使用。随着排放法规的升级，对后处理催化剂特别是DOC催化剂的低温活性，抗劣化性能以及NO氧化的窗口及转化率提出了新的要求。（1）当尾气温度低时，如何提高对HC、CO和NO氧化活性。（2）当面临着高温，高水汽和较高氧浓度时，如何保持催化剂的稳定性。（3）特别是在低温高空速的情况下，如何提高NO氧化成NO2的能力，以上三个问题制约着该催化剂的应用。本项目拟采用前驱体络合和吸附剂的诱导占位来提高贵金属的分散状态，解决催化剂的低温活性；结合过程处理的控制和助剂添加，协同调控催化剂活性中心的化学状态和表面氧空缺，利用形成Pt-O-M键提高催化剂的稳定性能。通过反应揭示柴油机尾气中HC、CO及NO的协同氧化与催化剂的组成-结构-化学状态-性能之间的关系。在此基础上，寻找DOC催化剂精细制备与催化活性和稳定性相互关联的内在规律，为指导和设计高活性高稳定性的铂基催化

Diesel engines are widely used due to its high fuel economy and stability. With the more rigorous emission regulations, new requirements for after-treatment catalysts have been put forward, especially on the low-temperature activity of DOC catalysts, the degradation resistance as well as the temperature window and conversion rate of NO oxidation. (1) How to improve the oxidation activity of HC, CO and NO at the low-exhaust gas temperature. (2) How to maintain the stability under the condition that high temperature, high water vapor and high oxygen concentration. (3) How to improve the oxidation ability of NO to NO2 especially at low temperature and high space velocity. The above three problems restrict its application. The project intends to use the precursor complexation and the induced occupancy of the adsorbent to increase the dispersion of the precious metal, aimed at solving the low temperature catalytic activity. Combing with the control in treatment process and the promoter addition, the chemical state of the active center and surface oxygen vacancies on the catalyst are coordinated. Though formation of Pt-O-M bond could increase the thermal-stability of the catalyst. These reactions could reveal the relationship between the coordinated oxidation of HC, CO and NO in the diesel exhaust and the composition structure-chemical state-catalytic performance on the catalyst. Based on these, it could investigate the intrinsic connection on DOC catalysts between the fine preparation, the catalytic activity and stability. It would provide the theoretical and experimental basis for guiding and designing platinum-based catalysts with high catalytic activity and high-stability.