PM and PAH formed by pyrolysis and oxidation of dodecane under low temperature.

Particulate matter (PM) formed by the combustion of hydrocarbon fuels causes air pollution and has harmful effects on human health. Therefore, its reduction is required. In general, the main component of PM is soot, and its precursor is thought polycyclic aromatic hydrocarbon (PAH). In this study PAH and PM formation by pyrolysis and oxidation of dodecane under low temperature condition (1073K～1323K) using a flow reactor were investigated under φ = ∞, 6.2 and 2.8 conditions. In addition, numerical analysis for PAH mass concentration and reaction path analysis were also performed using a CHEMKIN-Pro software. As a result, the lower amount each PAH was formed under higher oxidation concentration condition. The lower amount PM also formed under higher oxygen concentration. Therefore, it was found that the amount of both PAH and PM under with oxygen condition was lower than under without oxygen condition. For single-ring benzene, the result of a gas chromatograph (GC) analysis and result of numerical analysis were in good agreement. However, for two-ring naphthalene, both results were not agreement. Further, reaction pathway analysis about PAH was performed and discussed.