Research on ammonia emissions characteristics from light-duty gasoline vehicles  

作　　者：Yingshuai Liu Yunshan Ge Jianwei Tan Haili Wang Yan Ding 

机构地区：[1]Weifang University of Science and Technology,Weifang 262700,China [2]National Lab of Auto Performance and Emission Test,School of Mechanical and Vehicular Engineering,Beijing Institute of Technology,Beijing 100081,China [3]Vehicle Emission Control Center,Ministry of Environmental Protection,Beijing 100012,China

出　　处：《Journal of Environmental Sciences》2021年第8期182-193,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51508304 and 41275133);。

摘　　要：In this study,ammonia emissions characteristics of typical light-duty gasoline vehicles were obtained through laboratory vehicle bench test and combined with New European Driving Cycle(NEDC)condition and Worldwide Harmonized Light Vehicles Test Cycle(WLTC)condition.The influence of ambient temperature on ammonia emissions is mainly concentrated in the cold start stage.The influence of ambient temperature on ammonia emission is shown that the ammonia emissions of light-duty gasoline vehicles under ambient temperature conditions(14 and 23℃)are lower than those under low ambient temperature conditions(-7℃)and high ambient temperature conditions(35 and 40℃).The influence of TWC on ammonia emission is shown that ammonia is a by-product of the catalytic reduction reaction of conventional gas pollutants in the exhaust gas in the TWC.Under NEDC operating conditions and WLTC operating conditions,ammonia emissions after the catalyst are 45 times and 72 times that before the catalyst,respectively.In terms of ammonia emissions control strategy research,Pd/Rh combination can reduce NH3 formation more effectively than catalyst with a single Pd formula.Precise control of the engine’s air-fuel ratio and combination with the optimized matched precious metal ratio TWC can effectively reduce ammonia emissions.

关 键 词：Ammonia emissions Light-duty gasoline vehicles Three-way catalytic converter Ambient temperature Air-fuel ratio 

分 类 号：X734.2[环境科学与工程—环境工程]