Low temperature PAH formation in diesel combustion

摘要

A study has been made of the formation of PAH from biodiesel and conventional diesel fuel using a flow cell reactor at temperatures of 600-900 C. The reaction mechanism has been validated by modelling studies using Chemkin. Pyrolysis of 9-[~(13)C]methylphenanthrene was undertaken to investigate the demethyla-tion reaction of methyl-PAH compounds present in the original petroleum diesel. The product profiles obtained are shown to be similar for all fuels studied, pointing to a commonality of mechanism after the decomposition of the parent hydrocarbon. Dealkylation was demonstrated as the main reaction using the 9-[~(13)C]methylphenanthrene, however other [~(13)C] labelled species were also formed.