On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy
Identifieur interne : 001500 ( Istex/Corpus ); précédent : 001499; suivant : 001501On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy
Auteurs : M. T. Sananés-Schulz ; F. Ben Abdelouahab ; G. J. Hutchings ; J. C. VoltaSource :
- Journal of Catalysis [ 0021-9517 ] ; 1996.
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 undern-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 byin situlaser Raman spectroscopy. In a first period of the activation, the nucleation of αI-VOPO4is favoured for the undoped VPO precursor, while (VO)2P2O7appears in a second period. For the Co-doped VPO precursor, αI- and αII-VOPO4first appear, and then (VO)2P2O7appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of αI-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 αI-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 V2O5by isobutanol (see B. Abdelouahabet 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)2P2O7dispersion and catalytic performance of the final catalyst.
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DOI: 10.1006/jcat.1996.0336
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy</title><author><name sortKey="Sananes Schulz, M T" sort="Sananes Schulz, M T" uniqKey="Sananes Schulz M" first="M. T." last="Sananés-Schulz">M. T. Sananés-Schulz</name><affiliation><mods:affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</mods:affiliation></affiliation></author><author><name sortKey="Abdelouahab, F Ben" sort="Abdelouahab, F Ben" uniqKey="Abdelouahab F" first="F. Ben" last="Abdelouahab">F. Ben Abdelouahab</name><affiliation><mods:affiliation>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</mods:affiliation></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><mods:affiliation>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</mods:affiliation></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><mods:affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. 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Sananés-Schulz</name><affiliation><mods:affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</mods:affiliation></affiliation></author><author><name sortKey="Abdelouahab, F Ben" sort="Abdelouahab, F Ben" uniqKey="Abdelouahab F" first="F. Ben" last="Abdelouahab">F. Ben Abdelouahab</name><affiliation><mods:affiliation>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</mods:affiliation></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><mods:affiliation>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</mods:affiliation></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><mods:affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Catalysis</title><title level="j" type="abbrev">YJCAT</title><idno type="ISSN">0021-9517</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1996">1996</date><biblScope unit="volume">163</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="346">346</biblScope><biblScope unit="page" to="353">353</biblScope></imprint><idno type="ISSN">0021-9517</idno></series><idno type="istex">66DA8E4FB964503759F079A2260B5F8068DBACA3</idno><idno type="DOI">10.1006/jcat.1996.0336</idno><idno type="PII">S0021-9517(96)90336-X</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9517</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></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 VOPO4, 2H2O by isobutanol which is known to give a particular morphology of VOHPO4, 0.5H2O, developing crystallites in the [110] direction. Their activation undern-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 byin situlaser Raman spectroscopy. In a first period of the activation, the nucleation of αI-VOPO4is favoured for the undoped VPO precursor, while (VO)2P2O7appears in a second period. For the Co-doped VPO precursor, αI- and αII-VOPO4first appear, and then (VO)2P2O7appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of αI-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 αI-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 V2O5by isobutanol (see B. Abdelouahabet 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)2P2O7dispersion and catalytic performance of the final catalyst.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>M.T. Sananés-Schulz</name><affiliations><json:string>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</json:string></affiliations></json:item><json:item><name>F.Ben Abdelouahab</name><affiliations><json:string>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</json:string></affiliations></json:item><json:item><name>G.J. Hutchings</name><affiliations><json:string>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</json:string></affiliations></json:item><json:item><name>J.C. Volta</name><affiliations><json:string>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><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 undern-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 byin situlaser Raman spectroscopy. In a first period of the activation, the nucleation of αI-VOPO4is favoured for the undoped VPO precursor, while (VO)2P2O7appears in a second period. For the Co-doped VPO precursor, αI- and αII-VOPO4first appear, and then (VO)2P2O7appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of αI-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 αI-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 V2O5by isobutanol (see B. Abdelouahabet 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)2P2O7dispersion and catalytic performance of the final catalyst.