正壬基环己烷与OH自由基反应产物的GC-MS检测研究

Hydroxyl Radical and Nonylcyclohexane Reaction Product GC-MS Detection

机动车尾气排放,其中很大一部分是链状烷烃,它与环境空气中的大气氧化剂(O3、OH自由基、NO3自由基、Cl等)发生反应,其产物最终能够形成二次有机气溶胶(SOA),但目前对链状烷烃的氧化机理还不清楚。模拟OH自由基与正壬基环己烷反应,建立链状烷烃与OH自由基反应产物的分析方法,并对其反应机制进行初步研究。结果显示,C15烷烃与OH自由基在O2存在的条件下,首先反应生成了一系列的醛或醇,然后进一步反应,碳链断裂生成了多官能团含氧小分子等SOA前体物。

Motor vehicle exhaust emissions is one of the important sources of VOCs,much of it is long-chain alkane. This compounds and atmospheric oxidant（ O3,OH,NO3,Cl,etc.） reaction product is an important source of secondary organic aerosol（ SOA）. But because of the long-chain alkane oxidation mechanism is not clear,the chemical reaction between long-chain alkane and SOA is often underestimate. the paper has established long-chain alkane and OH radical reaction analysis method,and also analyzed the long-chain alkane and OH reaction product and discussed the reaction mechanism. the results shows that in the presence of O2,the reaction of C15 and OH radicals is a series of aldehydes or alcohols firetiy,and then the carbon chain fracture has generated the precursors of many functional groups including oxygen-containing small molecules.