NickelMaghrebV1, Main, Exploration, bibRecord, 000712

Ni-Ce intermetallic phases in CeO2-supported nickel catalysts synthesized by γ-radiolysis

Identifieur interne : 000712 ( Main/Exploration ); précédent : 000711; suivant : 000713

Ni-Ce intermetallic phases in CeO2-supported nickel catalysts synthesized by γ-radiolysis

Auteurs : S. Chettibi [Algérie] ; R. Wojcieszak [France] ; E. H. Boudjennad [Algérie] ; J. Belloni [France] ; M. M. Bettahar [France] ; N. Keghouche [Algérie]

Source :

Catalysis today [ 0920-5861 ] ; 2006.

RBID : Pascal:06-0371420

Descripteurs français

Pascal (Inist)
- Lanthanide composé, Cérium oxyde, Catalyseur sur support, Catalyse hétérogène, Support catalyseur, Nickel, Radiolyse, Benzène, Hydrogénation.
Wicri :
- topic : Nickel.

English descriptors

KwdEn :
- Benzene, Catalyst support, Cerium oxide, Heterogeneous catalysis, Hydrogenation, Lanthanide compound, Nickel, Radiolysis, Supported catalyst.

Abstract

This work concerns the study of nickel clusters synthesized by radiation-induced reduction of Ni²⁺ ions previously adsorbed on ceria by ionic exchange in the aim to test their performance in catalytic hydrogenation. The nickel catalyst and CeO₂ support were characterized by SEM coupled to X analysis, XRD, H₂-adsorption and H-TPD. The catalyst prepared by irradiation presents high reducibility, dispersion and homogeneity of the metal phase. It is shown that the CeO₂ support stores hydrogen during the radiolytic reduction of Ni ions and that the adsorbed hydrogen amounts strongly increase in the presence of nickel. The catalyst displays high catalytic performance in the benzene hydrogenation reaction (total conversion in a large and low temperature range). These properties are assigned to the high dispersion of nickel and to the promoter role of the support: actually, after the catalytic test, intermetallic nickel-cerium compounds (CeNi and CeNi₂) are detected in the sample in addition to the Ni° phase.

Affiliations:

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Benzene</term>
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<term>Heterogeneous catalysis</term>
<term>Hydrogenation</term>
<term>Lanthanide compound</term>
<term>Nickel</term>
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<front><div type="abstract" xml:lang="en">This work concerns the study of nickel clusters synthesized by radiation-induced reduction of Ni<sup>2+</sup>
 ions previously adsorbed on ceria by ionic exchange in the aim to test their performance in catalytic hydrogenation. The nickel catalyst and CeO<sub>2</sub>
 support were characterized by SEM coupled to X analysis, XRD, H<sub>2</sub>
-adsorption and H-TPD. The catalyst prepared by irradiation presents high reducibility, dispersion and homogeneity of the metal phase. It is shown that the CeO<sub>2</sub>
 support stores hydrogen during the radiolytic reduction of Ni ions and that the adsorbed hydrogen amounts strongly increase in the presence of nickel. The catalyst displays high catalytic performance in the benzene hydrogenation reaction (total conversion in a large and low temperature range). These properties are assigned to the high dispersion of nickel and to the promoter role of the support: actually, after the catalytic test, intermetallic nickel-cerium compounds (CeNi and CeNi<sub>2</sub>
) are detected in the sample in addition to the Ni° phase.</div>
</front>
</TEI>
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Ni-Ce intermetallic phases in CeO2-supported nickel catalysts synthesized by γ-radiolysis

Ni-Ce intermetallic phases in CeO2-supported nickel catalysts synthesized by γ-radiolysis

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