Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method
Identifieur interne : 000134 ( France/Analysis ); précédent : 000133; suivant : 000135Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method
Auteurs : F. Ayari [Tunisie] ; M. Mhamdi [Tunisie] ; G. Delahay [France] ; A. Ghorbel [Tunisie]Source :
- Journal of sol-gel science and technology [ 0928-0707 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Ammonioxydation, Ethylène, Acétonitrile, Nitrile, Chrome, Cobalt, Alumine, Catalyseur, Procédé sol gel, Oxyde d'aluminium, Catalyseur sur support, Imprégnation, Propriété physicochimique, Analyse chimique, Physisorption, Diffraction RX, Spectrométrie RMN, Facteur réflexion, Spectrométrie Raman, Réduction chimique, Mésoporosité, Matériau poreux, Aire superficielle, Support, Pore, Xérogel, Aérogel, Etat supercritique, Al2O3, Al O, Co3O4, Co O.
- Wicri :
English descriptors
- KwdEn :
- Acetonitrile, Aerogel, Alumina, Aluminium oxide, Ammoxidation, Catalyst, Chemical analysis, Chemical reduction, Chromium, Cobalt, Ethylene, Impregnation, Mesoporosity, NMR spectrometry, Nitrile, Physicochemical properties, Physisorption, Pore, Porous material, Raman spectrometry, Reflectance, Sol gel process, Supercritical state, Support, Supported catalyst, Surface area, X ray diffraction, Xerogel.
Abstract
A series of Cr/Al2O3 and Co/Al2O3 catalysts were tested in the selective ammoxidation of ethylene to acetonitrile. Catalysts were prepared either by sol-gel method or by impregnation with chromium or cobalt acetylacetonate salts. Physicochemical properties of catalysts were accomplished by several techniques such as chemical analysis, physisorption of N2, X-ray diffraction (XRD), 27Al MAS NMR, UV-Visible diffuse reflectance (DRS) and Raman spectroscopy and temperature programmed reduction of H2 (H2-TPR). Textural analysis reveals that mesoporous materials with pronounced surface areas were obtained using sol-gel procedure while impregnation of the support produces a moderate decrease of its surface area and pore volume. XRD analysis confirms the presence of highly dispersed metal species which reside essentially on the surface and measure less than 4 nm. Furthermore, 27Al MAS NMR shows that for xerogels, part of metal species occupies sites on/in Al2O3 in close vicinity of octahedral 27Al. This, apparently, is not the case for aerogels. For Cr/Al2O3 catalysts, isolated Cr6+, mono and polychromate species were identified using DRS, Raman Spectroscopy and H2-TPR which seem to play a key role in the ammoxidation of ethylene. Furthermore, for cobalt doped catalysts, CoAl2O4 was identified as active phase on the basis of DRS and H2-TPR results. From the supercritical drying, it results generally better catalysts than catalysts calcined by ordinary procedure which leads to inactive agglomerated Co3O4 and COO-Al2O3 phase.
Url:
Affiliations:
- France, Tunisie
- Gouvernorat de Tunis, Languedoc-Roussillon, Occitanie (région administrative)
- Montpellier, Tunis
Links toward previous steps (curation, corpus...)
