PAH formation from jet stirred reactor pyrolysis of gasoline surrogates

Can Shao, Goutham Kukkadapu, Scott W. Wagnon, William J. Pitz, Mani Sarathy

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36 Scopus citations


Soot particles and their precursor polycyclic aromatic hydrocarbon (PAH) species, formed during combustion, are responsible for particulate emissions in gasoline direct injection (GDI) engines. To better understand the effects of fuel composition on formation of soot in GDI engines, the pyrolysis of several gasoline surrogates was studied in a jet-stirred reactor across a broad temperature range at atmospheric pressure and 1 s residence time. Fuel and intermediate species, including aromatics up to naphthalene, were measured using gas chromatography (GC). PAH concentrations from pyrolysis of surrogate fuels were compared to gain insight into the effects of fuel composition on PAH formation. In addition, synergistic effects were observed in pyrolysis experiments of binary blends. A detailed kinetic model, recently developed at Lawrence Livermore National Laboratory (LLNL), successfully captured the effects of blending and the concentration of major PAHs. Major reaction pathways are discussed, as well as the role of important intermediate species, such as acetylene, and resonantly stabilized radicals such as allyl, propargyl, cyclopentadienyl, and benzyl in the formation of PAH.
Original languageEnglish (US)
Pages (from-to)312-326
Number of pages15
JournalCombustion and Flame
StatePublished - Jun 20 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Research at KAUST was supported by the Office of Sponsored Research (OSR) under Award No. OSR-1026-CRG5-3022, and Saudi Aramco under the FUELCOM program. Research at LLNL was performed under the auspices of the U.S. Department of Energy (DOE), Contract DE-AC52-07NA27344 and conducted as part of the Co-Optimization of Fuels & Engines (Co-Optima) project, sponsored by the DOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies and Vehicle Technologies Offices.


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