PAH formation from jet stirred reactor pyrolysis of gasoline surrogates

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

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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
Volume219
DOIs
StatePublished - Jun 20 2020

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