In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions
Identifieur interne : 000354 ( PascalFrancis/Corpus ); précédent : 000353; suivant : 000355In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions
Auteurs : B. Benaichouba ; P. Bussiere ; J. C. VedrineSource :
- Applied catalysis. A, General [ 0926-860X ] ; 1995.
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English descriptors
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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.
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Format Inist (serveur)
| NO : | PASCAL 95-0549176 INIST |
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| ET : | In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions |
| AU : | BENAICHOUBA (B.); BUSSIERE (P.); VEDRINE (J. C.) |
| AF : | Ecole normale supérieure Mostaganem, lab. spectroscopie matériaux/27000 Mostaganem/Algérie (1 aut.); CNRS Univ. Claude Bernard, inst. rech. catalyse/69626 Villeurbanne/France (2 aut., 3 aut.) |
| DT : | Publication en série; Niveau analytique |
| SO : | Applied catalysis. A, General; ISSN 0926-860X; Pays-Bas; Da. 1995; Vol. 130; No. 1; Pp. 31-45; Bibl. 21 ref. |
| LA : | Anglais |
| EA : | 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. |
| CC : | 001C01A03A |
| FD : | 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 |
| FG : | Métal transition Composé |
| ED : | Experimental study; Moessbauer spectrometry; Catalyst; Iron Oxides; Cobalt Oxides; Molybdenum Oxides; Bismuth Oxides; Catalytic reaction; Oxidation; Hydrocarbon; Ethylenic compound; Propene; Acrolein; Heterogeneous catalysis; Quaternary compound |
| EG : | Transition metal Compounds |
| GD : | Experimentelle Untersuchung; Moessbauer Spektrometrie; Katalysator; Oxidation; Kohlenwasserstoff |
| SD : | Estudio experimental; Espectrometría Mössbauer; Catalizador; Hierro Óxido; Cobalto Óxido; Molibdeno Óxido; Bismuto Óxido; Reacción catalítica; Oxidación; Hidrocarburo; Compuesto etilénico; Propeno; Acroleína; Catálisis heterogénea |
| LO : | INIST-18840A.354000050026060040 |
| ID : | 95-0549176 |
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions</title><author><name sortKey="Benaichouba, B" sort="Benaichouba, B" uniqKey="Benaichouba B" first="B." last="Benaichouba">B. Benaichouba</name><affiliation><inist:fA14 i1="01"><s1>Ecole normale supérieure Mostaganem, lab. spectroscopie matériaux</s1><s2>27000 Mostaganem</s2><s3>DZA</s3><sZ>1 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Bussiere, P" sort="Bussiere, P" uniqKey="Bussiere P" first="P." last="Bussiere">P. Bussiere</name><affiliation><inist:fA14 i1="02"><s1>CNRS Univ. Claude Bernard, inst. rech. catalyse</s1><s2>69626 Villeurbanne</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Vedrine, J C" sort="Vedrine, J C" uniqKey="Vedrine J" first="J. C." last="Vedrine">J. C. Vedrine</name><affiliation><inist:fA14 i1="02"><s1>CNRS Univ. Claude Bernard, inst. rech. catalyse</s1><s2>69626 Villeurbanne</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">95-0549176</idno><date when="1995">1995</date><idno type="stanalyst">PASCAL 95-0549176 INIST</idno><idno type="RBID">Pascal:95-0549176</idno><idno type="wicri:Area/PascalFrancis/Corpus">000354</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions</title><author><name sortKey="Benaichouba, B" sort="Benaichouba, B" uniqKey="Benaichouba B" first="B." last="Benaichouba">B. Benaichouba</name><affiliation><inist:fA14 i1="01"><s1>Ecole normale supérieure Mostaganem, lab. spectroscopie matériaux</s1><s2>27000 Mostaganem</s2><s3>DZA</s3><sZ>1 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Bussiere, P" sort="Bussiere, P" uniqKey="Bussiere P" first="P." last="Bussiere">P. Bussiere</name><affiliation><inist:fA14 i1="02"><s1>CNRS Univ. Claude Bernard, inst. rech. catalyse</s1><s2>69626 Villeurbanne</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Vedrine, J C" sort="Vedrine, J C" uniqKey="Vedrine J" first="J. C." last="Vedrine">J. C. Vedrine</name><affiliation><inist:fA14 i1="02"><s1>CNRS Univ. Claude Bernard, inst. rech. catalyse</s1><s2>69626 Villeurbanne</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14></affiliation></author></analytic><series><title level="j" type="main">Applied catalysis. A, General</title><title level="j" type="abbreviated">Appl. catal., A Gen.