On the performance of a highly loaded Co/SiO2 catalyst in the gas phase hydrogenation of crotonaldehyde thermal treatments: catalyst structure-selectivity relationship
Identifieur interne : 000941 ( Main/Exploration ); précédent : 000940; suivant : 000942On the performance of a highly loaded Co/SiO2 catalyst in the gas phase hydrogenation of crotonaldehyde thermal treatments: catalyst structure-selectivity relationship
Auteurs : F. Djerboua [Algérie] ; D. Benachour [Algérie] ; R. Touroude [France]Source :
- Applied catalysis. A, General [ 0926-860X ] ; 2005.
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Abstract
This paper reports on the performance and its relation with the structure of a highly loaded (41 wt.%) Co/SiO2 catalyst in the gas phase hydrogenation of crotonaldehyde when varying the thermal treatments to which the catalyst precursor has been subjected. The optimum calcination and reduction temperatures were identified where the highest selectivity to crotyl alcohol (around 90%) was obtained with the catalyst calcined at 400 °C and reduced at 350 °C even at conversions as high as 60%. Higher temperature of calcination was found to lower the crotyl alcohol selectivity. Both, lower and higher reduction temperatures will not favour the crotyl alcohol formation. These results were interpreted and correlated with the surface structure of the catalyst which was shown by temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) analysis. Depending on the thermal conditions imposed, the surface consisted of either Co metal, or coexisting metal and its oxide; structure which favours the high crotyl alcohol selectivity. By TEM analysis, large particles (diameter exceeding 50 nm) were identified after reduction at 350 °C. A global activation energy of 44 kJ/mol was obtained with this catalyst. In the light of the obtained results a discussion on the reaction mechanism involving metal, metal-oxide double sites has been put forward. It was emphasised that, for selective hydrogenation of crotonaldehyde into unsaturated alcohol, Co catalysts compete favourably with platinum based catalysts.
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Touroude</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>LMSPC, UMR 7515 du CNRS ECPM.ULP, 25 rue Becquerel</s1><s2>67087 Strasbourg</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">05-0170318</idno><date when="2005">2005</date><idno type="stanalyst">PASCAL 05-0170318 INIST</idno><idno type="RBID">Pascal:05-0170318</idno><idno type="wicri:Area/PascalFrancis/Corpus">000194</idno><idno type="wicri:Area/PascalFrancis/Curation">000101</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000182</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000182</idno><idno type="wicri:doubleKey">0926-860X:2005:Djerboua F:on:the:performance</idno><idno type="wicri:Area/Main/Merge">000952</idno><idno type="wicri:Area/Main/Curation">000941</idno><idno type="wicri:Area/Main/Exploration">000941</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">On the performance of a highly loaded Co/SiO<sub>2</sub> catalyst in the gas phase hydrogenation of crotonaldehyde thermal treatments: catalyst structure-selectivity relationship</title><author><name sortKey="Djerboua, F" sort="Djerboua, F" uniqKey="Djerboua F" first="F." last="Djerboua">F. Djerboua</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Département de Génie des Procédés, Faculté des Sciences de l'ingénieur, Université Ferhat Abbas, route de Maaboudah</s1><s2>Setif 19000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Setif 19000</wicri:noRegion></affiliation></author><author><name sortKey="Benachour, D" sort="Benachour, D" uniqKey="Benachour D" first="D." last="Benachour">D. Benachour</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Département de Génie des Procédés, Faculté des Sciences de l'ingénieur, Université Ferhat Abbas, route de Maaboudah</s1><s2>Setif 19000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Setif 19000</wicri:noRegion></affiliation></author><author><name sortKey="Touroude, R" sort="Touroude, R" uniqKey="Touroude R" first="R." last="Touroude">R. Touroude</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>LMSPC, UMR 7515 du CNRS ECPM.ULP, 25 rue Becquerel</s1><s2>67087 Strasbourg</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></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="2005">2005</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>Alcohol</term><term>Catalyst</term><term>Catalyst selectivity</term><term>Cobalt</term><term>Gas phase</term><term>Heterogeneous catalysis</term><term>Hydrogenation</term><term>Oxides</term><term>Silica</term><term>Structure</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Silice</term><term>Catalyseur</term><term>Phase gazeuse</term><term>Hydrogénation</term><term>Sélectivité catalyseur</term><term>Structure</term><term>Alcool</term><term>Oxyde</term><term>Catalyse hétérogène</term><term>Cobalt</term><term>But-2-énal</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Alcool</term><term>Oxyde</term><term>Cobalt</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This paper reports on the performance and its relation with the structure of a highly loaded (41 wt.%) Co/SiO<sub>2</sub> catalyst in the gas phase hydrogenation of crotonaldehyde when varying the thermal treatments to which the catalyst precursor has been subjected. The optimum calcination and reduction temperatures were identified where the highest selectivity to crotyl alcohol (around 90%) was obtained with the catalyst calcined at 400 °C and reduced at 350 °C even at conversions as high as 60%. Higher temperature of calcination was found to lower the crotyl alcohol selectivity. Both, lower and higher reduction temperatures will not favour the crotyl alcohol formation. These results were interpreted and correlated with the surface structure of the catalyst which was shown by temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) analysis. Depending on the thermal conditions imposed, the surface consisted of either Co metal, or coexisting metal and its oxide; structure which favours the high crotyl alcohol selectivity. By TEM analysis, large particles (diameter exceeding 50 nm) were identified after reduction at 350 °C. A global activation energy of 44 kJ/mol was obtained with this catalyst. In the light of the obtained results a discussion on the reaction mechanism involving metal, metal-oxide double sites has been put forward. It was emphasised that, for selective hydrogenation of crotonaldehyde into unsaturated alcohol, Co catalysts compete favourably with platinum based catalysts.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li></region><settlement><li>Strasbourg</li></settlement></list><tree><country name="Algérie"><noRegion><name sortKey="Djerboua, F" sort="Djerboua, F" uniqKey="Djerboua F" first="F." last="Djerboua">F. Djerboua</name></noRegion><name sortKey="Benachour, D" sort="Benachour, D" uniqKey="Benachour D" first="D." last="Benachour">D. Benachour</name></country><country name="France"><region name="Grand Est"><name sortKey="Touroude, R" sort="Touroude, R" uniqKey="Touroude R" first="R." last="Touroude">R. 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