CobaltMaghrebV1, PascalFrancis, Curation, bibRecord, 000362

On the role of Fe and Co dopants during the activation of the VO(HPO4), O.5H2O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO4), 0.5H2O precursors prepared by reduction of VOPO4, 2 H2O by isobutanol

Identifieur interne : 000362 ( PascalFrancis/Curation ); précédent : 000361; suivant : 000363

On the role of Fe and Co dopants during the activation of the VO(HPO4), O.5H2O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO4), 0.5H2O precursors prepared by reduction of VOPO4, 2 H2O by isobutanol

Auteurs : M. T. Sananes-Schulz [France, Royaume-Uni] ; F. Ben Abdelouahab [Maroc] ; G. J. Hutchings [Royaume-Uni] ; J. C. Volta [France]

Source :

Journal of catalysis [ 0021-9517 ] ; 1996.

RBID : Pascal:96-0492337

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Préparation, Précurseur, Vanadium Oxyde, Phosphore Oxyde, Composé ternaire, Matériau modifié, Dopage, Fer, Cobalt, Spectrométrie Raman, Vanadyle Hydrogénophosphate, Composé quaternaire, Diffraction RX, Catalyse hétérogène, O P V, H O P V, VOHPO4.
Wicri :
- topic : Dopage, Fer, Cobalt.

English descriptors

KwdEn :
- Cobalt, Doping, Experimental study, Heterogeneous catalysis, Iron, Modified material, Phosphorus Oxides, Precursor, Preparation, Quaternary compound, Raman spectrometry, Ternary compound, Vanadium Oxides, Vanadyl Hydrogenphosphates, X ray diffraction.

Abstract

Two vanadium phosphorus oxide precursors doped by Co and Fe have been prepared by a new route consisting of a reduction of VOPO₄, 2H₂O by isobutanol which is known to give a particular morphology of VOHPO₄, 0.5H₂O, developing crystallites in the [110] direction. Their activation under n-butane/air catalytic atmosphere (1.5%) has been compared to the corresponding undoped precursor prepared under the same conditions and used as a reference. The modification of the structure of the VPO materials has been followed on-line by in situ laser Raman spectroscopy. In a first period of the activation, the nucleation of α₁-VOPO₄ is favoured for the undoped VPO precursor, while (VO)₂P₂O₇ appears in a second period. For the Co-doped VPO precursor, α_I- and α_II-VOPO₄ first appear, and then (VO)₂P₂O₇ appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of α_I-VOPO₄. When comparing with the classical organic route, catalytic performances are markedly improved when the VOHPO₄, 0.5H₂O precursor is prepared via this new route both for the undoped and the Co-doped VPO catalysts. At variance, the Fe-doped catalyst gives poorer performances which have been explained by a high oxidation state for this catalyst (almost (V⁵⁺) as α_I-VOPO₄). This is confirmed by an analysis of the bulk and surface composition of the final catalysts by XRD and XPS spectroscopy. The role of the two dopants on this new morphology of VOHPO₄, 0.5H₂O is then quite different at variance with what was observed on the same precursor prepared by the classical route of reduction of V₂O₅ by isobutanol (see B. Abdelouahab et al., 1995, J. Catal., 157, 687. The present study demonstrates that the preparative route for the formation of doped VPO precursors is most important in controlling the VOPO₄/(VO)₂P₂O₇ dispersion and catalytic performance of the final catalyst.

A01	`01`	`1`		`@0 0021-9517`
A02	`01`			`@0 JCTLA5`
A03		`1`		`@0 J. catal.`
A05				`@2 163`
A06				`@2 2`
A08	`01`	`1`	`ENG`	`@1 On the role of Fe and Co dopants during the activation of the VO(HPO₄), O.5H₂O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO₄), 0.5H₂O precursors prepared by reduction of VOPO₄, 2 H₂O by isobutanol`
A11	`01`	`1`		`@1 SANANES-SCHULZ (M. T.)`
A11	`02`	`1`		`@1 BEN ABDELOUAHAB (F.)`
A11	`03`	`1`		`@1 HUTCHINGS (G. J.)`
A11	`04`	`1`		`@1 VOLTA (J. C.)`
A14	`01`			`@1 Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein @2 69626 Villeurbanne @3 FRA @Z 1 aut. @Z 4 aut.`
A14	`02`			`@1 Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147 @2 Liverpool L69 3BX @3 GBR @Z 1 aut. @Z 3 aut.`
A14	`03`			`@1 Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121 @2 Tétouan @3 MAR @Z 2 aut.`
A20				`@1 346-353`
A21				`@1 1996`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 9623 @5 354000066598590140`
A44				`@0 0000 @1 © 1996 INIST-CNRS. All rights reserved.`
A45				`@0 14 ref.`
A47	`01`	`1`		`@0 96-0492337`
A60				`@1 P`
A61				`@0 A`
A64	`01`	`1`		`@0 Journal of catalysis`
A66	`01`			`@0 USA`
C01	`01`		`ENG`	@0 Two vanadium phosphorus oxide precursors doped by Co and Fe have been prepared by a new route consisting of a reduction of VOPO₄, 2H₂O by isobutanol which is known to give a particular morphology of VOHPO₄, 0.5H₂O, developing crystallites in the [110] direction. Their activation under n-butane/air catalytic atmosphere (1.5%) has been compared to the corresponding undoped precursor prepared under the same conditions and used as a reference. The modification of the structure of the VPO materials has been followed on-line by in situ laser Raman spectroscopy. In a first period of the activation, the nucleation of α₁-VOPO₄ is favoured for the undoped VPO precursor, while (VO)₂P₂O₇ appears in a second period. For the Co-doped VPO precursor, α_I- and α_II-VOPO₄ first appear, and then (VO)₂P₂O₇ appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of α_I-VOPO₄. When comparing with the classical organic route, catalytic performances are markedly improved when the VOHPO₄, 0.5H₂O precursor is prepared via this new route both for the undoped and the Co-doped VPO catalysts. At variance, the Fe-doped catalyst gives poorer performances which have been explained by a high oxidation state for this catalyst (almost (V⁵⁺) as α_I-VOPO₄). This is confirmed by an analysis of the bulk and surface composition of the final catalysts by XRD and XPS spectroscopy. The role of the two dopants on this new morphology of VOHPO₄, 0.5H₂O is then quite different at variance with what was observed on the same precursor prepared by the classical route of reduction of V₂O₅ by isobutanol (see B. Abdelouahab et al., 1995, J. Catal., 157, 687. The present study demonstrates that the preparative route for the formation of doped VPO precursors is most important in controlling the VOPO₄/(VO)₂P₂O₇ dispersion and catalytic performance of the final catalyst.
C02	`01`	`X`		`@0 001C01A03A`
C03	`01`	`X`	`FRE`	`@0 Etude expérimentale @5 01`
