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Design de nouveaux catalyseurs par incorporation d'hétéropolyanion dans une matrice mésostructurée

Abstract : This study deals with the development of new hydrotreatment (HDT) and hydrocracking (HCK) catalysts by use of sol-gel chemistry coupled with the spray drying process. Synthesized materials are silica and aluminosilica (molar ratio Si/Al = 12) with mesostructured porosity. An oxometallic phase composed of molybdenum and cobalt is incorporate in the catalysts. Syntheses were carried out in presence of inorganic precursors (tétraéthylorthosilicate and aluminium chloride), with Pluronic P123 surfactant ([EO]30-[PO]70-[EO]30), with molybdenum based heteropolyanions (HPA), with Keggin structure ([PMo12O40]3-) or Strandberg structure ([P2Mo5O23]6-), and eventually with cobalt hydroxide (Co(OH)2). The amount of molybdenum, the nature of the HPA initially used and the calcination temperature are key parameters of the structuration of the materials. Thus, the study of the textural and structural properties of the matrix by nitrogen adsorption-desoprtion, SAXS, TEM as well as the study of the oxometallic phase by NMR 31P, FTIR and Raman, permits to put forward a structural model of the catalysts. The structure, the dispersion and the localization of the oxometallic phase within the matrix is also discussed in detail. Sulfided materials have been studied by TEM and XPS, whereas the catalytic performances of toluene hydrogenation have been tested. The catalytic activity of the materials depends on the morphology of the sulfided phase, the one depends on the localization of the oxometallic phase in the mesostructured matrix
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  • HAL Id : tel-00828469, version 1


Frédéric Colbeau-Justin. Design de nouveaux catalyseurs par incorporation d'hétéropolyanion dans une matrice mésostructurée. Science des matériaux [cond-mat.mtrl-sci]. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨NNT : 2012PAO66372⟩. ⟨tel-00828469⟩



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