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据报道,有关部门已决定,北京将逐步使用无铅汽油,停止使用含铅汽油。 所谓含铅汽油,就是汽油中添加了四乙基铅的汽油。为什么要向汽油中添加四乙基铅呢? 众所周知,标号低的汽油,如60和70号汽油以及炼制不精的高标号汽油如93号汽油,发动机燃用时会产生爆震(俗说敲缸),从而损坏发动机。为了减轻乃至抑制爆震,就须向这类汽油中添加抗爆剂,而四乙基铅就是一种抗爆添加剂。向汽油中添加四乙基铅后,发动机爆震减轻了,但由于汽油中有了铅的成分,燃烧后产生铅的化合物并排入大气,又会对大气造成污染继而对生物尤其对人造成伤害。汽车燃
It is reported that relevant departments have decided that Beijing will gradually use unleaded petrol and stop using leaded petrol. The so-called leaded gasoline, petrol is added to the four ethyl lead gasoline. Why is it necessary to add tetraethyl lead to gasoline? As we all know, low-grade gasoline, such as 60 and 70, as well as refining of refined high-grade gasoline, such as 93 gasoline, the engine will produce knock knock ), Thus damaging the engine. In order to reduce or even inhibit knocking, antiknock agents must be added to this type of gasoline, and tetraethyl lead is an antiknock additive. After the addition of tetraethyl lead to gasoline, engine detonation has been reduced, but because of the presence of lead in the gasoline, the resulting lead compounds are released into the atmosphere after combustion, which in turn can cause pollution to the atmosphere and, in particular, to humans hurt. Car burning