气候变化领域集成服务门户(CCPortal): Measuring and modeling the primary organic aerosol volatility from a modern non-road diesel engine

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DOI	10.1016/j.atmosenv.2019.117221
	Measuring and modeling the primary organic aerosol volatility from a modern non-road diesel engine
	Jathar S.H.; Sharma N.; Galang A.; Vanderheyden C.; Takhar M.; Chan A.W.H.; Pierce J.R.; Volckens J.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	Primary organic aerosol (POA) in diesel exhaust is semi-volatile and partitions mass between the gas and particle phases. POA volatility is not well understood for alternative fuels, varying engine loads, and for engines that feature modern emissions controls. In this study, we performed filter-based measurements of diesel exhaust from a modern-day non-road diesel engine for two different fuels (conventional diesel and soy-based biodiesel), two different engine loads (idle and 50% load), and with and without an emissions control device. Filters were analyzed offline to determine the POA volatility in two different ways: positive artifact on quartz filters at varying dilution ratios and speciation of alkanes. The POA volatility determined from our data suggests that POA mass emissions from diesel exhaust may be reduced by a factor of five with dilution to atmospherically relevant concentrations. These results are generally consistent with previous literature on POA volatility from non-road diesel engines but not with that from on-road diesel vehicles. POA volatility may hence need to be treated separately for non- and on-road sources in atmospheric models. Surprisingly, the POA volatility did not appear to vary under different combinations of fuel, engine load, and emissions control experiments performed, suggesting that POA might be dominated by unburned lubricating oil and its oxidation products. The POA volatility estimated from the speciation of alkanes was found to agree well with that determined from the dilution experiments. A kinetic model was used to calculate the gas/particle partitioning of POA in the dilution system. The modeling suggests that residence times in the dilution tunnel need to be on the order of minutes to allow the POA in the diluted exhaust to achieve gas/particle equilibrium. The use of short residence times (less than tens of seconds), similar to those used in conventional dilution systems, may bias the measurement of POA mass emissions in such systems and is of particular concern for emissions from cleaner, more modern combustion sources. The precise magnitude and direction of the bias depends on the exhaust temperature before dilution, tailpipe seed concentrations, dilution ratio, and residence times in the dilution tunnel. We recommend that kinetic models such as those used in this work be used, instead of using equilibrium assumptions, to inform the design and operation of the dilution tunnels as well to interpret the POA volatility from measurements made with those dilution tunnels. © 2019 Elsevier Ltd
关键词	Combustion emissions Gas chromatography Gas/particle partitioning Kinetic modeling Primary organic aerosol Volatility
语种	英语
scopus关键词	Aerosols; Alternative fuels; Combustion; Diesel engines; Dilution; Exhaust systems (engine); Gas chromatography; Hydrocarbons; Kinetic parameters; Kinetic theory; Paraffins; Petroleum industry; Roads and streets; Combustion emissions; Gas/particle partitioning; Kinetic modeling; Organic aerosol; Volatility; Gas emissions; alkane; lubricating agent; volatile organic compound; aerosol; diesel engine; gas chromatography; measurement method; modeling; oxidation; partitioning; reaction kinetics; temperature effect; adsorption; aerosol; combustion; comparative study; concentration (parameter); controlled study; diesel engine; dilution; evaporation; exhaust gas; gas; measurement; oxidation; particulate matter; phase partitioning; priority journal; retention time; soot; temperature; vaporization
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249402
作者单位	Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, United States; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada; Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Jathar S.H.,Sharma N.,Galang A.,et al. Measuring and modeling the primary organic aerosol volatility from a modern non-road diesel engine[J],2020,223.
APA	Jathar S.H..,Sharma N..,Galang A..,Vanderheyden C..,Takhar M..,...&Volckens J..(2020).Measuring and modeling the primary organic aerosol volatility from a modern non-road diesel engine.ATMOSPHERIC ENVIRONMENT,223.
MLA	Jathar S.H.,et al."Measuring and modeling the primary organic aerosol volatility from a modern non-road diesel engine".ATMOSPHERIC ENVIRONMENT 223(2020).