</abstract><qualityIndicators><score>7.159</score><pdfVersion>1.1</pdfVersion><pdfPageSize>551 x 744 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1851</abstractCharCount><pdfWordCount>4159</pdfWordCount><pdfCharCount>23035</pdfCharCount><pdfPageCount>8</pdfPageCount><abstractWordCount>281</abstractWordCount></qualityIndicators><title>On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy</title><pii><json:string>S0021-9517(96)90336-X</json:string></pii><genre><json:string>research-article</json:string></genre><host><volume>163</volume><pii><json:string>S0021-9517(00)X0088-7</json:string></pii><pages><last>353</last><first>346</first></pages><issn><json:string>0021-9517</json:string></issn><issue>2</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Journal of Catalysis</title><publicationDate>1996</publicationDate></host><categories><wos><json:string>ENGINEERING, CHEMICAL</json:string><json:string>CHEMISTRY, PHYSICAL</json:string></wos></categories><publicationDate>1996</publicationDate><copyrightDate>1996</copyrightDate><doi><json:string>10.1006/jcat.1996.0336</json:string></doi><id>66DA8E4FB964503759F079A2260B5F8068DBACA3</id><score>0.039055668</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/66DA8E4FB964503759F079A2260B5F8068DBACA3/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/66DA8E4FB964503759F079A2260B5F8068DBACA3/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/66DA8E4FB964503759F079A2260B5F8068DBACA3/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy</title><title level="a" type="sub" xml:lang="en">II. Study of VO(HPO4), 0.5 H2O Precursors Prepared by Reduction of VOPO4, 2 H2O by Isobutanol</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>©1996 Academic Press</p></availability><date>1996</date></publicationStmt><notesStmt><note type="content">Section title: Regular Article</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy</title><title level="a" type="sub" xml:lang="en">II. Study of VO(HPO4), 0.5 H2O Precursors Prepared by Reduction of VOPO4, 2 H2O by Isobutanol</title><author xml:id="author-1"><persName><forename type="first">M.T.</forename><surname>Sananés-Schulz</surname></persName><affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</affiliation></author><author xml:id="author-2"><persName><forename type="first">F.Ben</forename><surname>Abdelouahab</surname></persName><affiliation>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</affiliation></author><author xml:id="author-3"><persName><forename type="first">G.J.</forename><surname>Hutchings</surname></persName><affiliation>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</affiliation></author><author xml:id="author-4"><persName><forename type="first">J.C.</forename><surname>Volta</surname></persName><affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</affiliation></author></analytic><monogr><title level="j">Journal of Catalysis</title><title level="j" type="abbrev">YJCAT</title><idno type="pISSN">0021-9517</idno><idno type="PII">S0021-9517(00)X0088-7</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1996"></date><biblScope unit="volume">163</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="346">346</biblScope><biblScope unit="page" to="353">353</biblScope></imprint></monogr><idno type="istex">66DA8E4FB964503759F079A2260B5F8068DBACA3</idno><idno type="DOI">10.1006/jcat.1996.0336</idno><idno type="PII">S0021-9517(96)90336-X</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1996</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>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 undern-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 byin situlaser Raman spectroscopy. In a first period of the activation, the nucleation of αI-VOPO4is favoured for the undoped VPO precursor, while (VO)2P2O7appears in a second period. For the Co-doped VPO precursor, αI- and αII-VOPO4first appear, and then (VO)2P2O7appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of αI-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 αI-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 V2O5by isobutanol (see B. Abdelouahabet 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)2P2O7dispersion and catalytic performance of the final catalyst.</p></abstract></profileDesc><revisionDesc><change when="1996-05-15">Modified</change><change when="1996">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-10-7">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/66DA8E4FB964503759F079A2260B5F8068DBACA3/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier converted-article found"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla" xml:lang="en"><item-info><jid>YJCAT</jid><aid>90336</aid><ce:pii>S0021-9517(96)90336-X</ce:pii><ce:doi>10.1006/jcat.1996.0336</ce:doi><ce:copyright type="full-transfer" year="1996">Academic Press</ce:copyright></item-info><head><ce:dochead><ce:textfn>Regular Article</ce:textfn></ce:dochead><ce:title>On the Role of Fe and Co Dopants during the Activation of the VO(HPO<ce:inf>4</ce:inf>), 0.5 H<ce:inf>2</ce:inf>O Precursor of the Vanadium Phosphorus Catalyst as Studied by<ce:italic>in Situ</ce:italic>Laser Raman Spectroscopy</ce:title><ce:subtitle>II. Study of VO(HPO<ce:inf>4</ce:inf>), 0.5 H<ce:inf>2</ce:inf>O Precursors Prepared by Reduction of VOPO<ce:inf>4</ce:inf>, 2 H<ce:inf>2</ce:inf>O by Isobutanol</ce:subtitle><ce:author-group><ce:author><ce:given-name>M.T.</ce:given-name><ce:surname>Sananés-Schulz</ce:surname><ce:cross-ref refid="A0"><ce:sup>a</ce:sup></ce:cross-ref><ce:cross-ref refid="A1"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>F.Ben</ce:given-name><ce:surname>Abdelouahab</ce:surname><ce:cross-ref refid="A2"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>G.J.</ce:given-name><ce:surname>Hutchings</ce:surname><ce:cross-ref refid="A1"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>J.C.