New catalytic systems based on carbon nanotubes supported ionic liquid phase / Laura Rodriguez Perez  

Public ISBD Titre : New catalytic systems based on carbon nanotubes supported ionic liquid phase Type de document : texte imprimé Auteurs : Laura Rodriguez Perez, Auteur ; GOMEZ, Montserrat, Directeur de la recherche ; Philippe Serp, Directeur de thèse Langues : Anglais (eng) Tags : IONIC LIQUID  MULTI-WALLED CARBON NANOTUBES  SUPPORTED IONIC LIQUID PHASE CATALYSIS  COMPLEXES  RHODIUM  NANOPARTICLES  PALLADIUM  HYDROGENATION  C-C HECK COUPLING  SEQUENTIAL REACTIONS Résumé : "As catalytic support, carbon nanotubes present an open macrostructure with large mesoporosity which avoids mass transfer limitations. Ionic Liquids (ILs) have received much attention in the past years due to their importance in a broad range of applications. In catalysis, they are used to immobilize the catalyst in biphasic reactions and enable an easy separation. Their ionic character confers to these media a special organization of several nanometers that induces solvation phenomena and specific reactivity that can be linked either to confinement effects in the organized structure or to molecular interactions. However, these solvents remain expensive and the fact to support them onto carbon nanotubes as a thin film should permit to reduce significantly the volumes used. In this PhD thesis in order to prepare carbon nanotubes-IL hybrid materials, multi-walled carbon nanotubes were covalently modified with imidazolium salt-based moieties. This functionalization allowed specific interactions between the IL thin film and the chemical moieties on the MWCNTs surface. Then, the catalyst (rhodium complex or palladium nanoparticles) was immobilized into the IL thin film. The catalytic performances have been evaluated in bench reactions: hydrogenation of 1-hexene for rhodium, and selective hydrogenation, Heck, and sequential Heck/hydrogentation process for palladium. Finally, a comparative study has been performed between carbon nanotubes and other classical mesoporous oxide supports, including silica. The carbon nanotubes based catalyst present better performances than their counterparts prepared on conventional supports. Additionally, composites based on SiO2/IL or Al2O3/IL were prepared to carry out a structural study with the aim of understanding their specific surface interactions and compare them to pure ionic liquid." Document : Thèse de Doctorat Etablissement_delivrance : Institut National Polytechnique de Toulouse - INPT Date_soutenance : 14/12/2009 Ecole_doctorale : Sciences de la Matière (SdM) (Toulouse) Domaine : Chimie Organométallique et de Coordination En ligne : https://theses.hal.science/tel-04400818v1 New catalytic systems based on carbon nanotubes supported ionic liquid phase [texte imprimé] / Laura Rodriguez Perez, Auteur ; GOMEZ, Montserrat, Directeur de la recherche ; Philippe Serp, Directeur de thèse . - [s.d.]. Langues : Anglais (eng) Tags : IONIC LIQUID  MULTI-WALLED CARBON NANOTUBES  SUPPORTED IONIC LIQUID PHASE CATALYSIS  COMPLEXES  RHODIUM  NANOPARTICLES  PALLADIUM  HYDROGENATION  C-C HECK COUPLING  SEQUENTIAL REACTIONS Résumé : "As catalytic support, carbon nanotubes present an open macrostructure with large mesoporosity which avoids mass transfer limitations. Ionic Liquids (ILs) have received much attention in the past years due to their importance in a broad range of applications. In catalysis, they are used to immobilize the catalyst in biphasic reactions and enable an easy separation. Their ionic character confers to these media a special organization of several nanometers that induces solvation phenomena and specific reactivity that can be linked either to confinement effects in the organized structure or to molecular interactions. However, these solvents remain expensive and the fact to support them onto carbon nanotubes as a thin film should permit to reduce significantly the volumes used. In this PhD thesis in order to prepare carbon nanotubes-IL hybrid materials, multi-walled carbon nanotubes were covalently modified with imidazolium salt-based moieties. This functionalization allowed specific interactions between the IL thin film and the chemical moieties on the MWCNTs surface. Then, the catalyst (rhodium complex or palladium nanoparticles) was immobilized into the IL thin film. The catalytic performances have been evaluated in bench reactions: hydrogenation of 1-hexene for rhodium, and selective hydrogenation, Heck, and sequential Heck/hydrogentation process for palladium. Finally, a comparative study has been performed between carbon nanotubes and other classical mesoporous oxide supports, including silica. The carbon nanotubes based catalyst present better performances than their counterparts prepared on conventional supports. Additionally, composites based on SiO2/IL or Al2O3/IL were prepared to carry out a structural study with the aim of understanding their specific surface interactions and compare them to pure ionic liquid." Document : Thèse de Doctorat Etablissement_delivrance : Institut National Polytechnique de Toulouse - INPT Date_soutenance : 14/12/2009 Ecole_doctorale : Sciences de la Matière (SdM) (Toulouse) Domaine : Chimie Organométallique et de Coordination En ligne : https://theses.hal.science/tel-04400818v1

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