等离子体协同纳米催化脱除NOx及实现PM低温燃烧的机理研究

项目名称： 等离子体协同纳米催化脱除NOx及实现PM低温燃烧的机理研究

项目编号： No.51206068

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 工程热物理与能源利用学科

项目作者： 王攀

作者单位： 江苏大学

项目金额： 25万元

中文摘要： 等离子体（NTP）协同催化技术具有同时脱除NOx和PM的技术优点，被认为是柴油机后处理领域最有潜力的技术之一。与传统催化剂相比，纳米催化剂（NC）具有较高的比表面积和催化活性，可强化与反应物接触，从而高效催化脱除NOx和PM排放。本课题通过NTP协同NC脱除NOx及实现PM低温燃烧的机理研究，分析NTP能量密度、NC活性成分和温度对脱除NOx的作用机理，探寻NTP对NC低温活性的影响机制；结合Chemkin软件对NTP处理NOx的中间过程数值模拟，探寻NOx在NC微反应区内的化学机理；定量描述PM粒径分布、组分变化以及微观结构的变化规律，分析NTP-NC系统对PM理化性能的影响因素，结合TGA分析方法，评价PM低温燃烧性能；建立NTP-NC系统作用NOx和PM的反应模型，揭示NTP-NC系统脱除NOx的催化机制及实现PM低温燃烧的作用机理，为同时控制NOx和PM排放的技术发展提供理论基础。

中文关键词： 等离子体；纳米催化剂；理化性能；起燃温度；低温燃烧

英文摘要： The simultaneous reduction of NOx and PM through non-thermal plasma （NTP）assisted catalyst is considered to be one of the most promising technologies in diesel exhaust after-treatment.Compared with conventional catalysts,nano-catalysts（NC） with high specific surface area can increase the contact area between reactants and the catalyst,in order to achieve high NOx and PM reduction.The mechanism research on NOx reduction and PM low-temperature combustion with non-thermal plasma assisted nano-catalytic technology were investigated,and the effect on NOx reduction with NTP energy density,the composition of the nano-catalyst and temperature were analyzed to explore the relation between NTP and low temperature active of catalyst.The chemical mechanism of NOx reaction in the micro-region of nano-catalyst was explored combined with the numerical simulation of NTP treatment by the Chemkin software.By using quantitative descriptive analysis method,the change laws of the particle size distribution,component changes and the microstructure of nano-catalyst were described.Combined with thermogravimetric analysis (TGA),the effects of NTP-NC system on the PM physical and chemical characteristics were analyzed to evaluate the performance of PM low temperature combustion.The reaction model of NOx and PM reduction by NTP-NC system

英文关键词： non-thermal plasma；nano-catalyst；physico-chemical properties；ignition combustion temperature；low temperature combustion