The radical internal coke structure as a ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
The radical internal coke structure as a fingerprint of the zeolite framework
Auteur(s) :
Ben Tayeb, Karima [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Hamieh, Soumaya [Auteur]
Canaff, Christine [Auteur]
Nguyen, Hon [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Pinard, Ludovic [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Hamieh, Soumaya [Auteur]
Canaff, Christine [Auteur]
Nguyen, Hon [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Pinard, Ludovic [Auteur]
Titre de la revue :
Microporous and Mesoporous Materials
Nom court de la revue :
Microporous and Mesoporous Materials
Numéro :
289
Pagination :
109617
Éditeur :
Elsevier BV
Date de publication :
2019-11
ISSN :
1387-1811
Mot(s)-clé(s) en anglais :
Radical coke
Zeolite
EPR
Microporous materials
MALDI-TOF
Zeolite
EPR
Microporous materials
MALDI-TOF
Discipline(s) HAL :
Chimie/Chimie théorique et/ou physique
Résumé en anglais : [en]
The formation and the trapping of heavy secondary products called “coke” within the pores (cages, channels) was studied during the ethanol transformation according to different topologies of zeolites: MFI, *BEA and FAU. ...
Lire la suite >The formation and the trapping of heavy secondary products called “coke” within the pores (cages, channels) was studied during the ethanol transformation according to different topologies of zeolites: MFI, *BEA and FAU. The aim of this contribution is to (i) assess the possibilities of the electron paramagnetic resonance (EPR) spectroscopy to provide structural information on radical coke compounds and (ii) to show the relationship between the zeolite structure (pore size) and the internal coke nature (components size). In this work, EPR spectroscopy allowed to characterize quantitatively and qualitatively the radical coke molecules and give information about local chemical environment of unpaired electron and radical concentration while mass spectroscopies (MALDI-TOF and GC-MS) provide information about the molecular structure of internal soluble coke. It is shown that FAU zeolite which possesses super-cages contains in its micropores the most voluminous radical coke molecules such as coronene. While *BEA and MFI zeolites contains less heavy radical coke molecules in their micropores such as pyrene and naphthalene respectively.Lire moins >
Lire la suite >The formation and the trapping of heavy secondary products called “coke” within the pores (cages, channels) was studied during the ethanol transformation according to different topologies of zeolites: MFI, *BEA and FAU. The aim of this contribution is to (i) assess the possibilities of the electron paramagnetic resonance (EPR) spectroscopy to provide structural information on radical coke compounds and (ii) to show the relationship between the zeolite structure (pore size) and the internal coke nature (components size). In this work, EPR spectroscopy allowed to characterize quantitatively and qualitatively the radical coke molecules and give information about local chemical environment of unpaired electron and radical concentration while mass spectroscopies (MALDI-TOF and GC-MS) provide information about the molecular structure of internal soluble coke. It is shown that FAU zeolite which possesses super-cages contains in its micropores the most voluminous radical coke molecules such as coronene. While *BEA and MFI zeolites contains less heavy radical coke molecules in their micropores such as pyrene and naphthalene respectively.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Équipe(s) de recherche :
Propriétés magnéto structurales des matériaux (PMSM)
Date de dépôt :
2021-06-17T13:08:46Z
2021-06-28T11:49:37Z
2021-06-28T11:49:37Z
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