CobaltMaghrebV1, PascalFrancis, Corpus, bibRecord, 000112

Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method

Identifieur interne : 000112 ( PascalFrancis/Corpus ); précédent : 000111; suivant : 000113

Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method

Auteurs : F. Ayari ; M. Mhamdi ; G. Delahay ; A. Ghorbel

Source :

Journal of sol-gel science and technology [ 0928-0707 ] ; 2009.

RBID : Pascal:09-0163243

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.

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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A14	`02`			`@1 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 @2 34296 Montpellier @3 FRA @Z 3 aut.`
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C01	`01`		`ENG`	@0 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.
C02	`01`	`X`		`@0 001C01J05`
C02	`02`	`X`		`@0 001C01A03`
C02	`03`	`X`		`@0 001C01J08`
C03	`01`	`X`	`FRE`	`@0 Ammonioxydation @5 01`
C03	`01`	`X`	`ENG`	`@0 Ammoxidation @5 01`
C03	`01`	`X`	`SPA`	`@0 Amonioxidación @5 01`
C03	`02`	`X`	`FRE`	`@0 Ethylène @2 NK @2 FX @5 02`
C03	`02`	`X`	`ENG`	`@0 Ethylene @2 NK @2 FX @5 02`
C03	`02`	`X`	`SPA`	`@0 Etileno @2 NK @2 FX @5 02`
C03	`03`	`X`	`FRE`	`@0 Acétonitrile @2 NK @5 03`
C03	`03`	`X`	`ENG`	`@0 Acetonitrile @2 NK @5 03`
C03	`03`	`X`	`SPA`	`@0 Acetonitrilo @2 NK @5 03`
C03	`04`	`X`	`FRE`	`@0 Nitrile @5 04`
C03	`04`	`X`	`ENG`	`@0 Nitrile @5 04`
C03	`04`	`X`	`SPA`	`@0 Nitrilo @5 04`
C03	`05`	`X`	`FRE`	`@0 Chrome @2 NC @2 FX @5 05`
C03	`05`	`X`	`ENG`	`@0 Chromium @2 NC @2 FX @5 05`
C03	`05`	`X`	`SPA`	`@0 Cromo @2 NC @2 FX @5 05`
C03	`06`	`X`	`FRE`	`@0 Cobalt @2 NC @5 06`
C03	`06`	`X`	`ENG`	`@0 Cobalt @2 NC @5 06`
C03	`06`	`X`	`SPA`	`@0 Cobalto @2 NC @5 06`
C03	`07`	`X`	`FRE`	`@0 Alumine @2 NK @5 07`
C03	`07`	`X`	`ENG`	`@0 Alumina @2 NK @5 07`
C03	`07`	`X`	`SPA`	`@0 Alúmina @2 NK @5 07`
C03	`08`	`X`	`FRE`	`@0 Catalyseur @5 08`
C03	`08`	`X`	`ENG`	`@0 Catalyst @5 08`
C03	`08`	`X`	`SPA`	`@0 Catalizador @5 08`
C03	`09`	`X`	`FRE`	`@0 Procédé sol gel @5 09`
C03	`09`	`X`	`ENG`	`@0 Sol gel process @5 09`
C03	`09`	`X`	`SPA`	`@0 Procedimiento sol gel @5 09`
C03	`10`	`X`	`FRE`	`@0 Oxyde d'aluminium @5 12`
C03	`10`	`X`	`ENG`	`@0 Aluminium oxide @5 12`
C03	`10`	`X`	`SPA`	`@0 Aluminio óxido @5 12`
C03	`11`	`X`	`FRE`	`@0 Catalyseur sur support @5 13`
C03	`11`	`X`	`ENG`	`@0 Supported catalyst @5 13`
C03	`11`	`X`	`SPA`	`@0 Catalizador sobre soporte @5 13`
C03	`12`	`X`	`FRE`	`@0 Imprégnation @5 14`
C03	`12`	`X`	`ENG`	`@0 Impregnation @5 14`
C03	`12`	`X`	`SPA`	`@0 Impregnación @5 14`
C03	`13`	`X`	`FRE`	`@0 Propriété physicochimique @5 15`
C03	`13`	`X`	`ENG`	`@0 Physicochemical properties @5 15`
C03	`13`	`X`	`SPA`	`@0 Propiedad fisicoquímica @5 15`
C03	`14`	`X`	`FRE`	`@0 Analyse chimique @5 16`
C03	`14`	`X`	`ENG`	`@0 Chemical analysis @5 16`
C03	`14`	`X`	`SPA`	`@0 Análisis químico @5 16`
C03	`15`	`X`	`FRE`	`@0 Physisorption @5 17`
C03	`15`	`X`	`ENG`	`@0 Physisorption @5 17`
C03	`15`	`X`	`SPA`	`@0 Fisisorción @5 17`
C03	`16`	`X`	`FRE`	`@0 Diffraction RX @5 18`
C03	`16`	`X`	`ENG`	`@0 X ray diffraction @5 18`
C03	`16`	`X`	`SPA`	`@0 Difracción RX @5 18`
C03	`17`	`X`	`FRE`	`@0 Spectrométrie RMN @5 19`
C03	`17`	`X`	`ENG`	`@0 NMR spectrometry @5 19`
C03	`17`	`X`	`SPA`	`@0 Espectrometría RMN @5 19`
C03	`18`	`X`	`FRE`	`@0 Facteur réflexion @5 20`
C03	`18`	`X`	`ENG`	`@0 Reflectance @5 20`
C03	`18`	`X`	`SPA`	`@0 Coeficiente reflexión @5 20`
C03	`19`	`X`	`FRE`	`@0 Spectrométrie Raman @5 21`
C03	`19`	`X`	`ENG`	`@0 Raman spectrometry @5 21`
C03	`19`	`X`	`SPA`	`@0 Espectrometría Raman @5 21`
C03	`20`	`X`	`FRE`	`@0 Réduction chimique @5 22`
C03	`20`	`X`	`ENG`	`@0 Chemical reduction @5 22`
C03	`20`	`X`	`SPA`	`@0 Reducción química @5 22`
C03	`21`	`X`	`FRE`	`@0 Mésoporosité @5 23`
C03	`21`	`X`	`ENG`	`@0 Mesoporosity @5 23`
C03	`21`	`X`	`SPA`	`@0 Mesoporosidad @5 23`
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C03	`25`	`X`	`ENG`	`@0 Pore @5 27`
C03	`25`	`X`	`SPA`	`@0 Poro @5 27`
C03	`26`	`X`	`FRE`	`@0 Xérogel @5 28`
C03	`26`	`X`	`ENG`	`@0 Xerogel @5 28`
C03	`26`	`X`	`SPA`	`@0 Xerogel @5 28`
C03	`27`	`X`	`FRE`	`@0 Aérogel @5 29`
C03	`27`	`X`	`ENG`	`@0 Aerogel @5 29`
C03	`27`	`X`	`SPA`	`@0 Aerógel @5 29`
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C03	`28`	`X`	`SPA`	`@0 Estado supercrítico @5 30`
C03	`29`	`X`	`FRE`	`@0 Al2O3 @4 INC @5 32`
C03	`30`	`X`	`FRE`	`@0 Al O @4 INC @5 33`
C03	`31`	`X`	`FRE`	`@0 Co3O4 @4 INC @5 34`
C03	`32`	`X`	`FRE`	`@0 Co O @4 INC @5 35`
C07	`01`	`X`	`FRE`	`@0 Métal transition @2 NC @5 10`
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C07	`01`	`X`	`SPA`	`@0 Metal transición @2 NC @5 10`
C07	`02`	`X`	`FRE`	`@0 Composé binaire @5 11`
C07	`02`	`X`	`ENG`	`@0 Binary compound @5 11`
C07	`02`	`X`	`SPA`	`@0 Compuesto binario @5 11`
N21				`@1 117`
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Format Inist (serveur)

