Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 53, Issue 6, Pages 3037-3047Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b06418
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Funding
- South Coast Air Quality Management District (SCAQMD) [15625]
- Manufacturers of Emission Controls Association (MEGA) [15040420]
- National Center for Sustainable Transportation (NCST) graduate fellowship
- National Science Foundation Award (NSF) [1151893]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1151893] Funding Source: National Science Foundation
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The effects of photochemical aging on exhaust emissions from two light-duty vehicles with gasoline direct injection (GDI) engines equipped with and without catalyzed gasoline particle filters (GPFs) were investigated using a mobile environmental chamber. Both vehicles with and without the GPFs were exercised over the LA92 drive cycle using a chassis dynamometer. Diluted exhaust emissions from the entire LA92 cycle were introduced to the mobile chamber and subsequently photochemically reacted. It was found that the addition of catalyzed GPFs will significantly reduce tailpipe particulate emissions and also provide benefits in gaseous emissions, including nonmethane hydrocarbons (NMHC). Tailpipe emissions composition showed important changes with the use of GPFs by practically eliminating black carbon and increasing the fractional contribution of organic mass. Production of secondary organic aerosol (SOA) was reduced with GPF addition, but was also dependent on engine design which determined the amount of SOA precursors at the tailpipe. Our findings indicate that SOA production from GDI vehicles will be reduced with the application of catalyzed GPFs through the mitigation of reactive hydrocarbon precursors.
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