Effects of Toluene Content in Fuel on Aromatic Emissions in the Exhaust

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Abstract
The effect of the toluene level in fuels on the concentrations of aromatic products in the exhaust was studied. The fuel blends contained 20, 40, 60, and 80 weight per cent toluene and the balance consisted of isooctane and n-heptane. Each blend had a research octane number of 100. When the exhaust products are expressed as a mole fraction of toluene burned: benzene and benzaldehyde showed no change, and ethylbenzene and styrene increased, with decreasing toluene content of the fuel blends. The fractional mole concentration of unburned toluene in the exhaust decreased as the paraffin content of the blends increased. The results can be explained on the basis of toluene decomposition and the subsequent reactions of the resulting radicals.

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