NO :	PASCAL 09-0163243 INIST
ET :	Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method
AU :	AYARI (F.); MHAMDI (M.); DELAHAY (G.); GHORBEL (A.)
AF :	Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar/2092 Tunis/Tunisie (1 aut., 2 aut., 4 aut.); 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/34296 Montpellier/France (3 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of sol-gel science and technology; ISSN 0928-0707; Allemagne; Da. 2009; Vol. 49; No. 2; Pp. 170-179; Bibl. 66 ref.
LA :	Anglais
EA :	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.
CC :	001C01J05; 001C01A03; 001C01J08
FD :	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
FG :	Métal transition; Composé binaire
ED :	Ammoxidation; Ethylene; Acetonitrile; Nitrile; Chromium; Cobalt; Alumina; Catalyst; Sol gel process; Aluminium oxide; Supported catalyst; Impregnation; Physicochemical properties; Chemical analysis; Physisorption; X ray diffraction; NMR spectrometry; Reflectance; Raman spectrometry; Chemical reduction; Mesoporosity; Porous material; Surface area; Support; Pore; Xerogel; Aerogel; Supercritical state
EG :	Transition metal; Binary compound
SD :	Amonioxidación; Etileno; Acetonitrilo; Nitrilo; Cromo; Cobalto; Alúmina; Catalizador; Procedimiento sol gel; Aluminio óxido; Catalizador sobre soporte; Impregnación; Propiedad fisicoquímica; Análisis químico; Fisisorción; Difracción RX; Espectrometría RMN; Coeficiente reflexión; Espectrometría Raman; Reducción química; Mesoporosidad; Material poroso; Area superficial; Soporte; Poro; Xerogel; Aerógel; Estado supercrítico
LO :	INIST-26574.354000187053020070
ID :	09-0163243

