高性能碳烟燃烧复合氧化物催化剂的设计与制备

项目名称： 高性能碳烟燃烧复合氧化物催化剂的设计与制备

项目编号： No.21207037

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 王丽

作者单位： 华东理工大学

项目金额： 25万元

中文摘要： 柴油车具有优异燃油经济性和动力性能，其尾气排放控制技术以NOx和碳烟净化为主要特征，其中颗粒物捕集器(DPF)被广泛用于碳烟的去除。将DPF与催化燃烧相结合有望使碳烟燃烧温度降低到排气温度范围内，可实现DPF原位再生，高性能碳烟燃烧催化剂的开发是目前所需解决的关键。课题以CeO2和Co3O4为基础，从提高催化剂吸附活化氧的能力入手，通过引入其它金属氧化物，研究表面活性氧物种的形成、存在形式、传递与释放等对碳烟燃烧性能的影响规律。考察尾气中各组分对碳烟燃烧性能的影响，建立复杂体系下的动力学反应网络，确定碳烟催化燃烧的反应机理。同时在组成设计上引入NOx氧化-吸附存储-快速分解，及通过强化蒸汽重整/水汽变换加速表面硫酸盐分解和还原的理念，提高碳烟催化燃烧的活性和抗硫稳定性。通过本课题的研究，建立催化剂的组成-结构-表/界面性质-碳烟燃烧性能之间的构效关系，为制备高性能碳烟燃烧催化剂提供基础。

中文关键词： 碳烟；催化燃烧；氧活化；掺杂；催化剂

英文摘要： The diesel vehicle has been widely used due to its efficient fuel economy and high power performance, the removal of NOx and soot particle is still the major challenge for the after treatment technology of diesel exhaust. The diesel particulate filter (DPF) is widely developed to remove soot particle now. The combination of DPF and catalytic combustion of soot is expected to lower the temperature of soot combustion, which can promote the in situ regeneration of DPF in the exhaust temperature range. So it is very important to develop the catalyst with the high performance for soot combustion. The idea of this work is to increase the catalysts activity for soot combustion through the acceleration of oxygen activation on the surface. The effects of the doped metal oxides on the abilities of CeO2 and Co3O4 for the adsorption and activation of oxygen, the formation and the amount of the active oxygen species, the transfer and release of active oxygen species would be investigated. The effects of different exhaust components on soot combustion would be studied in detail to establish the network of reaction kinetics. The concepts of NOx oxidation, adsorption-storage, and quick decomposition will be adopted to improve the performance of soot combustion under loose contact condition. At the same time, the increase of SO2

英文关键词： soot；ctalytic combustion；oxygen activation；doping；catalyst