Abstract
Effects of the composition of the fuel on the emission of benzo(a)pyrene (B(a)P) from a diesel engine were investigated using a single cylinder test engine and 1) pure hydrocarbon-mixed fuels composed of n-cetane, heptamethylnonane(HMN), α-methylnaphthalene and a cetane number improver and 2) subfraction-mixed fuels composed of n-cetane, HMN and subfractions of diesel fuels prepared by fractional distillation and chromatographic separation. Aromaticity (aromatic carbon content) of the fuel was the principal factor for B(a)P emission, that is, B(a)P emission rate generally increased with the aromaticity of the fuel. Further effects by cetane number, boiling range and the content of B(a)P in the fuel were also considered.
