乙醇汽油和普通汽油对发动机催化器性能的影响

Investigation of three-way catalyst performance using ethanol-gasoline and normal gasoline

通过测量发动机在燃用乙醇汽油和普通汽油时催化器前后的排放和转化效率,对比研究两种燃料对催化器性能的影响。实验使用5种市售乙醇汽油和6种普通汽油,在催化器前端和后端测量CO、HC、NOx排放。研究发现,市售乙醇汽油的CO排放高于普通汽油,HC排放与普通汽油基本相同,NOx排放低于普通汽油。在怠速工况,燃用乙醇汽油时催化器对CO和HC的转化率高于普通汽油,对NOx的转化率稍低于普通汽油。中等转速时,乙醇汽油的CO转化率在中等负荷时较低,其他工况高于普通汽油,HC、NOx的转化率基本相同。

After measuring the engine＇s emission and the catalyst convertsion rate, the influence on the catalyst were studied by using ethanol-gasoline and normal gasoline. In the experiments, 5 kinds of ethanol-gasoline and 6 kinds of normal gasoline on the market were used, and the CO, HC, and NO, emission were measured before and after the catalyst. The results showed that eth- anol gasoline＇s CO emission was higher than normal gasoline＇ s, HC emission was equal to normal gasoline＇ s, and NOx emission was lower than that of normal gasoline. When using ethanol-gasoline, the conversion rate for CO and HC was higher than using normal gasoline in idling mode, while the conversion rate for NO x was a little lower. For the medium speed of engine, the convertsion rate for CO was lower with medium loads, and higher with other load. The conversion rate for HC and NOx was equal to normal gasoline under most of the conditions.