CobaltMaghrebV1, Main, Exploration, bibRecord, 001171

In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions

Identifieur interne : 001171 ( Main/Exploration ); précédent : 001170; suivant : 001172

In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions

Auteurs : B. Benaichouba [Algérie] ; P. Bussiere [France] ; J. C. Vedrine [France]

Source :

Applied catalysis. A, General [ 0926-860X ] ; 1995.

RBID : Pascal:95-0549176

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Spectrométrie Mössbauer, Catalyseur, Fer Oxyde, Cobalt Oxyde, Molybdène Oxyde, Bismuth Oxyde, Réaction catalytique, Oxydation, Hydrocarbure, Composé éthylénique, Propène, Acroléine, Catalyse hétérogène, FexCo1-xMoO4, Co Fe Mo O, Composé quaternaire.
Wicri :
- topic : Hydrocarbure.

English descriptors

KwdEn :
- Acrolein, Bismuth Oxides, Catalyst, Catalytic reaction, Cobalt Oxides, Ethylenic compound, Experimental study, Heterogeneous catalysis, Hydrocarbon, Iron Oxides, Moessbauer spectrometry, Molybdenum Oxides, Oxidation, Propene, Quaternary compound.

Abstract

In-situ Mössbauer spectroscopy was used to study Fe_xco_1-xMoO₄ molybdates and their mixtures with Bi₂(MoO₄)₃ in the 360-415°C range under a flow of a mixture C₃H₆/0₂/N_S=100/100/560 Torr. Ferrous molybdate FeMo0₄ was progressively oxidized to ferric molybdate and ferric oxide. Mixed cobalt and iron molybdates Fe_xco_1-xMoO₄ exhibited the following behaviour : (1) for all iron contents, the α phase spectrum diminished to the benefit of the β phase. The Fe³⁺ sites of the solid solution underwent reduction. At high iron content, the Fe³⁺ in Fe₂(MoO₄)₃ was detected and diminished by half under catalytic conditions ; (2) when Bi₂(MoO₄)₃ was added to Fe_xCo_1-xMoO₄, there was no reduction of Fe³⁺ sites in the solid solution. The α → β phase transition was not observed in the case of the low and medium iron contents. In the high iron content samples the α-phase spectrum decreased to the expense of the β phase but did not disappear totally after catalytic reaction. It is concluded that cobalt stabilizes Fe²⁺ sites in the solid solution while Bi₂(MoO₄) stabilizes Fe³⁺ in the solid solution. It is proposed that Fe²⁺-Fe³⁺ pairs take an important place in the mechanism of propene mild oxidation.

Affiliations:

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Le document en format XML

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<term>Catalytic reaction</term>
<term>Cobalt Oxides</term>
<term>Ethylenic compound</term>
<term>Experimental study</term>
<term>Heterogeneous catalysis</term>
<term>Hydrocarbon</term>
<term>Iron Oxides</term>
<term>Moessbauer spectrometry</term>
<term>Molybdenum Oxides</term>
<term>Oxidation</term>
<term>Propene</term>
<term>Quaternary compound</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Spectrométrie Mössbauer</term>
<term>Catalyseur</term>
<term>Fer Oxyde</term>
<term>Cobalt Oxyde</term>
<term>Molybdène Oxyde</term>
<term>Bismuth Oxyde</term>
<term>Réaction catalytique</term>
<term>Oxydation</term>
<term>Hydrocarbure</term>
<term>Composé éthylénique</term>
<term>Propène</term>
<term>Acroléine</term>
<term>Catalyse hétérogène</term>
<term>FexCo1-xMoO4</term>
<term>Co Fe Mo O</term>
<term>Composé quaternaire</term>
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<front><div type="abstract" xml:lang="en">In-situ Mössbauer spectroscopy was used to study Fe<sub>x</sub>
co<sub>1-x</sub>
MoO<sub>4</sub>
 molybdates and their mixtures with Bi<sub>2</sub>
(MoO<sub>4</sub>
)<sub>3</sub>
 in the 360-415°C range under a flow of a mixture C<sub>3</sub>
H<sub>6</sub>
/0<sub>2</sub>
/N<sub>S</sub>
=100/100/560 Torr. Ferrous molybdate FeMo0<sub>4</sub>
 was progressively oxidized to ferric molybdate and ferric oxide. Mixed cobalt and iron molybdates Fe<sub>x</sub>
co<sub>1-x</sub>
MoO<sub>4</sub>
 exhibited the following behaviour : (1) for all iron contents, the α phase spectrum diminished to the benefit of the β phase. The Fe<sup>3+</sup>
 sites of the solid solution underwent reduction. At high iron content, the Fe<sup>3+</sup>
 in Fe<sub>2</sub>
(MoO<sub>4</sub>
)<sub>3</sub>
 was detected and diminished by half under catalytic conditions ; (2) when Bi<sub>2</sub>
(MoO<sub>4</sub>
)<sub>3</sub>
 was added to Fe<sub>x</sub>
Co<sub>1-x</sub>
MoO<sub>4</sub>
, there was no reduction of Fe<sup>3+</sup>
 sites in the solid solution. The α → β phase transition was not observed in the case of the low and medium iron contents. In the high iron content samples the α-phase spectrum decreased to the expense of the β phase but did not disappear totally after catalytic reaction. It is concluded that cobalt stabilizes Fe<sup>2+</sup>
 sites in the solid solution while Bi<sub>2</sub>
(MoO<sub>4</sub>
) stabilizes Fe<sup>3+</sup>
 in the solid solution. It is proposed that Fe<sup>2+</sup>
-Fe<sup>3+</sup>
 pairs take an important place in the mechanism of propene mild oxidation.</div>
</front>
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</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Rhône-Alpes</li>
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<settlement><li>Villeurbanne</li>
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<tree><country name="Algérie"><noRegion><name sortKey="Benaichouba, B" sort="Benaichouba, B" uniqKey="Benaichouba B" first="B." last="Benaichouba">B. Benaichouba</name>
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<name sortKey="Vedrine, J C" sort="Vedrine, J C" uniqKey="Vedrine J" first="J. C." last="Vedrine">J. C. Vedrine</name>
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In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions

In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions

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