氮氧化物是大气污染的重要来源之一,它的毒性大,对农作物、对人的健康都有严重影响。弄清它的来源,测量并控制它的排放量、对环境保护有十分重要的意义。已经知道,氮氧化物主要来源于燃料的燃烧。尤其是在高温情况下燃烧会生成更多的NO_x。煤、重油等在炉内燃烧时,燃料中的氮和空气中的氮被氧化而生成NO_x,从烟囱中排出;以汽油或柴油为燃料的内燃机,由于汽油 Nitrogen oxides are one of the important sources of air pollution. They are highly toxic and have a serious impact on crops and human health. Understanding its source, measuring and controlling its emissions, is of great importance to environmental protection. It is known that nitrogen oxides mainly come from the combustion of fuels. In particular, burning at high temperatures produces more NOx. When coal, heavy oil and the like are burned in the furnace, the nitrogen in the fuel and the nitrogen in the air are oxidized to generate NO x and are discharged from the chimney. The internal combustion engine which uses gasoline or diesel as a fuel,