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Polycyclic Aromatic Hydrocarbons in Diesel Engine Exhaust Both with and without Aftertreatment
Technical Paper
2018-01-1812
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Since the conception of the internal combustion engine, smoky and ill-smelling exhaust was prevalent. Over the last century, significant improvements have been made in improving combustion and in treating the exhaust to reduce these effects. One group of compounds typically found in exhaust, polycyclic aromatic hydrocarbons (PAH), usually occurs at very low concentrations in diesel engine exhaust. Some of these compounds are considered carcinogenic, and most are considered hazardous air pollutants (HAP). Many methods have been developed for sampling, handling, and analyzing PAH. For this study, an improved method for dilute exhaust sampling was selected for sampling the PAH in diesel engine exhaust. This sampling method was used during transient engine operation both with and without aftertreatment to show the effect of aftertreatment. A total of 23 different PAH were measured using a 2012 medium-duty diesel engine equipped with a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR) catalyst in series. The PAH were then analyzed by gas chromatography/mass (GC/MS) spectrometry to determine the individual concentrations for engine-out (without aftertreatment) and aftertreatment-out emissions. Concentrations for the engine-out PAH were significantly higher than when the aftertreatment was present. PAH in the exhaust were then compared to the PAH in the fuel.
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Citation
Fanick, E. and Kroll, S., "Polycyclic Aromatic Hydrocarbons in Diesel Engine Exhaust Both with and without Aftertreatment," SAE Technical Paper 2018-01-1812, 2018, https://doi.org/10.4271/2018-01-1812.Data Sets - Support Documents
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