CobaltMaghrebV1, France, Analysis, bibRecord, 000267

Titania-Supported Cobalt and Cobalt–Phosphorus Catalysts: Characterization and Performances in Ethane Oxidative Dehydrogenation

Identifieur interne : 000267 ( France/Analysis ); précédent : 000266; suivant : 000268

Titania-Supported Cobalt and Cobalt–Phosphorus Catalysts: Characterization and Performances in Ethane Oxidative Dehydrogenation

Auteurs : Younes Brik [Maroc] ; Mohamed Kacimi [Maroc] ; Mahfoud Ziyad [Maroc] ; François Bozon-Verduraz [France]

Source :

Journal of Catalysis [ 0021-9517 ] ; 2001.

RBID : ISTEX:5E4B0C11F0F91CC04A1D0BD495507FCBC5C62515

Descripteurs français

Pascal (Inist)
- Activité catalytique, Alcane, Calcination, Catalyse hétérogène, Catalyseur sur support, Cobalt, Cobalt Phosphore, Diffraction RX, Déshydrogénation, Ethane, Etude expérimentale, Hydrocarbure, Imprégnation, Oxydation, Préparation, Réaction catalytique, Réflexion diffuse, Spectre Raman, Spectrométrie photoélectron, Titane Oxyde.
Wicri :
- topic : Cobalt, Hydrocarbure.

English descriptors

KwdEn :
- Alkane, Calcining, Catalyst activity, Catalytic reaction, Cobalt, Cobalt Phosphorus, Dehydrogenation, Diffuse reflection, Ethane, Experimental study, Heterogeneous catalysis, Hydrocarbon, Impregnation, Oxidation, Photoelectron spectrometry, Preparation, Raman spectrum, Supported catalyst, Titanium Oxides, X ray diffraction, XPS, cobalt–TiO2 catalysts, ethane oxidative dehydrogenation, in situ diffuse reflectance spectroscopy, laser Raman spectroscopy, phosphorus–cobalt–TiO2 catalysts.

Abstract

TiO2-supported Cobalt and cobalt–phosphorus catalysts prepared by impregnation are characterized by XRD, XPS, Laser Raman Spectroscopy (LRS), and Diffuse Reflectance Spectroscopy (DRS) and investigated in ethane oxidative dehydrogenation (ODH). At low cobalt loadings, the carrier is essentially covered by octahedral Co2+ ions, whereas at concentrations superior to 3.7 wt% formation of the Co3O4 spinel is observed. The best performance in ethane ODH is achieved at 550°C with the sample containing 7.6 wt% Co. The reaction begins with a conversion of 33% and a selectivity around 75%, then it decreases to reach after 150 min on stream a stationary state at 22% of conversion and 60% selectivity. This loss of 30% of the initial activity may be associated with a decrease of the specific surface area and the concomitant formation of CoTiO3 and Co2TiO4, as revealed by LRS, in situ DRS, and XPS analysis. The activity in ethane ODH seems to be mainly related to the presence of Co2+ ions octahedral sites. Addition of phosphorus to Co(7.6)/TiO2 catalysts results in the reduction of Co3+ ions and a growth of amorphous cobalt–phosphorus compounds which provoke a severe decrease of the catalyst performance.

Url:

https://api.istex.fr/document/5E4B0C11F0F91CC04A1D0BD495507FCBC5C62515/fulltext/pdf

DOI: 10.1006/jcat.2001.3262

Affiliations:

Links to Exploration step

ISTEX:5E4B0C11F0F91CC04A1D0BD495507FCBC5C62515

Le document en format XML

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<term>Cobalt Phosphorus</term>
<term>Dehydrogenation</term>
<term>Diffuse reflection</term>
<term>Ethane</term>
<term>Experimental study</term>
<term>Heterogeneous catalysis</term>
<term>Hydrocarbon</term>
<term>Impregnation</term>
<term>Oxidation</term>
<term>Photoelectron spectrometry</term>
<term>Preparation</term>
<term>Raman spectrum</term>
<term>Supported catalyst</term>
<term>Titanium Oxides</term>
<term>X ray diffraction</term>
<term>XPS</term>
<term>cobalt–TiO2 catalysts</term>
<term>ethane oxidative dehydrogenation</term>
<term>in situ diffuse reflectance spectroscopy</term>
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<term>Cobalt Phosphore</term>
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<term>Etude expérimentale</term>
<term>Hydrocarbure</term>
<term>Imprégnation</term>
<term>Oxydation</term>
<term>Préparation</term>
<term>Réaction catalytique</term>
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<front><div type="abstract" xml:lang="en">TiO2-supported Cobalt and cobalt–phosphorus catalysts prepared by impregnation are characterized by XRD, XPS, Laser Raman Spectroscopy (LRS), and Diffuse Reflectance Spectroscopy (DRS) and investigated in ethane oxidative dehydrogenation (ODH). At low cobalt loadings, the carrier is essentially covered by octahedral Co2+ ions, whereas at concentrations superior to 3.7 wt% formation of the Co3O4 spinel is observed. The best performance in ethane ODH is achieved at 550°C with the sample containing 7.6 wt% Co. The reaction begins with a conversion of 33% and a selectivity around 75%, then it decreases to reach after 150 min on stream a stationary state at 22% of conversion and 60% selectivity. This loss of 30% of the initial activity may be associated with a decrease of the specific surface area and the concomitant formation of CoTiO3 and Co2TiO4, as revealed by LRS, in situ DRS, and XPS analysis. The activity in ethane ODH seems to be mainly related to the presence of Co2+ ions octahedral sites. Addition of phosphorus to Co(7.6)/TiO2 catalysts results in the reduction of Co3+ ions and a growth of amorphous cobalt–phosphorus compounds which provoke a severe decrease of the catalyst performance.</div>
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Serveur d'exploration sur le cobalt au Maghreb

Titania-Supported Cobalt and Cobalt–Phosphorus Catalysts: Characterization and Performances in Ethane Oxidative Dehydrogenation

Titania-Supported Cobalt and Cobalt–Phosphorus Catalysts: Characterization and Performances in Ethane Oxidative Dehydrogenation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

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Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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