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Structural investigations and acidic properties of high surface area pyrochlore aluminium hydroxyfluoride

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDAMBOURNET, Damien
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMOURGUES, Alain
hal.structure.identifierLaboratoire des oxydes et fluorures [LdOF ]
hal.structure.identifierInstitut de recherche en ingénierie moléculaire et matériaux fonctionnels de l'université du Maine [IRIMMFUM]
dc.contributor.authorMARTINEAU, Charlotte
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.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorVIMONT, Alexandre
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorLECLERC, Hervé
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorLAVALLEY, Jean-Claude
hal.structure.identifierLaboratoire catalyse et spectrochimie [LCS]
dc.contributor.authorDATURI, Marco
hal.structure.identifierLaboratoire des oxydes et fluorures [LdOF ]
hal.structure.identifierInstitut de recherche en ingénierie moléculaire et matériaux fonctionnels de l'université du Maine [IRIMMFUM]
dc.contributor.authorLEGEIN, Christophe
hal.structure.identifierInstitut de recherche en ingénierie moléculaire et matériaux fonctionnels de l'université du Maine [IRIMMFUM]
hal.structure.identifierLaboratoire de physique de l'état condensé [LPEC]
dc.contributor.authorBUZARÉ, Jean-Yves
hal.structure.identifierCentre de recherches sur les matériaux à haute température [CRMHT]
dc.contributor.authorFAYON, Franck
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTRESSAUD, Alain
dc.date.issued2008
dc.identifier.issn0959-9428
dc.description.abstractEnHigh surface area aluminium hydroxyfluoride exhibiting the pyrochlore-type structure has been synthesized using microwave hydrothermal process. The optimization of the crystallite size and surface area of the material has been performed by varying some synthesis parameters, i.e. the nature of the aluminium precursor, the choice of solvents and the addition of a small amount of ether. The as-prepared solid contains nanosized particles as calculated by XRD (average particle size: 12 nm) leading to a surface area around 140 m2 g-1. These results have been confirmed by TEM observations. The framework is built of AlF6-x(OH)x species which have been characterized and quantified by high field 27Al NMR. A random distribution of F atoms and OH groups is evidenced to occur on the 48f sites. Inside the channels, water molecules interact with the framework by hydrogen bonding either with fluoride ions or OH groups present in their vicinity. The use of probe molecules has shown that the pyrochlore exhibits a Lewis acidity lying between that of -Al2O3 and that of the strong Lewis acid -AlF3 adopting the hexagonal tungsten bronze form. Surface OH groups have been characterized by IR spectroscopy and exhibit weak Brønsted acidity.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enHydroxyfluorides
dc.subject.enAluminium
dc.subject.enAcidic properties
dc.subject.enPyrochlore
dc.subject.enMicrowave hydrothermal process
dc.subject.enSurface
dc.subject.enCrystal structure
dc.title.enStructural investigations and acidic properties of high surface area pyrochlore aluminium hydroxyfluoride
dc.typeArticle de revue
dc.identifier.doi10.1039/b718856k
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry
bordeaux.page2483-2492
bordeaux.volume18
bordeaux.issue21
bordeaux.peerReviewedoui
hal.identifierhal-00295569
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00295569v1
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