Evolution of gas solid pollutants in photochemical reaction of automobile exhaust and atmosphere
1. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China; 2. School of Geographic Science, Nantong University, Nantong, Jiangsu 226019, China
Abstract：Under the different temperature and humidity conditions, the photochemical reaction experiments of automobile exhaust and atmosphere were carried out with the smog chamber system. By measuring the substance concentration at different time, the generation and evolution laws of different gases and solids in the photochemical reaction of automobile exhaust and atmosphere were revealed. The experimental results show that in the photochemical reaction of automobile exhaust and atmosphere, NO and HC mainly come from exhaust gas, while NO2 and O3 are mainly new products with mainly secondary particles of PM2.5. With the increasing of reaction time, the volume fractions of NO and HC are declined, and the declining rate of NO volume fraction is negatively related to temperature and humidity. The declining rate of HC volume fraction is positively related to temperature and humidity. The volume fractions of NO2 and O3 and the mass concentration of PM2.5 are rised rapidly in the beginning with latter gradual change, and the formation rates of NO2, O3 and PM2.5 are positively related to the humidity. Compared with temperature, the relative humidity has greater effect on the rate of pollutant change. The main period of generating secondary particles in the photochemical reaction of automobile exhaust and atmosphere is initial 1.5 h. The high exhaust gas content is beneficial to generating secondary particles. The generated secondary particulates for diesel vehicle in the atmosphere are more than those for gasoline vehicle.
戴兵, 石鑫, 袁银男, 钱鹏, 杨宗苓. 汽车尾气与大气光化反应中气固态污染物演变规律[J]. 江苏大学学报（自然科学版）, 2017, 38(6): 638-644.
DAI Bing, SHI Xin, YUAN Yin-Nan, QIAN Peng, YANG Zong-Ling.
Evolution of gas solid pollutants in photochemical reaction of automobile exhaust and atmosphere[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2017, 38(6): 638-644.
2017, Vol. 38 
