Abstract
Insoluble and adherent sediments are formed during ageing of liquid fuels. In this research, the extent of deposit formation was studied by adding specific nitrogen- and sulphur-containing compounds to upgraded coal-derived liquids, petroleum-derived JP-5 jet and diesel fuels. Of the nitrogen compounds tested, the ability to promote sediment formation is much greater for 2,5-dimethylpyrrole (DMP), than 2,6-dimethylquinoline (DMQ). Of the sulphur-containing compounds tested, the decreasing order is: thiophenol, tetrahydrothiophene, thiophene. Synergistic effects between DMP and thiophenol can occur. Degradation products obtained by heat stressing of fuels enriched with specific heteroatomic compounds were analysed by solid-state nuclear magnetic resonance, infrared, and X-ray photoelectron spectroscopy.
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