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 : 001172In-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.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Hydrocarbure.
English descriptors
- KwdEn :
Abstract
In-situ Mössbauer spectroscopy was used to study Fexco1-xMoO4 molybdates and their mixtures with Bi2(MoO4)3 in the 360-415°C range under a flow of a mixture C3H6/02/NS=100/100/560 Torr. Ferrous molybdate FeMo04 was progressively oxidized to ferric molybdate and ferric oxide. Mixed cobalt and iron molybdates Fexco1-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 FexCo1-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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<s2>69626 Villeurbanne</s2>
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<sZ>2 aut.</sZ>
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<country>France</country>
<placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region>
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<region type="old region" nuts="2">Rhône-Alpes</region>
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<series><title level="j" type="main">Applied catalysis. A, General</title>
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<term>Bismuth Oxides</term>
<term>Catalyst</term>
<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>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Hydrocarbure</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>
</TEI>
<affiliations><list><country><li>Algérie</li>
<li>France</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Rhône-Alpes</li>
</region>
<settlement><li>Villeurbanne</li>
</settlement>
</list>
<tree><country name="Algérie"><noRegion><name sortKey="Benaichouba, B" sort="Benaichouba, B" uniqKey="Benaichouba B" first="B." last="Benaichouba">B. Benaichouba</name>
</noRegion>
</country>
<country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Bussiere, P" sort="Bussiere, P" uniqKey="Bussiere P" first="P." last="Bussiere">P. Bussiere</name>
</region>
<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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