1,3-丁二烯-NOx光照产生二次有机气溶胶影响因素的研究

Research on the influence factors of secondary qrganic aerosol formed by 1, 3-butadiene-NO_x irradiation

在室温为(297±2) K的条件下,采用自制的烟雾箱研究了光照强度与反应物初始浓度比值对1,3-丁二烯与NO_x共存的光照体系生成二次有机气溶胶(SOA)的影响。结果表明:SOA数浓度及1,3-丁二烯的分解率均随光照强度的增强而上升,SOA颗粒尺度及SOA数浓度随比值[C_4H_6]_0/[NO_2]_0的增加均有较为明显的增长,并且与颗粒物数浓度最大值呈现出较好的线性关系,傅里叶红外分析仪(FT-IR)在线测得C_4H_6-NOX光照体系中气相产物主要有CO、CO_2、甲醛和丙烯醛等。

A series of experiments were conducted in a self-made photochemical smog chamber,which was used to research the effect of light intensity and initial on the secondary organic aerosol(SOA)production in the photochemical reactions of 1,3-butadiene(C4H6)and NO2 under room temperature of(297±2)K.The results show that the maximum concentration of SOA and the conversion rate of 1,3-butadiene are both increased with the increase of light intensity;the particle size and the number of SOA have a significant increase with the increase of the ratio of C4H6 to NO2 concentration of reactors([C4H6]0/[NO2]0),and show a good linear relationship with the maximum concentration of the number of SOA.The main gas-phase products in the were determined by the Fourier transform infrared analyzer(FT-IR).are CO,CO2,carbon dioxide,acrolein and formaldehyde,etc.