C03	`01`	`X`	`ENG`	`@0 Experimental study @5 01`
C03	`01`	`X`	`GER`	`@0 Experimentelle Untersuchung @5 01`
C03	`01`	`X`	`SPA`	`@0 Estudio experimental @5 01`
C03	`02`	`X`	`FRE`	`@0 Préparation @5 03`
C03	`02`	`X`	`ENG`	`@0 Preparation @5 03`
C03	`02`	`X`	`GER`	`@0 Vorbereitung @5 03`
C03	`02`	`X`	`SPA`	`@0 Preparación @5 03`
C03	`03`	`X`	`FRE`	`@0 Précurseur @5 04`
C03	`03`	`X`	`ENG`	`@0 Precursor @5 04`
C03	`03`	`X`	`SPA`	`@0 Precursor @5 04`
C03	`04`	`X`	`FRE`	`@0 Vanadium Oxyde @1 ACT @2 NC @2 FX @2 NA @5 06`
C03	`04`	`X`	`ENG`	`@0 Vanadium Oxides @1 ACT @2 NC @2 FX @2 NA @5 06`
C03	`04`	`X`	`SPA`	`@0 Vanadio Óxido @1 ACT @2 NC @2 FX @2 NA @5 06`
C03	`05`	`X`	`FRE`	`@0 Phosphore Oxyde @1 ACT @2 NC @2 NA @5 07`
C03	`05`	`X`	`ENG`	`@0 Phosphorus Oxides @1 ACT @2 NC @2 NA @5 07`
C03	`05`	`X`	`SPA`	`@0 Fósforo Óxido @1 ACT @2 NC @2 NA @5 07`
C03	`06`	`X`	`FRE`	`@0 Composé ternaire @5 08`
C03	`06`	`X`	`ENG`	`@0 Ternary compound @5 08`
C03	`06`	`X`	`SPA`	`@0 Compuesto ternario @5 08`
C03	`07`	`X`	`FRE`	`@0 Matériau modifié @5 10`
C03	`07`	`X`	`ENG`	`@0 Modified material @5 10`
C03	`07`	`X`	`SPA`	`@0 Material modificado @5 10`
C03	`08`	`X`	`FRE`	`@0 Dopage @5 11`
C03	`08`	`X`	`ENG`	`@0 Doping @5 11`
C03	`08`	`X`	`GER`	`@0 Dopen @5 11`
C03	`08`	`X`	`SPA`	`@0 Doping @5 11`
C03	`09`	`X`	`FRE`	`@0 Fer @2 NC @5 12`
C03	`09`	`X`	`ENG`	`@0 Iron @2 NC @5 12`
C03	`09`	`X`	`GER`	`@0 Eisen @2 NC @5 12`
C03	`09`	`X`	`SPA`	`@0 Hierro @2 NC @5 12`
C03	`10`	`X`	`FRE`	`@0 Cobalt @2 NC @5 13`
C03	`10`	`X`	`ENG`	`@0 Cobalt @2 NC @5 13`
C03	`10`	`X`	`GER`	`@0 Cobalt @2 NC @5 13`
C03	`10`	`X`	`SPA`	`@0 Cobalto @2 NC @5 13`
C03	`11`	`X`	`FRE`	`@0 Spectrométrie Raman @5 16`
C03	`11`	`X`	`ENG`	`@0 Raman spectrometry @5 16`
C03	`11`	`X`	`SPA`	`@0 Espectrometría Raman @5 16`
C03	`12`	`X`	`FRE`	`@0 Vanadyle Hydrogénophosphate @1 ACT @2 NC @2 NA @5 18`
C03	`12`	`X`	`ENG`	`@0 Vanadyl Hydrogenphosphates @1 ACT @2 NC @2 NA @5 18`
C03	`12`	`X`	`SPA`	`@0 Vanadilo Hidrógenofosfato @1 ACT @2 NC @2 NA @5 18`
C03	`13`	`X`	`FRE`	`@0 Composé quaternaire @5 19`
C03	`13`	`X`	`ENG`	`@0 Quaternary compound @5 19`
C03	`13`	`X`	`SPA`	`@0 Compuesto cuaternario @5 19`
C03	`14`	`X`	`FRE`	`@0 Diffraction RX @5 22`
C03	`14`	`X`	`ENG`	`@0 X ray diffraction @5 22`
C03	`14`	`X`	`GER`	`@0 Roentgenbeugung @5 22`
C03	`14`	`X`	`SPA`	`@0 Difracción RX @5 22`
C03	`15`	`X`	`FRE`	`@0 Catalyse hétérogène @5 23`
C03	`15`	`X`	`ENG`	`@0 Heterogeneous catalysis @5 23`
C03	`15`	`X`	`SPA`	`@0 Catálisis heterogénea @5 23`
C03	`16`	`X`	`FRE`	`@0 O P V @4 INC @5 32`
C03	`17`	`X`	`FRE`	`@0 H O P V @4 INC @5 33`
C03	`18`	`X`	`FRE`	`@0 VOHPO4 @4 INC @5 34`
C07	`01`	`X`	`FRE`	`@0 Métal transition Composé @2 NC @2 NA @5 05`
C07	`01`	`X`	`ENG`	`@0 Transition metal Compounds @2 NC @2 NA @5 05`
C07	`01`	`X`	`SPA`	`@0 Metal transición Compuesto @2 NC @2 NA @5 05`
C07	`02`	`X`	`FRE`	`@0 Métal transition @2 NC @5 14`
C07	`02`	`X`	`ENG`	`@0 Transition metal @2 NC @5 14`
C07	`02`	`X`	`GER`	`@0 Uebergangsmetalle @2 NC @5 14`
C07	`02`	`X`	`SPA`	`@0 Metal transición @2 NC @5 14`
N21				`@1 337`

