关键词: 汽油, 烃组成, 排放, 烯烃, 芳烃

Abstract: Effects of the olefin and aromatic content of gasoline on the automobile exhaust emission during normal/low temperature cold start and evaporative emission were studied using six gasoline samples with various hydrocarbon compositions and vehicles meeting China National Standard for automobile emission III (E III) and emission standard IV (E IV). Results show that the effect of gasoline compositions on emission is significantly related with the types of vehicles, E IV vehicles exhibit the lowest emissions of HC, CO and NOx when using gasoline with an aromatic volume content of 35% and an olefin volume content of 25%, indicating that the olefin content in gasoline is not the lower the better. The effect of aromatic content is also related to the engine technology, however, on the whole exhaust emissions decrease with the decrease of aromatic content. The total evaporative emission increases with the increase of gasoline olefin content. The HC and CO emissions during cold start at low temperature increase with the increase of the total content of olefin and aromatics.

Key words: Gasoline, Hydrocarbon Composition, Exhaust Emissions, olefin, aromatic hydrocarbon