纳米铈基复合氧化物孔材料催化降解氯代有机污染物的性能及机理研究

项目名称： 纳米铈基复合氧化物孔材料催化降解氯代有机污染物的性能及机理研究

项目编号： No.21477109

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 化学工业

项目作者： 周仁贤

作者单位： 浙江大学

项目金额： 85万元

中文摘要： 含氯代有机污染物（CVOCs）的削减技术及控制原理研究是目前环境化学领域的研究热点之一。本研究拟针对目前降解CVOCs催化剂性能上的缺陷，设计合成出兼具形貌效应、孔结构效应及掺杂效应的纳米Ce基复合氧化物孔材料，通过对该材料表面组成、形貌、结构的调控，优化出低温高活性、稳定性好、降解产物安全的新型高效催化剂。综合利用多种分析技术，特别是原位动态表征技术，获取反应过程中的活性中心、电子转移、中间物种和反应过渡态等重要信息；探索合成条件与形貌、孔结构形成及高度暴露活性晶面之间的规律，系统研究催化性能与催化剂的组成、晶面、孔结构之间的依赖关系；从微观层次深入研究界面催化的反应机理。本课题的研究将为CVOCs污染物的控制技术提供一种新的方法和理论依据。

中文关键词： 挥发性有机物；催化燃烧；纳米材料；催化剂

英文摘要： The exhaust containing chlorinated organic volatile compounds (CVOC) presentspersistent environmental pollution. Catalytic elimination of organic chlorinatedhydrocarbons is most economical and reliable, because of the conversion at lowtemperature and high selectivity. In this proposal, solvent and water thermal synthesis,surfactant self-assembly will be used for preparing CeO2 nano-materials with differentmorphologies and lattice faces. The effect of nano-CeO2 mricrostructure on the abilityto adsorb and activate oxygen, adsorption strength of Cl species and hydrolysis will beinvestigated. Through the introduction of Ru and some transitional metal oxides, the Cebasematerials can be modified with several levers so as to create the combination ofseveral active sites for different reactions, realize the removal of Cl species from thecatalyst surface, and exchange Cl species with active oxygen. Therefore, a strong adsorption of Cl species produced during CVOC decomposition resulting in the deactivation whish is serious question can be overcome. At the same time, the activities for CVOC oxidation at low temperature and HCl oxidation will be promoted and the activity for chlorination of CVOC will be inhibited. As a result, the chlorination may not proceed over Ce-based catalysts even in the presence of a small amount of Cl2. CVOC can be converted into HCl, H2O, and CO2 with high selectivity. And the system for stable catalytic elimination of CVOC at low temperature is established. If the project in proposal is successful, new method and think for catalytic elimination of CVOC at low temperature is provided for our country. And this project can obtain patents completely.

英文关键词： Volatile organic compounds;Catalytic combustion;Nano-materials;Catalyst