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Le document en format XML

<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">On the role of Fe and Co dopants during the activation of the VO(HPO<sub>4</sub>
), O.5H<sub>2</sub>
O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO<sub>4</sub>
), 0.5H<sub>2</sub>
O precursors prepared by reduction of VOPO<sub>4</sub>
, 2 H<sub>2</sub>
O by isobutanol</title>
<author><name sortKey="Sananes Schulz, M T" sort="Sananes Schulz, M T" uniqKey="Sananes Schulz M" first="M. T." last="Sananes-Schulz">M. T. Sananes-Schulz</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein</s1>
<s2>69626 Villeurbanne</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
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</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147</s1>
<s2>Liverpool L69 3BX</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
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<author><name sortKey="Ben Abdelouahab, F" sort="Ben Abdelouahab, F" uniqKey="Ben Abdelouahab F" first="F." last="Ben Abdelouahab">F. Ben Abdelouahab</name>
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<author><name sortKey="Hutchings, G J" sort="Hutchings, G J" uniqKey="Hutchings G" first="G. J." last="Hutchings">G. J. Hutchings</name>
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<s2>Liverpool L69 3BX</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
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</author>
<author><name sortKey="Volta, J C" sort="Volta, J C" uniqKey="Volta J" first="J. C." last="Volta">J. C. Volta</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein</s1>
<s2>69626 Villeurbanne</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
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</titleStmt>
<publicationStmt><idno type="wicri:source">INIST</idno>
<idno type="inist">96-0492337</idno>
<date when="1996">1996</date>
<idno type="stanalyst">PASCAL 96-0492337 INIST</idno>
<idno type="RBID">Pascal:96-0492337</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">On the role of Fe and Co dopants during the activation of the VO(HPO<sub>4</sub>
), O.5H<sub>2</sub>
O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO<sub>4</sub>
), 0.5H<sub>2</sub>
O precursors prepared by reduction of VOPO<sub>4</sub>
, 2 H<sub>2</sub>
O by isobutanol</title>
<author><name sortKey="Sananes Schulz, M T" sort="Sananes Schulz, M T" uniqKey="Sananes Schulz M" first="M. T." last="Sananes-Schulz">M. T. Sananes-Schulz</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein</s1>
<s2>69626 Villeurbanne</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147</s1>
<s2>Liverpool L69 3BX</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Ben Abdelouahab, F" sort="Ben Abdelouahab, F" uniqKey="Ben Abdelouahab F" first="F." last="Ben Abdelouahab">F. Ben Abdelouahab</name>
<affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121</s1>
<s2>Tétouan</s2>
<s3>MAR</s3>
<sZ>2 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
</affiliation>
</author>
<author><name sortKey="Hutchings, G J" sort="Hutchings, G J" uniqKey="Hutchings G" first="G. J." last="Hutchings">G. J. Hutchings</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147</s1>
<s2>Liverpool L69 3BX</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Volta, J C" sort="Volta, J C" uniqKey="Volta J" first="J. C." last="Volta">J. C. Volta</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein</s1>
<s2>69626 Villeurbanne</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">Journal of catalysis</title>
<title level="j" type="abbreviated">J. catal.</title>
<idno type="ISSN">0021-9517</idno>
<imprint><date when="1996">1996</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">Journal of catalysis</title>
<title level="j" type="abbreviated">J. catal.</title>
<idno type="ISSN">0021-9517</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt</term>
<term>Doping</term>
<term>Experimental study</term>
<term>Heterogeneous catalysis</term>
<term>Iron</term>
<term>Modified material</term>
<term>Phosphorus Oxides</term>
<term>Precursor</term>
<term>Preparation</term>
<term>Quaternary compound</term>
<term>Raman spectrometry</term>
<term>Ternary compound</term>
<term>Vanadium Oxides</term>
<term>Vanadyl Hydrogenphosphates</term>
<term>X ray diffraction</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Préparation</term>
<term>Précurseur</term>
<term>Vanadium Oxyde</term>
<term>Phosphore Oxyde</term>
<term>Composé ternaire</term>
<term>Matériau modifié</term>
<term>Dopage</term>
<term>Fer</term>
<term>Cobalt</term>
<term>Spectrométrie Raman</term>
<term>Vanadyle Hydrogénophosphate</term>
<term>Composé quaternaire</term>
<term>Diffraction RX</term>
<term>Catalyse hétérogène</term>
<term>O P V</term>
<term>H O P V</term>
<term>VOHPO4</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Dopage</term>
<term>Fer</term>
<term>Cobalt</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Two vanadium phosphorus oxide precursors doped by Co and Fe have been prepared by a new route consisting of a reduction of VOPO<sub>4</sub>
, 2H<sub>2</sub>
O by isobutanol which is known to give a particular morphology of VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O, developing crystallites in the [110] direction. Their activation under n-butane/air catalytic atmosphere (1.5%) has been compared to the corresponding undoped precursor prepared under the same conditions and used as a reference. The modification of the structure of the VPO materials has been followed on-line by in situ laser Raman spectroscopy. In a first period of the activation, the nucleation of α<sub>1</sub>
