首页|Characterization and prediction of tailpipe ammonia emissions from in-use China 5/6 light-duty gasoline vehicles

Characterization and prediction of tailpipe ammonia emissions from in-use China 5/6 light-duty gasoline vehicles

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On-road tailpipe ammonia(NH3)emissions contribute to urban secondary organic aerosol formation and have direct or indirect adverse impacts on the environment and human health.To understand the tailpipe NH3 emission characteristics,we performed comprehensive chassis dynamometer measurements of NH3 emission from two China 5 and two China 6 light-duty gasoline vehicles(LDGVs)equipped with three-way catalytic converters(TWCs).The results showed that the distance-based emission factors(EFs)were 12.72±2.68 and 3.18±1.37 mg/km for China 5 and China 6 LDGVs,respectively.Upgrades in emission standards were associated with a reduction in tailpipe NH3 emission.In addition,high NH3 EFs were observed during the engine warm-up period in cold-start cases owing to the intensive emissions of incomplete combustion products and suitable catalytic temperature in the TWCs.Notably,based on the instantaneous NH3 emission rate,distinct NH3-emitting events were detected under high/extra high velocity or rapid acceleration.Furthermore,NH3 emission rates correlated well with engine speed,vehicle specific power,and modified combustion efficiency,which were more easily accessible.These strong correlations were applied to reproduce NH3 emissions from China 5/6 LDGVs.The predicted NH3 EFs under different dynamometer and real-world cycles agreed well with existing measurement and prediction results,revealing that the NH3 EFs of LDGVs in urban routes were within 8.55-11.62 mg/km.The results presented here substantially contribute to improving the NH3 emission inventory for LDGVs and predicting on-road NH3 emissions in China.

NH3 instantaneous emissionsCatalytic temperatureVehicle specific powerCombustion efficiencyEmission prediction

Lewei Zeng、Fengbin Wang、Shupei Xiao、Xuan Zheng、Xintong Li、Qiyuan Xie、Xiaoyang Yu、Cheng Huang、Qingyao Hu、Yan You、Ye Wu

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College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China

State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China

China Automotive Technology and Research Center Co.Ltd.,Tianjin 300300,China

CAT ARC Automotive Test Center(Guangzhou)Co.Ltd.,Guangzhou 511300,China

State Environmental Protection Key Laboratory of Cause and Prevention of Urban Air Pollution Complex,Shanghai Academy of Environmental Sciences,Shanghai 200233,China

National Observation and Research Station of Coastal Ecological Environments in Macao,Macao Environmental Research Institute,Macau University of Science and Technology,Macao SAR 999078,China

School of Environment,State Key Joint Laboratory of Environment Simulation and Pollution Control,Tsinghua University,Beijing 100084,China

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国家自然科学基金国家自然科学基金国家自然科学基金Guangdong Basic and Applied Basic Research Foundation(China)Guangdong Basic and Applied Basic Research Foundation(China)Basic Research of Shenzhen Science and Technology Innovation Commission(China)

5197840442105100419771802021A15151102972022A1515010866JCYJ20190808145218827

2024

10.1007/s11783-024-1766-9

环境科学与工程前沿
高等教育出版社

环境科学与工程前沿

影响因子：0.545
ISSN：2095-2201
年,卷(期)：2024.18(1)
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