作　　者： ; ; ; ;

机构地区： 上海工程技术大学汽车工程学院

出　　处： 《上海工程技术大学学报》 2013年第3期197-201,共5页

摘　　要： 采用钒基与Fe-Cu分子筛催化剂的两种选择性催化还原(SCR)催化器来降低柴油机排气中的氮氧化物(NOx)浓度(体积分数φ),在发动机台架系统上进行试验,对比研究催化剂温度、空速、氨储存特性以及异氰酸(HNCO)的水解特性等因素对NOx转化效率的影响.结果表明,Fe-Cu分子筛催化剂温度窗口比钒基催化剂要宽,低温催化效率好.排气温度为250℃时,催化效率可达80%;排气温度为200℃时,空速对钒基催化剂的影响比分子筛的要大;排气温度为350℃以下,两种催化剂基本不受空速的影响.Fe-Cu分子筛催化剂的储氨能力在293℃和378℃时都比钒基强;钒基催化剂在低温下对异氰酸的催化水解效果比分子筛的更佳,在中高温下两者效果都很好. Two different SCR catalytic converters using V-based catalyst and Fe-Cu zeolite catalyst respectively were applied to decrease NOx from diesel engine exhaust. The experiment was carried out on the engine test bench,and the factors of affecting the catalytic efficiency, such as temperature, space velocity,NH3 storage and HNCO hydrolysis characteristics,were studied and analyzed. The results show that Fe-Cu zeolite catalyst has a wider temperature window than V-based catalyst,the conversion efficiency is better at lower temperature range, which can reach 80% at 250 ~C. The space velocity has a greater effect on V-based catalyst than Fe-Cu zeolite at 200 ℃ ,but both will not be affected by the space velocity at 350 ℃. The Fe-Cuzeolite catalyst can store more NH3 than V-based catalyst at 293 ℃ or 378 ℃. The catalytic hydrolysis effect of HNCO by V-based catalyst is better than Fe-Cu zeolite catalyst at low temperature,but both are the same at medium-high temperature.

关 键 词： 钒基催化剂 分子筛催化剂 排放 系统

领　　域： [动力工程及工程热物理]