-VOPO<sub>4</sub>
 is favoured for the undoped VPO precursor, while (VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 appears in a second period. For the Co-doped VPO precursor, α<sub>I</sub>
- and α<sub>II</sub>
-VOPO<sub>4</sub>
 first appear, and then (VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of α<sub>I</sub>
-VOPO<sub>4</sub>
. When comparing with the classical organic route, catalytic performances are markedly improved when the VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O precursor is prepared via this new route both for the undoped and the Co-doped VPO catalysts. At variance, the Fe-doped catalyst gives poorer performances which have been explained by a high oxidation state for this catalyst (almost (V<sup>5+</sup>
) as α<sub>I</sub>
-VOPO<sub>4</sub>
). This is confirmed by an analysis of the bulk and surface composition of the final catalysts by XRD and XPS spectroscopy. The role of the two dopants on this new morphology of VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O is then quite different at variance with what was observed on the same precursor prepared by the classical route of reduction of V<sub>2</sub>
O<sub>5</sub>
 by isobutanol (see B. Abdelouahab et al., 1995, J. Catal., 157, 687. The present study demonstrates that the preparative route for the formation of doped VPO precursors is most important in controlling the VOPO<sub>4</sub>
/(VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 dispersion and catalytic performance of the final catalyst.</div>
</front>
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<fA08 i1="01" i2="1" l="ENG"><s1>On the role of Fe and Co dopants during the activation of the VO(HPO<sub>4</sub>
), O.5H<sub>2</sub>
O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO<sub>4</sub>
), 0.5H<sub>2</sub>
O precursors prepared by reduction of VOPO<sub>4</sub>
, 2 H<sub>2</sub>
O by isobutanol</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>SANANES-SCHULZ (M. T.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>BEN ABDELOUAHAB (F.)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>HUTCHINGS (G. J.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>VOLTA (J. C.)</s1>
</fA11>
<fA14 i1="01"><s1>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein</s1>
<s2>69626 Villeurbanne</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147</s1>
<s2>Liverpool L69 3BX</s2>
<s3>GBR</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121</s1>
<s2>Tétouan</s2>
<s3>MAR</s3>
<sZ>2 aut.</sZ>
</fA14>
<fA20><s1>346-353</s1>
</fA20>
<fA21><s1>1996</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>9623</s2>
<s5>354000066598590140</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 1996 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>14 ref.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>96-0492337</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of catalysis</s0>
</fA64>
<fA66 i1="01"><s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Two vanadium phosphorus oxide precursors doped by Co and Fe have been prepared by a new route consisting of a reduction of VOPO<sub>4</sub>
, 2H<sub>2</sub>
O by isobutanol which is known to give a particular morphology of VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O, developing crystallites in the [110] direction. Their activation under n-butane/air catalytic atmosphere (1.5%) has been compared to the corresponding undoped precursor prepared under the same conditions and used as a reference. The modification of the structure of the VPO materials has been followed on-line by in situ laser Raman spectroscopy. In a first period of the activation, the nucleation of α<sub>1</sub>
-VOPO<sub>4</sub>
 is favoured for the undoped VPO precursor, while (VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 appears in a second period. For the Co-doped VPO precursor, α<sub>I</sub>
- and α<sub>II</sub>
-VOPO<sub>4</sub>
 first appear, and then (VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of α<sub>I</sub>
-VOPO<sub>4</sub>
. When comparing with the classical organic route, catalytic performances are markedly improved when the VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O precursor is prepared via this new route both for the undoped and the Co-doped VPO catalysts. At variance, the Fe-doped catalyst gives poorer performances which have been explained by a high oxidation state for this catalyst (almost (V<sup>5+</sup>
) as α<sub>I</sub>
-VOPO<sub>4</sub>
). This is confirmed by an analysis of the bulk and surface composition of the final catalysts by XRD and XPS spectroscopy. The role of the two dopants on this new morphology of VOHPO<sub>4</sub>
, 0.5H<sub>2</sub>
O is then quite different at variance with what was observed on the same precursor prepared by the classical route of reduction of V<sub>2</sub>
O<sub>5</sub>
 by isobutanol (see B. Abdelouahab et al., 1995, J. Catal., 157, 687. The present study demonstrates that the preparative route for the formation of doped VPO precursors is most important in controlling the VOPO<sub>4</sub>
/(VO)<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
 dispersion and catalytic performance of the final catalyst.</s0>
</fC01>
