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Reductive Chemistry of Aromatic Hydrocarbon Molecules

  • Chapter
Chemistry of Engine Combustion Deposits

Abstract

In approaching the chemistry of engine combustion deposits, one is faced with several difficult problems. First of all, for any given specimen, there is a limited amount of material, with typical six cylinder engine runs giving less than 20 grams of deposit. Despite their small size, these samples are quite heterogeneous. As scraped from the walls of the combustion volume, they contain refractory polymeric carbon, physisorbed aromatic hydrocarbons from the fuel, inorganic material from the lubricant, as well as bits of metal from the engine. Different areas of the combustion volume can give rise to deposits of different properties. From the chemical point of view, the deposits are somewhat of an enigma; although arising in a combustion environment, the deposits are about 65 wgt % carbon. Even though one might expect such carbon to resemble kinetically inactive species as graphite or glassy carbon, it most resembles bituminous coals in its thermogravimetric behavior.

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Ebert, L.B. (1985). Reductive Chemistry of Aromatic Hydrocarbon Molecules. In: Ebert, L.B. (eds) Chemistry of Engine Combustion Deposits. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2469-0_18

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