NickelMaghrebV1, Main, Exploration, bibRecord, 000367

Benzene hydrogenation over Ni-Cu/SiO2 catalysts prepared by aqueous hydrazine reduction

Identifieur interne : 000367 ( Main/Exploration ); précédent : 000366; suivant : 000368

Benzene hydrogenation over Ni-Cu/SiO2 catalysts prepared by aqueous hydrazine reduction

Auteurs : Abdel-Ghani Boudjahem [Algérie] ; Wissam Bouderbala [Algérie] ; Mohammed Bettahar [France]

Source :

Fuel processing technology [ 0378-3820 ] ; 2011.

RBID : Pascal:11-0104074

Descripteurs français

Pascal (Inist)
- Benzène, Hydrogénation, Nickel, Catalyseur sur support, Hydrazine, Cuivre, Silice, Acétate, Microscopie électronique transmission, Adsorption, Densité, Dimension particule, Changement phase, Modèle cinétique, Mécanisme réaction, Etude comparative, Propriété surface.
Wicri :
- topic : Nickel, Cuivre.

English descriptors

KwdEn :
- Acetate, Adsorption, Benzene, Comparative study, Copper, Density, Hydrazine, Hydrogenation, Kinetic model, Nickel, Particle size, Phase change, Reaction mechanism, Silica, Supported catalyst, Surface properties, Transmission electron microscopy.

Abstract

Non conventional nickel (1%) and nickel (1%)-copper (0.2%-0.75%) catalysts supported on silica have been prepared by aqueous hydrazine reduction of nickel acetate at 70 °C. They were characterized by TEM, H₂-adsorption, H₂-TPD and tested in the gas phase hydrogenation of benzene at atmospheric pressure in the temperature range 75 °C-230 °C. The obtained results show that nickel is in a whisker-like shape or as a film of low density for the Ni/SiO₂ and Ni-Cu/SiO₂ catalysts respectively. Copper is in the shape of facetted particles in the mono or bimetallic systems with a mean particle size varying from 25 to 100 nm. The presence of copper decreased the nickel phase dispersion as well as the conversion whereas it increased carbon deposit in benzene hydrogenation. The results obtained are ascribed to nickel phase shape changes and Ni-Cu interactions. A kinetic reaction mechanism model is proposed. The comparative study of a pair of classical/ non-classical Ni/SiO₂ catalysts showed much higher surface and catalytic properties of the hydrazine catalyst. .

Affiliations:

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Le document en format XML

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 catalysts prepared by aqueous hydrazine reduction</title>
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 catalysts prepared by aqueous hydrazine reduction</title>
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<term>Adsorption</term>
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<term>Comparative study</term>
<term>Copper</term>
<term>Density</term>
<term>Hydrazine</term>
<term>Hydrogenation</term>
<term>Kinetic model</term>
<term>Nickel</term>
<term>Particle size</term>
<term>Phase change</term>
<term>Reaction mechanism</term>
<term>Silica</term>
<term>Supported catalyst</term>
<term>Surface properties</term>
<term>Transmission electron microscopy</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Benzène</term>
<term>Hydrogénation</term>
<term>Nickel</term>
<term>Catalyseur sur support</term>
<term>Hydrazine</term>
<term>Cuivre</term>
<term>Silice</term>
<term>Acétate</term>
<term>Microscopie électronique transmission</term>
<term>Adsorption</term>
<term>Densité</term>
<term>Dimension particule</term>
<term>Changement phase</term>
<term>Modèle cinétique</term>
<term>Mécanisme réaction</term>
<term>Etude comparative</term>
<term>Propriété surface</term>
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<term>Cuivre</term>
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<front><div type="abstract" xml:lang="en">Non conventional nickel (1%) and nickel (1%)-copper (0.2%-0.75%) catalysts supported on silica have been prepared by aqueous hydrazine reduction of nickel acetate at 70 °C. They were characterized by TEM, H<sub>2</sub>
-adsorption, H<sub>2</sub>
-TPD and tested in the gas phase hydrogenation of benzene at atmospheric pressure in the temperature range 75 °C-230 °C. The obtained results show that nickel is in a whisker-like shape or as a film of low density for the Ni/SiO<sub>2</sub>
 and Ni-Cu/SiO<sub>2</sub>
 catalysts respectively. Copper is in the shape of facetted particles in the mono or bimetallic systems with a mean particle size varying from 25 to 100 nm. The presence of copper decreased the nickel phase dispersion as well as the conversion whereas it increased carbon deposit in benzene hydrogenation. The results obtained are ascribed to nickel phase shape changes and Ni-Cu interactions. A kinetic reaction mechanism model is proposed. The comparative study of a pair of classical/ non-classical Ni/SiO<sub>2</sub>
 catalysts showed much higher surface and catalytic properties of the hydrazine catalyst. .</div>
</front>
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<country name="France"><region name="Grand Est"><name sortKey="Bettahar, Mohammed" sort="Bettahar, Mohammed" uniqKey="Bettahar M" first="Mohammed" last="Bettahar">Mohammed Bettahar</name>
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Benzene hydrogenation over Ni-Cu/SiO2 catalysts prepared by aqueous hydrazine reduction

Benzene hydrogenation over Ni-Cu/SiO2 catalysts prepared by aqueous hydrazine reduction

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri