CobaltMaghrebV1, Main, Exploration, bibRecord, 000A12

Effect of MgO additive on catalytic properties of Co/SiO2 in the dry reforming of methane

Identifieur interne : 000A12 ( Main/Exploration ); précédent : 000A11; suivant : 000A13

Effect of MgO additive on catalytic properties of Co/SiO2 in the dry reforming of methane

Auteurs : R. Bouarab [Algérie, France] ; O. Akdim [France] ; A. Auroux [France] ; O. Cherifi [Algérie] ; C. Mirodatos [France]

Source :

Applied catalysis. A, General [ 0926-860X ] ; 2004.

RBID : Pascal:04-0286998

Descripteurs français

Pascal (Inist)
- Additif, Réaction catalytique, Silice, Reformage, Méthane, Gaz synthèse, Catalyseur, Silicate.

English descriptors

KwdEn :
- Additive, Catalyst, Catalytic reaction, Methane, Reforming, Silica, Silicates, Synthesis gas.

Abstract

The dry reforming of methane to syngas was studied in the temperature range 500-800 °C on a series of Co/SiO₂ catalysts modified by MgO (5-35 wt.%). The materials have been prepared by successive incipient wetness impregnation and characterised by BET, XRD, H2-TPR, CO₂ adsorption and in situ-DRIFT. The formation of a silicate adlayer Mg₂SiO₄ is observed at high MgO content (30-35 wt.%), which corresponds to a much improved catalytic stability under the severe dry reforming conditions. This phase favours the development of small metallic cobalt particles, preventing their coalescence under reaction conditions. A bi-functional mechanism is proposed which combines the accumulation of oxidizing agents like carbonates and hydrogeno-carbonate adspecies on the catalyst support due to a medium basicity of the layer and the reactivity of small metal particles for methane activation. This concerted process tends to limit coke formation and therefore contribute to the observed catalytic stability.

Affiliations:

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Additive</term>
<term>Catalyst</term>
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<term>Methane</term>
<term>Reforming</term>
<term>Silica</term>
<term>Silicates</term>
<term>Synthesis gas</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Additif</term>
<term>Réaction catalytique</term>
<term>Silice</term>
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<term>Catalyseur</term>
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<front><div type="abstract" xml:lang="en">The dry reforming of methane to syngas was studied in the temperature range 500-800 °C on a series of Co/SiO<sub>2</sub>
 catalysts modified by MgO (5-35 wt.%). The materials have been prepared by successive incipient wetness impregnation and characterised by BET, XRD, H2-TPR, CO<sub>2</sub>
 adsorption and in situ-DRIFT. The formation of a silicate adlayer Mg<sub>2</sub>
SiO<sub>4</sub>
 is observed at high MgO content (30-35 wt.%), which corresponds to a much improved catalytic stability under the severe dry reforming conditions. This phase favours the development of small metallic cobalt particles, preventing their coalescence under reaction conditions. A bi-functional mechanism is proposed which combines the accumulation of oxidizing agents like carbonates and hydrogeno-carbonate adspecies on the catalyst support due to a medium basicity of the layer and the reactivity of small metal particles for methane activation. This concerted process tends to limit coke formation and therefore contribute to the observed catalytic stability.</div>
</front>
</TEI>
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Effect of MgO additive on catalytic properties of Co/SiO2 in the dry reforming of methane

Effect of MgO additive on catalytic properties of Co/SiO2 in the dry reforming of methane

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