Factors influencing the emissions of nitrated-polynuclear aromatic hydrocarbons(nitro-PAH) from diesel engines

Dennis Schuetzle, Joseph M. Perez

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The potential problem of 1-nitropyrene (1-NP) formation during filter sampling of diesel emissions from dilution tubes is assessed. Rates of formation are calculated using data generated from several independent filter exposure studies. A portion of the 1-NP (12% average) found in participates collected from light-duty (LDD) and heavy-duty diesels (HOD) was found to be due to formation on the filter under average sampling conditions of 10-15/1 dilution at 44°C with 3 ppm NO2 for 23 min. On the average, the concentration of 1-NP in participates emitted from HDD is 16 times less than that found in LDD run under similiar transient conditions. The average emission rate of 1-NP generated from the LDD and HDD was 4.7 μg/km and 1.5 μg/km, respectively for the vehicles operating under Federal Test Procedure (FTP)-transient conditions. Under operating conditions which increase exhaust temperature (increased speed and load), the concentration of nitro-PAH is significantly reduced with a concurrent increase in the concentration of partially oxidized nitro-PAH and dinitro-PAH. The concentration of 1-NP in the particulates measured from HDD in these dilution tube studies (0.33-0.95 ppm, depending upon engine load) is comparable to that measured in highway tunnel experiments (0.54 ppm average).

Original languageEnglish (US)
Pages (from-to)751-755
Number of pages5
JournalJournal of the Air Pollution Control Association
Volume33
Issue number8
DOIs
StatePublished - Aug 1983

Fingerprint

Aromatic hydrocarbons
diesel engine
Polycyclic aromatic hydrocarbons
aromatic hydrocarbon
Dilution
Diesel engines
PAH
dilution
filter
Sampling
sampling
diesel
engine
Tunnels
tunnel
road
Engines
experiment
temperature
Experiments

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Science(all)
  • Pollution
  • Earth and Planetary Sciences(all)

Cite this

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abstract = "The potential problem of 1-nitropyrene (1-NP) formation during filter sampling of diesel emissions from dilution tubes is assessed. Rates of formation are calculated using data generated from several independent filter exposure studies. A portion of the 1-NP (12{\%} average) found in participates collected from light-duty (LDD) and heavy-duty diesels (HOD) was found to be due to formation on the filter under average sampling conditions of 10-15/1 dilution at 44°C with 3 ppm NO2 for 23 min. On the average, the concentration of 1-NP in participates emitted from HDD is 16 times less than that found in LDD run under similiar transient conditions. The average emission rate of 1-NP generated from the LDD and HDD was 4.7 μg/km and 1.5 μg/km, respectively for the vehicles operating under Federal Test Procedure (FTP)-transient conditions. Under operating conditions which increase exhaust temperature (increased speed and load), the concentration of nitro-PAH is significantly reduced with a concurrent increase in the concentration of partially oxidized nitro-PAH and dinitro-PAH. The concentration of 1-NP in the particulates measured from HDD in these dilution tube studies (0.33-0.95 ppm, depending upon engine load) is comparable to that measured in highway tunnel experiments (0.54 ppm average).",
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Factors influencing the emissions of nitrated-polynuclear aromatic hydrocarbons(nitro-PAH) from diesel engines. / Schuetzle, Dennis; Perez, Joseph M.

In: Journal of the Air Pollution Control Association, Vol. 33, No. 8, 08.1983, p. 751-755.

Research output: Contribution to journalArticle

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