</title><idno type="ISSN">0926-860X</idno><imprint><date when="1995">1995</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Applied catalysis. A, General</title><title level="j" type="abbreviated">Appl. catal., A Gen.</title><idno type="ISSN">0926-860X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acrolein</term><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></textClass></profileDesc></teiHeader><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><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0926-860X</s0></fA01><fA03 i2="1"><s0>Appl. catal., A Gen.</s0></fA03><fA05><s2>130</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions</s1></fA08><fA11 i1="01" i2="1"><s1>BENAICHOUBA (B.)</s1></fA11><fA11 i1="02" i2="1"><s1>BUSSIERE (P.)</s1></fA11><fA11 i1="03" i2="1"><s1>VEDRINE (J. C.)</s1></fA11><fA14 i1="01"><s1>Ecole normale supérieure Mostaganem, lab. spectroscopie matériaux</s1><s2>27000 Mostaganem</s2><s3>DZA</s3><sZ>1 aut.</sZ></fA14><fA14 i1="02"><s1>CNRS Univ. Claude Bernard, inst. rech. catalyse</s1><s2>69626 Villeurbanne</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA20><s1>31-45</s1></fA20><fA21><s1>1995</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>18840A</s2><s5>354000050026060040</s5></fA43><fA44><s0>0000</s0></fA44><fA45><s0>21 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>95-0549176</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Applied catalysis. A, General</s0></fA64><fA66 i1="01"><s0>NLD</s0></fA66><fC01 i1="01" l="ENG"><s0>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.</s0></fC01><fC02 i1="01" i2="1"><s0>001C01A03A</s0></fC02><fC03 i1="01" i2="X" l="FRE"><s0>Etude expérimentale</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="ENG"><s0>Experimental study</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="GER"><s0>Experimentelle Untersuchung</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="SPA"><s0>Estudio experimental</s0><s5>01</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Spectrométrie Mössbauer</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Moessbauer spectrometry</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="GER"><s0>Moessbauer Spektrometrie</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Espectrometría Mössbauer</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Catalyseur</s0><s5>05</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>Catalyst</s0><s5>05</s5></fC03><fC03 i1="03" i2="X" l="GER"><s0>Katalysator</s0><s5>05</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Catalizador</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Fer Oxyde</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>07</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Iron Oxides</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>07</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Hierro Óxido</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>07</s5></fC03><fC03 i1="05" i2="X" l="FRE"><s0>Cobalt Oxyde</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>08</s5></fC03><fC03 i1="05" i2="X" l="ENG"><s0>Cobalt Oxides</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>08</s5></fC03><fC03 i1="05" i2="X" l="SPA"><s0>Cobalto Óxido</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>08</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Molybdène Oxyde</s0><s1>ACT</s1><s2>NC</s2><s2>FX</s2><s2>NA</s2><s5>09</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Molybdenum Oxides</s0><s1>ACT</s1><s2>NC</s2><s2>FX</s2><s2>NA</s2><s5>09</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Molibdeno Óxido</s0><s1>ACT</s1><s2>NC</s2><s2>FX</s2><s2>NA</s2><s5>09</s5></fC03><fC03 i1="07" i2="X" l="FRE"><s0>Bismuth Oxyde</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>10</s5></fC03><fC03 i1="07" i2="X" l="ENG"><s0>Bismuth Oxides</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>10</s5></fC03><fC03 i1="07" i2="X" l="SPA"><s0>Bismuto