Oxygenates are widely used as fuel additives to reduce soot and polycyclic aromatic hydrocarbon emissions in exhaust gases from automotive engines. In this work, the effect of propylene oxide (PO) additive on the composition of intermediate combustion products, including mainly soot precursors, in a flame of a fuel-rich pre-mixed n-heptane/toluene/O2/Ar mixture at 1 atm is examined using flame sampling molecular beam mass spectrometry. Only ~2 % (in mole basis) of propylene oxide added to n-heptane/toluene mixture was found to reduce significantly (by ~35-57%) the peak mole fractions of benzene, phenol, styrene, ethylbenzene, indene, which are major intermediate products of toluene conversion in the flame and soot precursors. However, the PO additive exhibited no influence on the peak mole fractions of small hydrocarbons like methane, acetylene, ethylene, and flame radicals (methyl, HO2, propargyl). Simulations performed using a detailed chemical kinetic mechanism involving reactions for n-heptane, toluene and PO conversion in flames showed no effect of PO addition on concentration of the abovementioned flame intermediates. Future work is therefore needed to improve the reaction mechanism in order to explain and reproduce the observed tendencies.
|Publication status||Published - 1 Jul 2019|
|Event||12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan|
Duration: 1 Jul 2019 → 5 Jul 2019
|Conference||12th Asia-Pacific Conference on Combustion, ASPACC 2019|
|Period||01.07.2019 → 05.07.2019|