作　　者： ; ; ; ;

机构地区： 上海工程技术大学汽车工程学院

出　　处： 《现代化工》 2013年第9期81-85,共5页

摘　　要： 利用浸渍法制备Cu&Fe基分子筛催化剂来催化还原柴油机尾气中的NOx,反应在SCR系统中进行。试验研究了该催化剂在中低温下的催化活性以及不同N SR对柴油机NOx转化效率的影响,并探究温度、空速对此分子筛催化剂的储氨特性的影响,分析了氨存储量与NOx转化效率的关系。试验结果表明:该催化剂在300～400℃的催化活性在90%以上,适当提高氨氮比NSR可以提高NOx转化效率;温度对储氨特性的影响大于空速,在200～250℃时,NOx转化效率与氨存储量呈线性关系,在大于350℃时,氨存储量对NOx转化效率的影响较小。经试验验证该Cu&Fe基分子筛催化剂在后处理系统达到了国Ⅴ排放标准。 The Cu＆Fe Molecular Sieve Catalyst prepared by impregnation method is used for catalytic reduction of NOx in diesel exhaust,which reacts in the SCR system.The catalytic activity of Cu＆Fe molecular sieve catalyst in low temperature,the influence of NSR on NOx conversion efficiency,and the effects of temperature and airspeed on the ammonia storage characteristics of this molecular sieve catalyst,are investigated.The relationship between the ammonia storage and the NOx conversion efficiency is explored.The results show that The catalytic activity can be more than 90％when the catalyst is at 300-400℃.An appropriate increase in NSR can improve the NOx conversion efficiency.Temperature has greater effect on the characteristics of the ammonia storage than the airspeed.At 200-250℃,the linear relationship between the NOx conversion efficiency and the amount of ammonia storage can be found.However,the ammonia storage has little influence on NOx conversion efficiency when the temperature is higher than 350℃.This Cu＆Fe molecular sieve catalyst meets China-V emission regulations.

关 键 词： 基分子筛催化剂 选择性催化还原 转化效率 氨存储

领　　域： [机械工程] [交通运输工程] [交通运输工程]