Theoretical kinetic study of the low temperature oxidation of ethanol

René Fournet (1) , Pierre-Alexandre Glaude (1) , Roda Bounaceur (1) , Michel Molière (2)

1 DCPR - Département de Chimie Physique des Réactions
2 General Electric Energy Product France

In order to improve the understanding of the low temperature combustion of ethanol, high-level ab initio calculations were performed for elementary reactions involving hydroxyethylperoxy radicals. These radicals come from the addition of hydroxethyl radicals (•CH3CHOH and •CH2CH2OH) on oxygen molecule. Unimolecular reactions involving hydroxyethylperoxy radicals and their radical products were studied at the CBS-QB3 level of theory. The results allowed to highlight the principal ways of decomposition of these radicals. Calculations of potential energy surfaces showed that the principal channels lead to the formation of HO2 radicals which can be considered, at low temperature, as slightly reactive. However, in the case of CH3CH(OOH)O• radicals, a route of decomposition yields H atom and formic peracid, which is a branching agent that can strongly enhance the reactivity of ethanol in low temperature oxidation. In addition to these analyses, high-pressure limit rate constants were derived in the temperature range 400 to 1000 K.

Domaines: Chimie-Physique [physics.chem-ph]

René Fournet, Pierre-Alexandre Glaude, Roda Bounaceur, Michel Molière. Theoretical kinetic study of the low temperature oxidation of ethanol. European Combustion Meeting 2009 (ECM 2009), Apr 2009, Vienne, Austria. CD-ROM du congrès, 6 p. ⟨hal-00376729⟩