Olefinic fuels

Article Abstract:

The effect of olefinic fuel structure on automobile engine emissions has been. The study considered effects of pure ethylene, 1-butene, 1-hexene, diisobutylene and a diisobutylene/gasoline blend. Measurement of hydrocarbon (HC) emissions indicated that HC increases with molecular weight of the fuel. However, total HC emissions from alkene fuels was less than for the corresponding alkane fuels. For example ethylene HC emissions were 45% lower. Similar results from the blended fuel indicate that emissions from pure fuels are useful for predicting emissions from blended fuels.

Motor fuels, Olefins, Alkenes

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Comment on "A study of the stability of methanol-fueled vehicle emissions in Tedlar bags."

Article Abstract:

Methyl nitrite is not a main component in vehicle exhaust. The production of methyl nitrite from stored vehicle emissions may introduce errors in the determination of methyl nitrite levels in methanol-fueled automobile exhaust. Additionally, several studies that analyzed vehicle emissions determined that methyl nitrite levels were low compared to other exhaust components. These facts seem to repute a study conducted by P.L. Hanst and E.R. Stephens that found large concentrations of methyl nitrate in methanol-fueled bus exhaust.

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On-line measurement of benzene and toluene in dilute vehicle exhaust by mass spectrometry

Article Abstract:

An atmospheric pressure ionization (API) source used with tandem mass spectrometry is effective in measuring dilute hydrocarbons in automobile exhaust. An API source and a triple quadrupole spectrometer can measure benzene and toluene at real-time rates as high as 100 hertz. In contrast, a low-pressure chemical ionization source used with tandem mass spectrometry is less sensitive than the API source method.

Benzene, Toluene

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