中文摘要：

通过在台架上对HLA95IQ型电喷汽油机进行试验研究,采集和测定了三元催化器前后的多环芳香烃浓度,并对其生成规律进行了分析.结果表明,三元催化器前的排气温度在600～800℃时,随着温度的升高,燃油裂解出更多的自由基团,从而促使生成更多的多环芳香烃;而排气温度在200-600℃时,多环芳香烃则是源于未完全燃烧的燃油;在催化器中存在着多环芳香烃合成与分解的两个互逆过程,占主导地位的过程由多环芳香烃各自的性质和反应条件决定.

英文摘要：

The polycyclic aromatic hydrocarbon emissions before catalyst and after catalyst were sampled and meas-ured based on HL495IQ electrical fuel injection gasoline engine,and the formation mechanism was analyzed.The results show that more free radicals lead to more polycyclic aromatic hydrocarbons with the temperature going up when pre-catalyst exhaust gas temperature range is 600—800 ℃.Polycyclic aromatic hydrocarbons may be derived from incompletely burned gasoline when the exhaust gas temperature range is 200—600 ℃.There exist combination and transform processes of polycyclic aromatic hydrocarbons in the catalyst.The dominant process is determined by component concentration and the reaction condition.