<fC02 i1="01" i2="X"><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>Préparation</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Preparation</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="X" l="GER"><s0>Vorbereitung</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Preparación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Précurseur</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Precursor</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Precursor</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Vanadium Oxyde</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>06</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Vanadium Oxides</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>06</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Vanadio Óxido</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Phosphore Oxyde</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Phosphorus Oxides</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Fósforo Óxido</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Composé ternaire</s0>
<s5>08</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Ternary compound</s0>
<s5>08</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Compuesto ternario</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Matériau modifié</s0>
<s5>10</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Modified material</s0>
<s5>10</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Material modificado</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Dopage</s0>
<s5>11</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Doping</s0>
<s5>11</s5>
</fC03>
<fC03 i1="08" i2="X" l="GER"><s0>Dopen</s0>
<s5>11</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Doping</s0>
<s5>11</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Fer</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Iron</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03>
<fC03 i1="09" i2="X" l="GER"><s0>Eisen</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Hierro</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>13</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>13</s5>
</fC03>
<fC03 i1="10" i2="X" l="GER"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>13</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Cobalto</s0>
<s2>NC</s2>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Spectrométrie Raman</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Raman spectrometry</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Espectrometría Raman</s0>
<s5>16</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Vanadyle Hydrogénophosphate</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>18</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Vanadyl Hydrogenphosphates</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>18</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Vanadilo Hidrógenofosfato</s0>
<s1>ACT</s1>
<s2>NC</s2>
<s2>NA</s2>
<s5>18</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Composé quaternaire</s0>
<s5>19</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Quaternary compound</s0>
<s5>19</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Compuesto cuaternario</s0>
<s5>19</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Diffraction RX</s0>
<s5>22</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>X ray diffraction</s0>
<s5>22</s5>
</fC03>
<fC03 i1="14" i2="X" l="GER"><s0>Roentgenbeugung</s0>
<s5>22</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Difracción RX</s0>
<s5>22</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Catalyse hétérogène</s0>
<s5>23</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Heterogeneous catalysis</s0>
<s5>23</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Catálisis heterogénea</s0>
<s5>23</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>O P V</s0>
<s4>INC</s4>
<s5>32</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>H O P V</s0>
<s4>INC</s4>
<s5>33</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>VOHPO4</s0>
<s4>INC</s4>
<s5>34</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Métal transition Composé</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>05</s5>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Transition metal Compounds</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>05</s5>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Metal transición Compuesto</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>05</s5>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Métal transition</s0>
<s2>NC</s2>
<s5>14</s5>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Transition metal</s0>
<s2>NC</s2>
<s5>14</s5>
</fC07>
<fC07 i1="02" i2="X" l="GER"><s0>Uebergangsmetalle</s0>
<s2>NC</s2>
<s5>14</s5>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Metal transición</s0>
<s2>NC</s2>
<s5>14</s5>
</fC07>
<fN21><s1>337</s1>
</fN21>
</pA>
</standard>
</inist>
</record>

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   |texte=   On the role of Fe and Co dopants during the activation of the VO(HPO4), O.5H2O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO4), 0.5H2O precursors prepared by reduction of VOPO4, 2 H2O by isobutanol
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	Serveur d'exploration sur le cobalt au Maghreb
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On the role of Fe and Co dopants during the activation of the VO(HPO4), O.5H2O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO4), 0.5H2O precursors prepared by reduction of VOPO4, 2 H2O by isobutanol

On the role of Fe and Co dopants during the activation of the VO(HPO4), O.5H2O precursor of the vanadium phosphorus catalyst as studied by in situ laser Raman spectroscopy. II. Study of VO(HPO4), 0.5H2O precursors prepared by reduction of VOPO4, 2 H2O by isobutanol

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