Etudes expérimentales des réactions des radicaux OH et des atomes d’oxygène d’intérêt pour l’atmosphère et la combustion

Abstract : The objective of this work was to study the reactions of alkyl nitrates with OH radicals relevant to atmosphere and reactions of OH radical with alkanes and oxygen atoms with olefins of interest for combustion chemistry. All reactions were studied in low pressure flow reactors (including high temperature flow reactor developed during the thesis) coupled to a quadrupole mass spectrometer with electron impact ionization. For OH reaction with nitrates, the temperature dependence of the rate constant was measured in an extended temperature range for ten alkyl nitrates, for eight of them for the first time. For six nitrates, the products of reaction pathway leading to direct recycling of NO₂ (H atom abstraction from α carbon) were observed and their yields were measured. The large amount of data obtained in this work has been used for an update of the structure-activity relation (SAR) for the reactions of alkyl nitrates with OH and will improve existing atmospheric models. For the reactions of OH radicals with three alkanes and O atoms with ethene and propene the rate constants were measured over a wide temperature range, 220-900 K. Moreover, the distribution of the products of the multichannel reactions O + olefin was determined as a function of temperature for the first time. These results are expected to improve current combustion models.
Document type :
Theses
Complete list of metadatas

Cited literature [76 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01493991
Contributor : Abes Star <>
Submitted on : Wednesday, March 22, 2017 - 2:47:06 PM
Last modification on : Tuesday, March 19, 2019 - 6:28:02 PM
Long-term archiving on : Friday, June 23, 2017 - 1:13:23 PM

File

julien-morin_3496.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01493991, version 1

Collections

Citation

Julien Morin. Etudes expérimentales des réactions des radicaux OH et des atomes d’oxygène d’intérêt pour l’atmosphère et la combustion. Autre. Université d'Orléans, 2016. Français. ⟨NNT : 2016ORLE2034⟩. ⟨tel-01493991⟩

Share

Metrics

Record views

627

Files downloads

1568