Abstract
Abstract The effects of fuel and oil structure on the product gas emissions from a combustion bomb are studied for various fuel-oil systems. Five oils (a synthetic motor oil, a petroleum-based motor oil, an oxypolypropylene oil, an oxypolyethylene-polypropylene oil, and glycerol) were tested in combination with two fuel blends (ethane-ethanol and ethane-methanol). Gas samples from the reactor were analyzed by gas chromatography and Fourier transform infrared spectroscopy. The results show that the principal exhaust effluent is unburnt fuel. Fuel and oil combinations of unmatched polarity such as ethane and glycerol produce significantly lower organic emissions than matched fuels and oils (e.g. methanol and glycerol) as expected from liquid solubility data. For a fixed mass of oil, the product of Henry's constant and the molecular weight of the oil can be used to specify the relative change in the absorptive fuel capacity for vastly different lubricants. When sufficient NO2 is present in the product gases of the alcohol-fueled experiments, we observe that the remaining organic effluent is a mixture of unburnt fuel and alkyl nitrites formed from the particular alcohol and NO2 during reactor cool-down.
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