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5934707 
Meetings & Symposia 
Semi-volatile organic compounds (SVOC) from a heavy-duty diesel engine 
Fanick, R; Kroll, S 
2018 
Global Automotive Management Council 
Emissions 2018 
English 
In engine exhaust, semi-volatile organic compounds (SVOC) are a group of compounds that form during combustion or are part of the fuel and lubricating oil. These compounds occur at very low concentrations in diesel engine exhaust. The methods for sampling, handling, and analyzing these compounds are critical to obtaining good results. Southwest Research Institute® (SwRI®) developed an improved dilute exhaust sampling method for sampling and analyzing SVOC in engine exhaust during transient engine operation. A total of 22 different SVOC were measured using a 2012 medium-duty diesel engine. This engine was equipped with a stock diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR) catalyst in series. Exhaust concentrations for SVOC were compared both with and without exhaust aftertreatment. As expected, concentrations for the SVOC were significantly higher in the engine-out exhaust than when the aftertreatment was present. Distribution of the SVOC between semi-volatile- and particulate-phase depended on the number of aromatic rings, the molecular weight, and the volatility of the individual compounds. © 2018 Global Automotive Management Council. All rights reserved. 
Catalysts; Catalytic oxidation; Diesel engines; Particles (particulate matter); Volatile organic compounds; Diesel oxidation catalyst; Diesel particulate filters; Exhaust aftertreatment; Heavy-duty diesel engine; Low concentrations; Selective catalytic reduction catalysts; Semivolatile organic compounds; Southwest Research Institute; Selective catalytic reduction