- to stream PascalFrancis, to step Corpus: 000112
- to stream PascalFrancis, to step Curation: 000183
- to stream PascalFrancis, to step Checkpoint: 000115
- to stream Main, to step Merge: 000726
- to stream Hal, to step Corpus: 000000
- to stream Hal, to step Curation: 000000
- to stream Hal, to step Checkpoint: 000009
- to stream Main, to step Merge: 000653
- to stream Main, to step Curation: 000720
- to stream Main, to step Exploration: 000720
- to stream France, to step Extraction: 000134
Links to Exploration step
Pascal:09-0163243Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method</title><author><name sortKey="Ayari, F" sort="Ayari, F" uniqKey="Ayari F" first="F." last="Ayari">F. Ayari</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Mhamdi, M" sort="Mhamdi, M" uniqKey="Mhamdi M" first="M." last="Mhamdi">M. Mhamdi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Delahay, G" sort="Delahay, G" uniqKey="Delahay G" first="G." last="Delahay">G. Delahay</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut Charles Gerhardt Montpellier, UMR 5253, CNRS-UM2-ENSCM-UM1, Eq. "Matériaux Avancés pour la Catalyse et la Santé" ENSCM (MACS -Site la Galéra), 8, rue Ecole Normale</s1><s2>34296 Montpellier</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement></placeName></affiliation></author><author><name sortKey="Ghorbel, A" sort="Ghorbel, A" uniqKey="Ghorbel A" first="A." last="Ghorbel">A. Ghorbel</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">09-0163243</idno><date when="2009">2009</date><idno type="stanalyst">PASCAL 09-0163243 INIST</idno><idno type="RBID">Pascal:09-0163243</idno><idno type="wicri:Area/PascalFrancis/Corpus">000112</idno><idno type="wicri:Area/PascalFrancis/Curation">000183</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000115</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000115</idno><idno type="wicri:doubleKey">0928-0707:2009:Ayari F:ammoxidation:of:ethylene</idno><idno type="wicri:Area/Main/Merge">000726</idno><idno type="wicri:source">HAL</idno><idno type="RBID">Hal:hal-00352603</idno><idno type="url">https://hal.archives-ouvertes.fr/hal-00352603</idno><idno type="wicri:Area/Hal/Corpus">000000</idno><idno type="wicri:Area/Hal/Curation">000000</idno><idno type="wicri:Area/Hal/Checkpoint">000009</idno><idno type="wicri:explorRef" wicri:stream="Hal" wicri:step="Checkpoint">000009</idno><idno type="wicri:doubleKey">0928-0707:2009:Ayari F:ammoxidation:of:ethylene</idno><idno type="wicri:Area/Main/Merge">000653</idno><idno type="wicri:Area/Main/Curation">000720</idno><idno type="wicri:Area/Main/Exploration">000720</idno><idno type="wicri:Area/France/Extraction">000134</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method</title><author><name sortKey="Ayari, F" sort="Ayari, F" uniqKey="Ayari F" first="F." last="Ayari">F. Ayari</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Mhamdi, M" sort="Mhamdi, M" uniqKey="Mhamdi M" first="M." last="Mhamdi">M. Mhamdi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Delahay, G" sort="Delahay, G" uniqKey="Delahay G" first="G." last="Delahay">G. Delahay</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut Charles Gerhardt Montpellier, UMR 5253, CNRS-UM2-ENSCM-UM1, Eq. "Matériaux Avancés pour la Catalyse et la Santé" ENSCM (MACS -Site la Galéra), 8, rue Ecole Normale</s1><s2>34296 Montpellier</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Languedoc-Roussillon</region><settlement type="city">Montpellier</settlement></placeName></affiliation></author><author><name sortKey="Ghorbel, A" sort="Ghorbel, A" uniqKey="Ghorbel A" first="A." last="Ghorbel">A. Ghorbel</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of sol-gel science and technology</title><title level="j" type="abbreviated">J. sol-gel sci. technol.</title><idno type="ISSN">0928-0707</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of sol-gel science and technology</title><title level="j" type="abbreviated">J. sol-gel sci. technol.