铈基催化剂/ZSM-5膜双层多效催化剂协同净化HCN、N2O和NH3研究

项目名称： 铈基催化剂/ZSM-5膜双层多效催化剂协同净化HCN、N2O和NH3研究

项目编号： No.21307047

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 环境科学、安全科学

项目作者： 张秋林

作者单位： 昆明理工大学

项目金额： 25万元

中文摘要： 高浓度CxHy、CO、NOx和PM一直是汽车尾气中倍受关注的污染物，而汽车尾气中HCN、N2O和NH3却未引起足够重视。本课题在堇青石上构建铈基催化剂(底层)/金属离子改性ZSM-5膜（上层）双层多效催化剂，并考察催化剂的制备条件及影响因素。通过在上层ZSM-5膜上先实现HCN催化水解和N2O催化分解反应的耦合，然后HCN水解产物（NH3和CO）和NH3在底层铈基催化剂层被高效催化氧化，从而实现HCN、N2O和NH3的协同净化。本研究在明晰HCN催化水解、N2O催化分解和NH3及CO催化氧化反应机理的基础上，进一步揭示双层催化剂协同净化HCN、N2O和NH3的催化原理和各反应间的相互作用机制，阐明双层催化剂的物化性质与协同反应的内在联系规律，并解析协同反应的机理。本研究旨在揭示双层催化剂协同净化HCN、N2O和NH3过程中的若干关键机理问题，将为HCN、N2O和NH3协同净化建立技术基础。

中文关键词： 催化剂；制备工艺；微观结构；表面物种；反应途径

英文摘要： Nowadays, the pollutants with high concentration of CxHy, CO , NOx and PM in automobile exhaust have attracted much attention. However, the pollutants of HCN, N2O and NH3 are almost neglected. This study prepares a multi-way dual layer catalyst of cerium-based catalyst (lower layer)/metal ion modified ZSM-5 membrane (upper layer) over cordierite, then the preparation conditions and influencing factors are investigated. This dual layer catalyst consists of an upper layer of ZSM-5 membrane and a lower layer of cerium-based catalyst. The HCN catalytic hydrolysis coupling of N2O catalytic decomposition are first carried out on the upper layer catalyst, then the catalytic oxidation of CO and NH3 are proceeded over the lower layer catalyst. This study will investigate the mechanism of HCN catalytic hydrolysis, N2O catalytic decomposition as well as catalytic oxidation of NH3 and CO, respectively. Then we will study the catalytic principle and the interaction mechanism of synergistic purification of HCN, N2O and NH3, furthermore, the reaction mechanism and the co-relationship between physicochemical properties of dual layer catalyst and synergistic reaction are also investigated. This study aims to reveal some key mechanisms of the process of synergistic purification, and the results can provide enough technical suppor

英文关键词： Catalyst；Preparation technology；Microstructure；Surface species；Reaction pathway