NickelMaghrebV1, France, Analysis, bibRecord, 000217

Characterization and activity in dry reforming of methane on NiMg/Al and Ni/MgO catalysts

Identifieur interne : 000217 ( France/Analysis ); précédent : 000216; suivant : 000218

Characterization and activity in dry reforming of methane on NiMg/Al and Ni/MgO catalysts

Auteurs : A. Djaidja [Algérie, France] ; S. Libs [France] ; A. Kiennemann [France] ; A. Barama [Algérie]

Source :

Catalysis today [ 0920-5861 ] ; 2006.

RBID : Pascal:06-0371426

Descripteurs français

Pascal (Inist)
- Caractérisation, Reformage, Méthane, Magnésium oxyde, Catalyseur, Gaz synthèse, Nickel, Oxyde, Dépôt coke, Catalyse hétérogène, Aluminium Oxyde.
Wicri :
- topic : Nickel, Oxyde.

English descriptors

KwdEn :
- Aluminium Oxides, Catalyst, Characterization, Coke deposition, Heterogeneous catalysis, Magnesium oxide, Methane, Nickel, Oxides, Reforming, Synthesis gas.

Abstract

Dry reforming of methane has been investigated on two series of catalysts either prepared by co-precipitation: n(Ni_xMg_y)/Al, Ni_xMg_y and Ni_xAl_y or prepared by impregnation: Ni/MgO (mol% Ni = 5, 10). The catalysts, calcined at 600-900 °C, were characterized by different techniques: BET, H₂-TPR, TPO, XRD, IR, and TEM-EDX analysis. The surface BET (30-182 m² g^-1) decreased with increasing the temperature of calcination, after reduction and in the presence of Mg element. The XRD analysis showed, for n(Ni_xMg_y)/Al catalysts, the presence of NiAl₂O₄ and NiO-MgO solid solutions. The catalyst reducibility decreased with increasing the temperature of pretreatment. The n(Ni_xMg_y)/Al catalysts were active for dry reforming of methane with a good resistance to coke formation. The bimetallic catalyst Ni_0.05Mg_0.95 (calcined at 750 °C and tested at 800 C) presents a poor activity. In contrast, the 5% Ni/MgO catalyst, having the same composition but prepared by impregnation, presents a high activity for the same calcination and reaction conditions. For all the catalysts the activity decreased with increasing the temperature of calcination and a previous H₂-reduction of the catalyst improves the performances. The TPO profiles and TEM-EDX analysis showed mainly four types of coke: CH, species, surface carbon, nickel carbide and carbon nanotubes.

Affiliations:

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Le document en format XML

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<author><name sortKey="Kiennemann, A" sort="Kiennemann, A" uniqKey="Kiennemann A" first="A." last="Kiennemann">A. Kiennemann</name>
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<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Gaz Nnaturel, Faculté de Chimie, USTHB BP.32.El-Alia</s1>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aluminium Oxides</term>
<term>Catalyst</term>
<term>Characterization</term>
<term>Coke deposition</term>
<term>Heterogeneous catalysis</term>
<term>Magnesium oxide</term>
<term>Methane</term>
<term>Nickel</term>
<term>Oxides</term>
<term>Reforming</term>
<term>Synthesis gas</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Caractérisation</term>
<term>Reformage</term>
<term>Méthane</term>
<term>Magnésium oxyde</term>
<term>Catalyseur</term>
<term>Gaz synthèse</term>
<term>Nickel</term>
<term>Oxyde</term>
<term>Dépôt coke</term>
<term>Catalyse hétérogène</term>
<term>Aluminium Oxyde</term>
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<term>Oxyde</term>
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<front><div type="abstract" xml:lang="en">Dry reforming of methane has been investigated on two series of catalysts either prepared by co-precipitation: n(Ni<sub>x</sub>
Mg<sub>y</sub>
)/Al, Ni<sub>x</sub>
Mg<sub>y</sub>
 and Ni<sub>x</sub>
Al<sub>y</sub>
 or prepared by impregnation: Ni/MgO (mol% Ni = 5, 10). The catalysts, calcined at 600-900 °C, were characterized by different techniques: BET, H<sub>2</sub>
-TPR, TPO, XRD, IR, and TEM-EDX analysis. The surface BET (30-182 m<sup>2</sup>
 g<sup>-1</sup>
) decreased with increasing the temperature of calcination, after reduction and in the presence of Mg element. The XRD analysis showed, for n(Ni<sub>x</sub>
Mg<sub>y</sub>
)/Al catalysts, the presence of NiAl<sub>2</sub>
O<sub>4</sub>
 and NiO-MgO solid solutions. The catalyst reducibility decreased with increasing the temperature of pretreatment. The n(Ni<sub>x</sub>
Mg<sub>y</sub>
)/Al catalysts were active for dry reforming of methane with a good resistance to coke formation. The bimetallic catalyst Ni<sub>0.05</sub>
Mg<sub>0.95</sub>
 (calcined at 750 °C and tested at 800 C) presents a poor activity. In contrast, the 5% Ni/MgO catalyst, having the same composition but prepared by impregnation, presents a high activity for the same calcination and reaction conditions. For all the catalysts the activity decreased with increasing the temperature of calcination and a previous H<sub>2</sub>
-reduction of the catalyst improves the performances. The TPO profiles and TEM-EDX analysis showed mainly four types of coke: CH, species, surface carbon, nickel carbide and carbon nanotubes.</div>
</front>
</TEI>
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<name sortKey="Barama, A" sort="Barama, A" uniqKey="Barama A" first="A." last="Barama">A. Barama</name>
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<country name="France"><region name="Grand Est"><name sortKey="Djaidja, A" sort="Djaidja, A" uniqKey="Djaidja A" first="A." last="Djaidja">A. Djaidja</name>
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Characterization and activity in dry reforming of methane on NiMg/Al and Ni/MgO catalysts

Characterization and activity in dry reforming of methane on NiMg/Al and Ni/MgO catalysts

Source :

Descripteurs français

English descriptors

Abstract

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