Óxido</s0><s1>ACT</s1><s2>NC</s2><s2>NA</s2><s5>10</s5></fC03><fC03 i1="08" i2="X" l="FRE"><s0>Réaction catalytique</s0><s5>12</s5></fC03><fC03 i1="08" i2="X" l="ENG"><s0>Catalytic reaction</s0><s5>12</s5></fC03><fC03 i1="08" i2="X" l="SPA"><s0>Reacción catalítica</s0><s5>12</s5></fC03><fC03 i1="09" i2="X" l="FRE"><s0>Oxydation</s0><s5>13</s5></fC03><fC03 i1="09" i2="X" l="ENG"><s0>Oxidation</s0><s5>13</s5></fC03><fC03 i1="09" i2="X" l="GER"><s0>Oxidation</s0><s5>13</s5></fC03><fC03 i1="09" i2="X" l="SPA"><s0>Oxidación</s0><s5>13</s5></fC03><fC03 i1="10" i2="X" l="FRE"><s0>Hydrocarbure</s0><s2>FX</s2><s5>14</s5></fC03><fC03 i1="10" i2="X" l="ENG"><s0>Hydrocarbon</s0><s2>FX</s2><s5>14</s5></fC03><fC03 i1="10" i2="X" l="GER"><s0>Kohlenwasserstoff</s0><s2>FX</s2><s5>14</s5></fC03><fC03 i1="10" i2="X" l="SPA"><s0>Hidrocarburo</s0><s2>FX</s2><s5>14</s5></fC03><fC03 i1="11" i2="X" l="FRE"><s0>Composé éthylénique</s0><s5>15</s5></fC03><fC03 i1="11" i2="X" l="ENG"><s0>Ethylenic compound</s0><s5>15</s5></fC03><fC03 i1="11" i2="X" l="SPA"><s0>Compuesto etilénico</s0><s5>15</s5></fC03><fC03 i1="12" i2="X" l="FRE"><s0>Propène</s0><s1>ENT</s1><s2>NK</s2><s5>16</s5></fC03><fC03 i1="12" i2="X" l="ENG"><s0>Propene</s0><s1>ENT</s1><s2>NK</s2><s5>16</s5></fC03><fC03 i1="12" i2="X" l="SPA"><s0>Propeno</s0><s1>ENT</s1><s2>NK</s2><s5>16</s5></fC03><fC03 i1="13" i2="X" l="FRE"><s0>Acroléine</s0><s1>FIN</s1><s2>NK</s2><s2>FX</s2><s5>18</s5></fC03><fC03 i1="13" i2="X" l="ENG"><s0>Acrolein</s0><s1>FIN</s1><s2>NK</s2><s2>FX</s2><s5>18</s5></fC03><fC03 i1="13" i2="X" l="SPA"><s0>Acroleína</s0><s1>FIN</s1><s2>NK</s2><s2>FX</s2><s5>18</s5></fC03><fC03 i1="14" i2="X" l="FRE"><s0>Catalyse hétérogène</s0><s5>19</s5></fC03><fC03 i1="14" i2="X" l="ENG"><s0>Heterogeneous catalysis</s0><s5>19</s5></fC03><fC03 i1="14" i2="X" l="SPA"><s0>Catálisis heterogénea</s0><s5>19</s5></fC03><fC03 i1="15" i2="X" l="FRE"><s0>FexCo1-xMoO4</s0><s4>INC</s4><s5>32</s5></fC03><fC03 i1="16" i2="X" l="FRE"><s0>Co Fe Mo O</s0><s4>INC</s4><s5>33</s5></fC03><fC03 i1="17" i2="X" l="FRE"><s0>Composé quaternaire</s0><s4>CD</s4><s5>96</s5></fC03><fC03 i1="17" i2="X" l="ENG"><s0>Quaternary compound</s0><s4>CD</s4><s5>96</s5></fC03><fC07 i1="01" i2="X" l="FRE"><s0>Métal transition Composé</s0><s2>NC</s2><s2>NA</s2><s5>06</s5></fC07><fC07 i1="01" i2="X" l="ENG"><s0>Transition metal Compounds</s0><s2>NC</s2><s2>NA</s2><s5>06</s5></fC07><fC07 i1="01" i2="X" l="SPA"><s0>Metal transición Compuesto</s0><s2>NC</s2><s2>NA</s2><s5>06</s5></fC07><fN21><s1>317</s1></fN21></pA></standard><server><NO>PASCAL 95-0549176 INIST</NO><ET>In-situ Mössbauer spectroscopic study of iron site evolution in iron and cobalt molybdates catalysts in propene oxidation reaction conditions</ET><AU>BENAICHOUBA (B.); BUSSIERE (P.); VEDRINE (J. C.)</AU><AF>Ecole normale supérieure Mostaganem, lab. spectroscopie matériaux/27000 Mostaganem/Algérie (1 aut.); CNRS Univ. Claude Bernard, inst. rech. catalyse/69626 Villeurbanne/France (2 aut., 3 aut.)</AF><DT>Publication en série; Niveau analytique</DT><SO>Applied catalysis. A, General; ISSN 0926-860X; Pays-Bas; Da. 1995; Vol. 130; No. 1; Pp. 31-45; Bibl. 21 ref.</SO><LA>Anglais</LA><EA>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.</EA><CC>001C01A03A</CC><FD>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</FD><FG>Métal transition Composé</FG><ED>Experimental study; Moessbauer spectrometry; Catalyst; Iron Oxides; Cobalt Oxides; Molybdenum Oxides; Bismuth Oxides; Catalytic reaction; Oxidation; Hydrocarbon; Ethylenic compound; Propene; Acrolein; Heterogeneous catalysis; Quaternary compound</ED><EG>Transition metal Compounds</EG><GD>Experimentelle Untersuchung; Moessbauer Spektrometrie; Katalysator; Oxidation; Kohlenwasserstoff</GD><SD>Estudio experimental; Espectrometría Mössbauer; Catalizador; Hierro Óxido; Cobalto Óxido; Molibdeno Óxido; Bismuto Óxido; Reacción catalítica; Oxidación; Hidrocarburo; Compuesto etilénico; Propeno; Acroleína; Catálisis heterogénea</SD><LO>INIST-18840A.354000050026060040</LO><ID>95-0549176</ID></server></inist></record>Pour manipuler ce document sous Unix (Dilib)
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