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Adsorption du Nickel sur les oxydes métalliques.

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dc.contributor.author Ouafek, Nora
dc.contributor.author Keghouche, Nassira
dc.date.accessioned 2022-05-25T09:07:53Z
dc.date.available 2022-05-25T09:07:53Z
dc.date.issued 2007-02-02
dc.identifier.uri http://depot.umc.edu.dz/handle/123456789/9676
dc.description 84 f.
dc.description.abstract This work studies the nickel anchored on several oxides, in the aim to be used as benzene hydrogenation catalyst. The metal ions, adsorbed on the oxide surface, are reduced under ? radiation in aqueous solution. The radiolytic way has been proven to be powerful tool for obtaining dispersed nanoparticules in colloidal state, deposited on a solid support or in heterogeneous state. This process makes it possible to control the size of the particles, their localization on the surface or into volume. In the dispersed systems, the surface phenomena play an impotant role. The adsorption of ions or molecules on the surface of the aggregates can modify their properties and improve their activity. This is why we paid attention to the step of nickel adsorption on the oxides by looking for the optimal condition in order to obtain an electrostatic interaction between the metal ions and the surface of the support, favorable to a homogeneous and durable nickel dispersion. This step was followed by UV- visible spectrophotometry and pH- metry. In the second step, the irradiated samples are characterized by various technics (MEB, analyzes X and XRD). For the MgO support, Mg2Ni phases and Ni2Mg of nanometric size were evidenced. These intermetallic compounds are of first importance in the energy field. The nanoparticules of Ni/ZrO2 tested in catalysis in the benzene hydrogenation reaction exhibit good catalytic properties. They are more active in decreasing temperature than in increasing ones, indicating an anhencement of the catalytic activity during working.
dc.language.iso fr
dc.publisher Université Frères Mentouri - Constantine 1
dc.subject Physique
dc.subject Sciences des matériaux : métallurgie
dc.subject Nanoparticules
dc.subject Catalyseurs
dc.subject Ni2Mg
dc.subject Mg2Ni
dc.subject Ni/Oxydes
dc.subject Radiolyse
dc.subject Hydrogénation du benzène
dc.subject Catalysts
dc.subject Radiolysis
dc.subject Benzene hydrogenation
dc.title Adsorption du Nickel sur les oxydes métalliques.
dc.type Thesis
dc.coverage 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD


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