摘要
综述柴油发动机尾气后处理技术的主要发展。实验表明,在SCR前加DOC后,NOx在低温下的转化率明显提高,沸石催化剂性能好于钒基催化剂;LNT中采用碱土金属(如钡)或碱金属(如钾)作为吸附剂来提高储藏NOx的能力,采用贵金属不均匀分布法可降低成本;在LNC中小量的H2(<2%),就能在很宽的温度范围显著地提高银基LNC的NOx的转化率。分析了DPF载体新材料(基于钛酸铝的化合物等)的特点,总结了DPF再生及灰烬处理技术。
The paper summarizes the key developments of diesel engine aftertreatment technologies.Experiments demon-strate,a DOC unit was installed upstream of the SCR catalyst,which improved the low-temperature NOx conversion rate,zeolite type catalyst is better then vanadium type catalyst,alkaline-earth materials（barium） and alkali metals（potassium） can improve the NOx storage in LNT,PGM zoning can be used to lower the cost of a LNT,small amounts of hydrogen（2%） can markedly increase silver-based LNC reduction efficiency over much of the temperature range.This paper also analyzes the characteristics of new materials（aluminum titanate based composition,etc.） for DPF substrate,and summarizes the technolo-gies for DPF regeneration and ASH management.
出处
《内燃机》
2010年第4期1-4,共4页
Internal Combustion Engines
关键词
柴油发动机
后处理技术
催化剂
新材料
diesel engine
aftertreatment technologies
catalyst
new materials
