Deep catalytic oxidation of heavy hydrocarbons representative of diesel engine over Pt/Al2O3

Abstract : Deep oxidation by air on Pt supported on alumina of a large number of heavy hydrocarbons representative of those found in a real Diesel car exhaust has been studied. Light-off temperatures between 140 and 320°C on 1%Pt/alumina (80% metal dispersion) have been found. Results show that not only the physical state around the conversion area but also the chemical nature of the hydrocarbon plays an important role. Heavy hydrocarbons deep oxidation behaviour has been classified as a function of their chemical category (alkane, iso-alkane, alkene, aromatics etc..). Oxidation of binary mixtures of hydrocarbons has shown strong inhibition effects on n-alkane or CO oxidation by polycyclic compounds like 1-methylnaphthalene. In some cases, by-product compounds in the gas effluent (other than CO2 and H2O) have been identified by mass-spectrometry leading to oxidation mechanism proposals for different hydrocarbons. Catalyst nature (metal dispersion, content) influence has also been studied. It is shown that turn-over activity is favoured by the increase of the metal bulk size. Acidity influence of the carrier has shown only very little influence on n-alkane or diaromatic compound oxidation.
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Contributor : Fabrice Diehl <>
Submitted on : Friday, June 5, 2015 - 8:37:36 AM
Last modification on : Tuesday, January 22, 2019 - 3:51:43 PM
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  • HAL Id : tel-01160303, version 1




Fabrice Diehl. Deep catalytic oxidation of heavy hydrocarbons representative of diesel engine over Pt/Al2O3. Catalyse. Universite Pierre et Marie Curie, 1998. Français. ⟨tel-01160303⟩



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