Links to Exploration step

Pascal:09-0163243

Le document en format XML

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<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>
</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>
<inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0928-0707</s0>
</fA01>
<fA03 i2="1"><s0>J. sol-gel sci. technol.</s0>
</fA03>
<fA05><s2>49</s2>
</fA05>
<fA06><s2>2</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>AYARI (F.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>MHAMDI (M.)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>DELAHAY (G.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>GHORBEL (A.)</s1>
</fA11>
<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>
</fA14>
<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>
</fA14>
<fA20><s1>170-179</s1>
</fA20>
<fA21><s1>2009</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>26574</s2>
<s5>354000187053020070</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2009 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>66 ref.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>09-0163243</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of sol-gel science and technology</s0>
</fA64>
<fA66 i1="01"><s0>DEU</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>001C01J05</s0>
</fC02>
<fC02 i1="02" i2="X"><s0>001C01A03</s0>
</fC02>
<fC02 i1="03" i2="X"><s0>001C01J08</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Ammonioxydation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Ammoxidation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Amonioxidación</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Ethylène</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Ethylene</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Etileno</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Acétonitrile</s0>
<s2>NK</s2>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Acetonitrile</s0>
<s2>NK</s2>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Acetonitrilo</s0>
<s2>NK</s2>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Nitrile</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Nitrile</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Nitrilo</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Chrome</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Chromium</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Cromo</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Cobalto</s0>
<s2>NC</s2>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Alumine</s0>
<s2>NK</s2>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Alumina</s0>
<s2>NK</s2>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Alúmina</s0>
<s2>NK</s2>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Catalyseur</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Catalyst</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Catalizador</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Procédé sol gel</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Sol gel process</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Procedimiento sol gel</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Oxyde d'aluminium</s0>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Aluminium oxide</s0>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Aluminio óxido</s0>
<s5>12</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Catalyseur sur support</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Supported catalyst</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Catalizador sobre soporte</s0>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Imprégnation</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Impregnation</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Impregnación</s0>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Propriété physicochimique</s0>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Physicochemical properties</s0>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Propiedad fisicoquímica</s0>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Analyse chimique</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Chemical analysis</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Análisis químico</s0>
<s5>16</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Physisorption</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Physisorption</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Fisisorción</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Diffraction RX</s0>
<s5>18</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>X ray diffraction</s0>
<s5>18</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Difracción RX</s0>
<s5>18</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Spectrométrie RMN</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG"><s0>NMR spectrometry</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA"><s0>Espectrometría RMN</s0>
<s5>19</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Facteur réflexion</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Reflectance</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Coeficiente reflexión</s0>
