Fuel Structure and the Nature of Engine-Out Emissions

Paper #:
  • 941960

Published:
  • 1994-10-01
Citation:
Kaiser, E., Siegl, W., and Anderson, R., "Fuel Structure and the Nature of Engine-Out Emissions," SAE Technical Paper 941960, 1994, https://doi.org/10.4271/941960.
Pages:
12
Abstract:
For several years, a single-cylinder, spark-ignited engine without catalyst has been operated at Ford on single-component fuels that are constituents of gasoline as well as on simple fuel mixtures. This paper presents a review of these experiments as well as others pertinent to understanding hydrocarbon emissions. The engine was run at four steady-state conditions which are typical of normal operation. The fuel structure and the engine operating conditions affected both the total HC emissions and the reactivity of these emissions for forming photochemical smog in the atmosphere. These experiments identified major precursor species of the toxic HC emissions benzene and 1,3-butadiene to be alkylated benzenes and either straight chain terminal olefins or cyclic alkanes, respectively. In new data presented, the primary exhaust hydrocarbon species from MTBE combustion is identified as isobutene.
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