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Coupling sol-gel synthesis and microwave-assisted techniques: a new route from amorphous to crystalline high-surface-area aluminium fluoride

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDAMBOURNET, Damien
hal.structure.identifierInstitut für Chemie
dc.contributor.authorELTANAMY, Gehan
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorVIMONT, Alexandre
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorLAVALLEY, Jean-Claude
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorGOUPIL, Jean-Michel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMOURGUES, Alain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDURAND, Etienne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMAJIMEL, Jérôme
hal.structure.identifierInstitut für Chemie
dc.contributor.authorRUDIGER, Stephan
hal.structure.identifierInstitut für Chemie
dc.contributor.authorKEMNITZ, Erhard
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorWINFIELD, John M.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTRESSAUD, Alain
dc.date.issued2008
dc.identifier.issn0947-6539
dc.description.abstractEnA non-aqueous sol-gel Al-based fluoride has been subjected to the microwave solvothermal process. The final material depends on the temperature heat treatment used. Three types of material have been prepared: 1) for low temperature heat treatment (90 °C) X-ray amorphous alkoxy fluoride was obtained; 2) for the highest temperature used (200 °C) the metastable form -AlF3 was obtained with a very large surface area of 125 m2 g-1. The mechanism of the amorphouscrystalline transformation has been rationalised by the occurrence of a decomposition reaction of the gel fluoride induced by the microwave irradiation. 3) Finally, at intermediate temperature (180 °C) a multi-component material mixture exhibiting a huge surface area of 525 m2 g-1 has been obtained and further investigated after mild post-treatment fluorination using F2 gas. The resulting aluminium-based fluoride still possesses a high-surface-area of 330 m2 g-1. HRTEM revealed that the solid is built from large particles (50 nm) identified as -AlF3, and small ones (10 nm), relative to an unidentified phase. This new high-surface-area material exhibits strong Lewis acidity as revealed by pyridine adsorption and catalytic tests. By comparison with other materials, it has been shown that whatever the composition/structure of the Al-based fluoride materials, the number of strong Lewis acid sites is related to the surface area, highlighting the role of surface reconstruction occurring on a nanoscopic scale on the formation of the strongest Lewis acid sites.
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enFluorides
dc.subject.enHigh surface area
dc.subject.enLewis acids
dc.subject.enMicrowave solvothermal processes
dc.subject.enNanostructures
dc.subject.enSol-gel processes
dc.title.enCoupling sol-gel synthesis and microwave-assisted techniques: a new route from amorphous to crystalline high-surface-area aluminium fluoride
dc.typeArticle de revue
dc.identifier.doi10.1002/chem.200701831
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry - A European Journal
bordeaux.page6205-6212
bordeaux.volume14
bordeaux.issue20
bordeaux.peerReviewedoui
hal.identifierhal-00294226
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00294226v1
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