汽油的烯烃对发动机排放的影响

讨论了汽油中的烯烃与发动机排放之间的关系。研究表明，当烯烃含量增加时，发动机排放的ＮＯｘ和１，３－丁二烯增加，ＨＣ、挥发性有机化合物和甲醛减少，乙醛和苯的排放量不变；虽然烯烃含量增加，使发动机尾气臭氧形成的比活性提高，但对臭氧形成的能力影响不大。烯烃是一种辛烷值资源，应该加以利用，并且烯烃对发动机沉积物的负面影响可以通过加入汽油清净剂等方法加以控制。因此，应该允许汽油中含有一定量的烯烃。

INFLUENCE OF OLEFINS IN GASOLINE ON ENGINE EMISSION

The relationship between olefin content in gasoline and exhaust emission of gasoline engine is discussed. The research showed that as raising of olefin content in gasoline, the amounts of NO x and 1,3 butadiene in exhaust gas were increased; HC and VOC as well as formaldehyde were decreased; however, acetaldehyde and benzene remained constant. Increasing olefin content enhances the specific reactivity of exhaust gas for ozone formation. However, ozone forming potential is generally unaffected by changes in olefin content. Olefin is one of the octane sources, and adding gasoline detergent can control the negative effect of olefin on engine deposits. Certain amount of olefins in gasoline should be permitted.