<s5>20</s5>
</fC03>
<fC03 i1="19" i2="X" l="FRE"><s0>Spectrométrie Raman</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="X" l="ENG"><s0>Raman spectrometry</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="X" l="SPA"><s0>Espectrometría Raman</s0>
<s5>21</s5>
</fC03>
<fC03 i1="20" i2="X" l="FRE"><s0>Réduction chimique</s0>
<s5>22</s5>
</fC03>
<fC03 i1="20" i2="X" l="ENG"><s0>Chemical reduction</s0>
<s5>22</s5>
</fC03>
<fC03 i1="20" i2="X" l="SPA"><s0>Reducción química</s0>
<s5>22</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Mésoporosité</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>Mesoporosity</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Mesoporosidad</s0>
<s5>23</s5>
</fC03>
<fC03 i1="22" i2="X" l="FRE"><s0>Matériau poreux</s0>
<s5>24</s5>
</fC03>
<fC03 i1="22" i2="X" l="ENG"><s0>Porous material</s0>
<s5>24</s5>
</fC03>
<fC03 i1="22" i2="X" l="SPA"><s0>Material poroso</s0>
<s5>24</s5>
</fC03>
<fC03 i1="23" i2="X" l="FRE"><s0>Aire superficielle</s0>
<s5>25</s5>
</fC03>
<fC03 i1="23" i2="X" l="ENG"><s0>Surface area</s0>
<s5>25</s5>
</fC03>
<fC03 i1="23" i2="X" l="SPA"><s0>Area superficial</s0>
<s5>25</s5>
</fC03>
<fC03 i1="24" i2="X" l="FRE"><s0>Support</s0>
<s5>26</s5>
</fC03>
<fC03 i1="24" i2="X" l="ENG"><s0>Support</s0>
<s5>26</s5>
</fC03>
<fC03 i1="24" i2="X" l="SPA"><s0>Soporte</s0>
<s5>26</s5>
</fC03>
<fC03 i1="25" i2="X" l="FRE"><s0>Pore</s0>
<s5>27</s5>
</fC03>
<fC03 i1="25" i2="X" l="ENG"><s0>Pore</s0>
<s5>27</s5>
</fC03>
<fC03 i1="25" i2="X" l="SPA"><s0>Poro</s0>
<s5>27</s5>
</fC03>
<fC03 i1="26" i2="X" l="FRE"><s0>Xérogel</s0>
<s5>28</s5>
</fC03>
<fC03 i1="26" i2="X" l="ENG"><s0>Xerogel</s0>
<s5>28</s5>
</fC03>
<fC03 i1="26" i2="X" l="SPA"><s0>Xerogel</s0>
<s5>28</s5>
</fC03>
<fC03 i1="27" i2="X" l="FRE"><s0>Aérogel</s0>
<s5>29</s5>
</fC03>
<fC03 i1="27" i2="X" l="ENG"><s0>Aerogel</s0>
<s5>29</s5>
</fC03>
<fC03 i1="27" i2="X" l="SPA"><s0>Aerógel</s0>
<s5>29</s5>
</fC03>
<fC03 i1="28" i2="X" l="FRE"><s0>Etat supercritique</s0>
<s5>30</s5>
</fC03>
<fC03 i1="28" i2="X" l="ENG"><s0>Supercritical state</s0>
<s5>30</s5>
</fC03>
<fC03 i1="28" i2="X" l="SPA"><s0>Estado supercrítico</s0>
<s5>30</s5>
</fC03>
<fC03 i1="29" i2="X" l="FRE"><s0>Al2O3</s0>
<s4>INC</s4>
<s5>32</s5>
</fC03>
<fC03 i1="30" i2="X" l="FRE"><s0>Al O</s0>
<s4>INC</s4>
<s5>33</s5>
</fC03>
<fC03 i1="31" i2="X" l="FRE"><s0>Co3O4</s0>
<s4>INC</s4>
<s5>34</s5>
</fC03>
<fC03 i1="32" i2="X" l="FRE"><s0>Co O</s0>
<s4>INC</s4>
<s5>35</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Métal transition</s0>
<s2>NC</s2>
<s5>10</s5>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Transition metal</s0>
<s2>NC</s2>
<s5>10</s5>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Metal transición</s0>
<s2>NC</s2>
<s5>10</s5>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Composé binaire</s0>
<s5>11</s5>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Binary compound</s0>
<s5>11</s5>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Compuesto binario</s0>
<s5>11</s5>
</fC07>
<fN21><s1>117</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 09-0163243 INIST</NO>
<ET>Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method</ET>
<AU>AYARI (F.); MHAMDI (M.); DELAHAY (G.); GHORBEL (A.)</AU>
<AF>Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire Tunis ElManar/2092 Tunis/Tunisie (1 aut., 2 aut., 4 aut.); 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/34296 Montpellier/France (3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of sol-gel science and technology; ISSN 0928-0707; Allemagne; Da. 2009; Vol. 49; No. 2; Pp. 170-179; Bibl. 66 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>001C01J05; 001C01A03; 001C01J08</CC>
<FD>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</FD>
<FG>Métal transition; Composé binaire</FG>
<ED>Ammoxidation; Ethylene; Acetonitrile; Nitrile; Chromium; Cobalt; Alumina; Catalyst; Sol gel process; Aluminium oxide; Supported catalyst; Impregnation; Physicochemical properties; Chemical analysis; Physisorption; X ray diffraction; NMR spectrometry; Reflectance; Raman spectrometry; Chemical reduction; Mesoporosity; Porous material; Surface area; Support; Pore; Xerogel; Aerogel; Supercritical state</ED>
<EG>Transition metal; Binary compound</EG>
<SD>Amonioxidación; Etileno; Acetonitrilo; Nitrilo; Cromo; Cobalto; Alúmina; Catalizador; Procedimiento sol gel; Aluminio óxido; Catalizador sobre soporte; Impregnación; Propiedad fisicoquímica; Análisis químico; Fisisorción; Difracción RX; Espectrometría RMN; Coeficiente reflexión; Espectrometría Raman; Reducción química; Mesoporosidad; Material poroso; Area superficial; Soporte; Poro; Xerogel; Aerógel; Estado supercrítico</SD>
<LO>INIST-26574.354000187053020070</LO>
<ID>09-0163243</ID>
</server>
</inist>
</record>

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Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method

Ammoxidation of ethylene to acetonitrile over chromium or cobalt alumina catalysts prepared by sol-gel method

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