</ce:given-name><ce:surname>Volta</ce:surname><ce:cross-ref refid="A0"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="A0"><ce:label>a</ce:label><ce:textfn>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</ce:textfn></ce:affiliation><ce:affiliation id="A1"><ce:label>b</ce:label><ce:textfn>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</ce:textfn></ce:affiliation><ce:affiliation id="A2"><ce:label>c</ce:label><ce:textfn>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="18" month="12" year="1995"></ce:date-received><ce:date-revised day="15" month="5" year="1996"></ce:date-revised><ce:date-accepted day="3" month="6" year="1996"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Two vanadium phosphorus oxide precursors doped by Co and Fe have been prepared by a new route consisting of a reduction of VOPO<ce:inf>4</ce:inf>, 2H<ce:inf>2</ce:inf>O by isobutanol which is known to give a particular morphology of VOHPO<ce:inf>4</ce:inf>, 0.5H<ce:inf>2</ce:inf>O, developing crystallites in the [110] direction. Their activation under<ce:italic>n</ce:italic>-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<ce:italic>in situ</ce:italic>laser Raman spectroscopy. In a first period of the activation, the nucleation of α<ce:inf>I</ce:inf>-VOPO<ce:inf>4</ce:inf>is favoured for the undoped VPO precursor, while (VO)<ce:inf>2</ce:inf>P<ce:inf>2</ce:inf>O<ce:inf>7</ce:inf>appears in a second period. For the Co-doped VPO precursor, α<ce:inf>I</ce:inf>- and α<ce:inf>II</ce:inf>-VOPO<ce:inf>4</ce:inf>first appear, and then (VO)<ce:inf>2</ce:inf>P<ce:inf>2</ce:inf>O<ce:inf>7</ce:inf>appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of α<ce:inf>I</ce:inf>-VOPO<ce:inf>4</ce:inf>. When comparing with the classical organic route, catalytic performances are markedly improved when the VOHPO<ce:inf>4</ce:inf>, 0.5H<ce:inf>2</ce:inf>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<ce:sup>5+</ce:sup>) as α<ce:inf>I</ce:inf>-VOPO<ce:inf>4</ce:inf>). 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<ce:inf>4</ce:inf>, 0.5H<ce:inf>2</ce:inf>O is then quite different at variance with what was observed on the same precursor prepared by the classical route of reduction of V<ce:inf>2</ce:inf>O<ce:inf>5</ce:inf>by isobutanol (see B. Abdelouahab<ce:italic>et al</ce:italic>., 1995,<ce:italic>J. Catal.</ce:italic>,<ce:bold>157</ce:bold>, 687. The present study demonstrates that the preparative route for the formation of doped VPO precursors is most important in controlling the VOPO<ce:inf>4</ce:inf>/(VO)<ce:inf>2</ce:inf>P<ce:inf>2</ce:inf>O<ce:inf>7</ce:inf>dispersion and catalytic performance of the final catalyst.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>On the Role of Fe and Co Dopants during the Activation of the VO(HPO4), 0.5 H2O Precursor of the Vanadium Phosphorus Catalyst as Studied by in Situ Laser Raman Spectroscopy</title><subTitle>II. Study of VO(HPO4), 0.5 H2O Precursors Prepared by Reduction of VOPO4, 2 H2O by Isobutanol</subTitle></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>On the Role of Fe and Co Dopants during the Activation of the VO(HPO</title><subTitle>II. Study of VO(HPO4), 0.5 H2O Precursors Prepared by Reduction of VOPO4, 2 H2O by Isobutanol</subTitle></titleInfo><name type="personal"><namePart type="given">M.T.</namePart><namePart type="family">Sananés-Schulz</namePart><affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">F.Ben</namePart><namePart type="family">Abdelouahab</namePart><affiliation>Faculté des Sciences, Université Abdelmalek Essaadi, BP 2121, Tétouan, Morocco</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G.J.</namePart><namePart type="family">Hutchings</namePart><affiliation>Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, United Kingdom</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.C.</namePart><namePart type="family">Volta</namePart><affiliation>Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626, Villeurbanne Cédex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1996</dateIssued><dateModified encoding="w3cdtf">1996-05-15</dateModified><copyrightDate encoding="w3cdtf">1996</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">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 undern-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 byin situlaser Raman spectroscopy. In a first period of the activation, the nucleation of αI-VOPO4is favoured for the undoped VPO precursor, while (VO)2P2O7appears in a second period. For the Co-doped VPO precursor, αI- and αII-VOPO4first appear, and then (VO)2P2O7appears. At variance, the Fe-doped VPO precursor promotes the only nucleation of αI-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 αI-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 V2O5by isobutanol (see B. Abdelouahabet 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)2P2O7dispersion and catalytic performance of the final catalyst.</abstract><note type="content">Section title: Regular Article</note><relatedItem type="host"><titleInfo><title>Journal of Catalysis</title></titleInfo><titleInfo type="abbreviated"><title>YJCAT</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199610</dateIssued></originInfo><identifier type="ISSN">0021-9517</identifier><identifier type="PII">S0021-9517(00)X0088-7</identifier><part><date>199610</date><detail type="volume"><number>163</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>223</start><end>509</end></extent><extent unit="pages"><start>346</start><end>353</end></extent></part></relatedItem><identifier type="istex">66DA8E4FB964503759F079A2260B5F8068DBACA3</identifier><identifier type="DOI">10.1006/jcat.1996.0336</identifier><identifier type="PII">S0021-9517(96)90336-X</identifier><accessCondition type="use and reproduction" contentType="copyright">©1996 Academic Press</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>Academic Press, ©1996</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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