Detailed kinetic study of anisole pyrolysis and oxidation to understand tar formation during biomass combustion and gasification
Identifieur interne : 000479 ( Main/Exploration ); précédent : 000478; suivant : 000480Detailed kinetic study of anisole pyrolysis and oxidation to understand tar formation during biomass combustion and gasification
Auteurs : Milena Nowakowska [France] ; Olivier Herbinet [France] ; Anthony Dufour (génie des procédés) [France] ; Pierre-Alexandre Glaude [France]Source :
- Combustion and flame [ 0010-2180 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Biomasse.
English descriptors
- KwdEn :
- mix :
Abstract
Anisole was chosen as the simplest surrogate for primary tar from lignin pyrolysis to study the gas-phase chemistry of methoxyphenol conversion. Methoxyphenols are one of the main precursors of PAH and soot in biomass combustion and gasification. These reactions are of paramount importance for the atmospheric environment, to mitigate emissions from wood combustion, and for reducing tar formation during gasification. Anisole pyrolysis and stoichiometric oxidation were studied in a jet-stirred reactor (673-1173 K, residence time 2 s, 800Torr (106.7 kPa), under dilute conditions) coupled with gas chromatography-flame ionization detector and mass spectrometry. Decomposition of anisole starts at 750 K and a conversion degree of 50% is obtained at about 850 K under both studied conditions. The main products of reaction vary with temperature and are phenol, methane, carbon monoxide, benzene, and hydrogen. A detailed kinetic model (303 species, 1922 reactions) based on a combustion model for light aromatic compounds has been extended to anisole. The model predicts the conversion of anisole and the formation of the main products well. The reaction flux analyses show that anisole decomposes mainly to phenoxy and methyl radicals in both pyrolysis and oxidation conditions. The decomposition of phenoxy radicals is the main source of cyclopentadienyl radicals, which are the main precursor of naphthalene and heavier PAH in these conditions.
Url:
Affiliations:
- France
- Grand Est, Lorraine (région)
- Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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Le document en format XML
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<term>Formation</term>
<term>Gasification</term>
<term>Kinetic model</term>
<term>Kinetics</term>
<term>Modeling</term>
<term>Oxidation</term>
<term>Pyrolysis</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Cinétique</term>
<term>Anisole</term>
<term>Pyrolyse</term>
<term>Oxydation</term>
<term>Goudron</term>
<term>Formation</term>
<term>Biomasse</term>
<term>Combustion</term>
<term>Gazéification</term>
<term>Modèle cinétique</term>
<term>Modélisation</term>
<term>Ether</term>
<term>Domaine température 673-1173 K</term>
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<keywords scheme="mix" xml:lang="en"><term>Anisole</term>
<term>Biomass</term>
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<front><div type="abstract" xml:lang="en">Anisole was chosen as the simplest surrogate for primary tar from lignin pyrolysis to study the gas-phase chemistry of methoxyphenol conversion. Methoxyphenols are one of the main precursors of PAH and soot in biomass combustion and gasification. These reactions are of paramount importance for the atmospheric environment, to mitigate emissions from wood combustion, and for reducing tar formation during gasification. Anisole pyrolysis and stoichiometric oxidation were studied in a jet-stirred reactor (673-1173 K, residence time 2 s, 800Torr (106.7 kPa), under dilute conditions) coupled with gas chromatography-flame ionization detector and mass spectrometry. Decomposition of anisole starts at 750 K and a conversion degree of 50% is obtained at about 850 K under both studied conditions. The main products of reaction vary with temperature and are phenol, methane, carbon monoxide, benzene, and hydrogen. A detailed kinetic model (303 species, 1922 reactions) based on a combustion model for light aromatic compounds has been extended to anisole. The model predicts the conversion of anisole and the formation of the main products well. The reaction flux analyses show that anisole decomposes mainly to phenoxy and methyl radicals in both pyrolysis and oxidation conditions. The decomposition of phenoxy radicals is the main source of cyclopentadienyl radicals, which are the main precursor of naphthalene and heavier PAH in these conditions.</div>
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