</title><idno type="ISSN">0928-0707</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acetonitrile</term><term>Aerogel</term><term>Alumina</term><term>Aluminium oxide</term><term>Ammoxidation</term><term>Catalyst</term><term>Chemical analysis</term><term>Chemical reduction</term><term>Chromium</term><term>Cobalt</term><term>Ethylene</term><term>Impregnation</term><term>Mesoporosity</term><term>NMR spectrometry</term><term>Nitrile</term><term>Physicochemical properties</term><term>Physisorption</term><term>Pore</term><term>Porous material</term><term>Raman spectrometry</term><term>Reflectance</term><term>Sol gel process</term><term>Supercritical state</term><term>Support</term><term>Supported catalyst</term><term>Surface area</term><term>X ray diffraction</term><term>Xerogel</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ammonioxydation</term><term>Ethylène</term><term>Acétonitrile</term><term>Nitrile</term><term>Chrome</term><term>Cobalt</term><term>Alumine</term><term>Catalyseur</term><term>Procédé sol gel</term><term>Oxyde d'aluminium</term><term>Catalyseur sur support</term><term>Imprégnation</term><term>Propriété physicochimique</term><term>Analyse chimique</term><term>Physisorption</term><term>Diffraction RX</term><term>Spectrométrie RMN</term><term>Facteur réflexion</term><term>Spectrométrie Raman</term><term>Réduction chimique</term><term>Mésoporosité</term><term>Matériau poreux</term><term>Aire superficielle</term><term>Support</term><term>Pore</term><term>Xérogel</term><term>Aérogel</term><term>Etat supercritique</term><term>Al2O3</term><term>Al O</term><term>Co3O4</term><term>Co O</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Chrome</term><term>Cobalt</term></keywords><keywords scheme="mix" xml:lang="ro"><term>Acetonitrile</term><term>Alumina</term><term>Ammoxidation</term><term>Chromium</term><term>Cobalt</term><term>Sol–gel</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A series of Cr/Al<sub>2</sub>O<sub>3</sub> and Co/Al<sub>2</sub>O<sub>3</sub> catalysts were tested in the selective ammoxidation of ethylene to acetonitrile. Catalysts were prepared either by sol-gel method or by impregnation with chromium or cobalt acetylacetonate salts. Physicochemical properties of catalysts were accomplished by several techniques such as chemical analysis, physisorption of N<sub>2</sub>, X-ray diffraction (XRD), <sup>27</sup>Al MAS NMR, UV-Visible diffuse reflectance (DRS) and Raman spectroscopy and temperature programmed reduction of H<sub>2</sub> (H<sub>2</sub>-TPR). Textural analysis reveals that mesoporous materials with pronounced surface areas were obtained using sol-gel procedure while impregnation of the support produces a moderate decrease of its surface area and pore volume. XRD analysis confirms the presence of highly dispersed metal species which reside essentially on the surface and measure less than 4 nm. Furthermore, <sup>27</sup>Al MAS NMR shows that for xerogels, part of metal species occupies sites on/in Al<sub>2</sub>O<sub>3</sub> in close vicinity of octahedral <sup>27</sup>Al. This, apparently, is not the case for aerogels. For Cr/Al<sub>2</sub>O<sub>3</sub> catalysts, isolated Cr<sup>6+</sup>, mono and polychromate species were identified using DRS, Raman Spectroscopy and H<sub>2</sub>-TPR which seem to play a key role in the ammoxidation of ethylene. Furthermore, for cobalt doped catalysts, CoAl<sub>2</sub>O<sub>4</sub> was identified as active phase on the basis of DRS and H<sub>2</sub>-TPR results. From the supercritical drying, it results generally better catalysts than catalysts calcined by ordinary procedure which leads to inactive agglomerated Co<sub>3</sub>O<sub>4</sub> and COO-Al<sub>2</sub>O<sub>3</sub> phase.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Gouvernorat de Tunis</li><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Montpellier</li><li>Tunis</li></settlement></list><tree><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Ayari, F" sort="Ayari, F" uniqKey="Ayari F" first="F." last="Ayari">F. Ayari</name></region><name sortKey="Ghorbel, A" sort="Ghorbel, A" uniqKey="Ghorbel A" first="A." last="Ghorbel">A. Ghorbel</name><name sortKey="Mhamdi, M" sort="Mhamdi, M" uniqKey="Mhamdi M" first="M." last="Mhamdi">M. Mhamdi</name></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Delahay, G" sort="Delahay, G" uniqKey="Delahay G" first="G." last="Delahay">G. Delahay</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/CobaltMaghrebV1/Data/France/Analysis
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000134 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/France/Analysis/biblio.hfd -nk 000134 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Terre
|area= CobaltMaghrebV1
|flux= France
|étape= Analysis
|type= RBID
|clé= Pascal:09-0163243
|texte= Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method
}}
| This area was generated with Dilib version V0.6.32. |  |