CuAgLa多组分钛硅分子筛／堇青石整体式催化剂降低稀燃发动机NOx排放的试验研究  

Study on NO_x Emissions Reduction by Using CuAgLa-TS-1/Cordierite Monolithic Catalysts in a Lean-Burn Gasoline Engine

作　　者：张群[1] 王天友[1] 刘书亮[1] 赵华[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室

出　　处：《燃烧科学与技术》2008年第3期265-268,共4页Journal of Combustion Science and Technology

基　　金：国家高技术研究发展计划(863)资助项目(2006AA11A198)

摘　　要：采用原位合成技术制作了多组分CuAgLa-TS-1/堇青石整体式催化剂,通过选择还原法降低稀燃汽油机NOx的排放.试验结果表明,不需额外添加还原物质,而采用稀燃发动机自己排放的HC和CO等作为还原物质可以对NOx排放进行选择还原.在排气温度为450℃左右、空速为28 500 h-1时,多组分分子筛催化剂的最大NOx转化效率为33.3%,较Cu-TS-1分子筛催化剂有所降低,但其维持较高的NOx转化率排温窗口较为宽广,区间可达80℃.经H2预还原后,多组分CuAgLa-TS-1稀燃催化剂对NOx的转化效率较未还原的催化剂的活性稍有提高,但耐久性变差.In this research, copper, silver and lanthanum TS-1/cordierite was prepared as catalysts for selective catalytic reduction（SCR） of nitrogen oxides（NOx） in a lean-burn gasoline engine by ion-exchange and impregnation methods were studied. The engine test results show that NOx emission was reduced by HC and CO in the exhaust gas without any other extra reductants. Using CuAgLa-TS-1/cordierite, the maximum efficiency of NOx conversion to N2 reached 33.3% at the exhaust temperature of 450 ℃ and the gas hourly space velocity （GHTV） of 28 500 h^-1, which was less than that of Cu-TS- 1/cordierite. But the operation temperature window of catalysts was widened to 80 ℃. Meanwhile, CuAgLa-TS-1/cordierite which was swept by the reducing gas H2 could obtain slightly higher catalytic activities. However, it showed bad duration and anti-poison properties.

关 键 词：钛硅分子筛/堇青石催化剂 稀燃发动机 NOx 排放 

分 类 号：TK411.25[动力工程及工程热物理—动力机械及工程]