NickelMaghrebV1, Main, Exploration, bibRecord, 000649

Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite

Identifieur interne : 000649 ( Main/Exploration ); précédent : 000648; suivant : 000650

Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite

Auteurs : Zouhair Boukha [Maroc, Portugal] ; Mohamed Kacimi [Maroc] ; Manuel Fernando R. Pereira [Portugal] ; Joaquim L. Faria [Portugal] ; José Luis Figueiredo [Portugal] ; Mahfoud Ziyad [Maroc]

Source :

Applied catalysis. A, General [ 0926-860X ] ; 2007.

RBID : Pascal:07-0179007

Descripteurs français

Pascal (Inist)
- Méthane, Reformage, Apatite hydroxylée, Apatite halogénée, Calcium, Diffraction RX, Spectrométrie photoélectron, Rayon X, Catalyse hétérogène.
Wicri :
- topic : Calcium.

English descriptors

KwdEn :
- Calcium, Halogenapatite, Heterogeneous catalysis, Hydroxyapatite, Methane, Photoelectron spectrometry, Reforming, X ray, X ray diffraction.

Abstract

Calcium-hydroxyapatite and calcium-fluoroapatite loaded with different amounts of nickel were synthesized and characterized by several techniques including scanning electron microscopy, temperature programmed reduction (TPR), UV-visible-NIR and XPS spectroscopy. Three types of nickel species were detected in the two series of catalysts (i) Ni²⁺ ions exchanged with Ca²⁺ ions of the apatite framework. This Ni²⁺/Ca²⁺ exchange seems to be restricted to nickel loadings inferior to 1 wt% Ni, (ii) small particles of NiO exhibiting strong interactions with the carriers (for x > 1 wt% Ni) and (iii) large particles of NiO which appear at high loadings. The distribution of the nickel between these three hosting sites depends on the nature of the apatite. For instance the amount of exchanged Ni²⁺ ions in Ni(1)/CaHAp is twice more important than in Ni(1)/CaFAp. The Ni(x)/CaHAp and Ni(x)/CaFAp catalysts were tested in methane dry reforming with CO₂. Methane conversion at 600 °C, increases with the nickel loading up to x = 4 where the activity is around the thermodynamic equilibrium (78%) and H₂/CO ratio close to 1. These results were confirmed by the investigation of the catalysts activity versus the temperature. Carbon deposition on the catalysts was found to also increase with nickel loading but without provoking any significant decay of the activity after 4 h on stream. The encouraging results achieved were attributed to the synergy between the basic properties of the apatites, their aptitude to chemisorb CO₂ and the catalytic features of the supported nickel.

Affiliations:

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Calcium</term>
<term>Halogenapatite</term>
<term>Heterogeneous catalysis</term>
<term>Hydroxyapatite</term>
<term>Methane</term>
<term>Photoelectron spectrometry</term>
<term>Reforming</term>
<term>X ray</term>
<term>X ray diffraction</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Méthane</term>
<term>Reformage</term>
<term>Apatite hydroxylée</term>
<term>Apatite halogénée</term>
<term>Calcium</term>
<term>Diffraction RX</term>
<term>Spectrométrie photoélectron</term>
<term>Rayon X</term>
<term>Catalyse hétérogène</term>
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<front><div type="abstract" xml:lang="en">Calcium-hydroxyapatite and calcium-fluoroapatite loaded with different amounts of nickel were synthesized and characterized by several techniques including scanning electron microscopy, temperature programmed reduction (TPR), UV-visible-NIR and XPS spectroscopy. Three types of nickel species were detected in the two series of catalysts (i) Ni<sup>2+</sup>
 ions exchanged with Ca<sup>2+</sup>
 ions of the apatite framework. This Ni<sup>2+</sup>
/Ca<sup>2+</sup>
 exchange seems to be restricted to nickel loadings inferior to 1 wt% Ni, (ii) small particles of NiO exhibiting strong interactions with the carriers (for x > 1 wt% Ni) and (iii) large particles of NiO which appear at high loadings. The distribution of the nickel between these three hosting sites depends on the nature of the apatite. For instance the amount of exchanged Ni<sup>2+</sup>
 ions in Ni(1)/CaHAp is twice more important than in Ni(1)/CaFAp. The Ni(x)/CaHAp and Ni(x)/CaFAp catalysts were tested in methane dry reforming with CO<sub>2</sub>
. Methane conversion at 600 °C, increases with the nickel loading up to x = 4 where the activity is around the thermodynamic equilibrium (78%) and H<sub>2</sub>
/CO ratio close to 1. These results were confirmed by the investigation of the catalysts activity versus the temperature. Carbon deposition on the catalysts was found to also increase with nickel loading but without provoking any significant decay of the activity after 4 h on stream. The encouraging results achieved were attributed to the synergy between the basic properties of the apatites, their aptitude to chemisorb CO<sub>2</sub>
 and the catalytic features of the supported nickel.</div>
</front>
</TEI>
<affiliations><list><country><li>Maroc</li>
<li>Portugal</li>
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<name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name>
<name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name>
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<country name="Portugal"><noRegion><name sortKey="Boukha, Zouhair" sort="Boukha, Zouhair" uniqKey="Boukha Z" first="Zouhair" last="Boukha">Zouhair Boukha</name>
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<name sortKey="Faria, Joaquim L" sort="Faria, Joaquim L" uniqKey="Faria J" first="Joaquim L." last="Faria">Joaquim L. Faria</name>
<name sortKey="Figueiredo, Jose Luis" sort="Figueiredo, Jose Luis" uniqKey="Figueiredo J" first="José Luis" last="Figueiredo">José Luis Figueiredo</name>
<name sortKey="Pereira, Manuel Fernando R" sort="Pereira, Manuel Fernando R" uniqKey="Pereira M" first="Manuel Fernando R." last="Pereira">Manuel Fernando R. Pereira</name>
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</record>

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Serveur d'exploration sur le nickel au Maghreb

Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite

Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite

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