NickelMaghrebV1, France, Analysis, bibRecord, 000359

Niobium sulfide as a dopant for hydrotreating NiMo catalysts

Identifieur interne : 000359 ( France/Analysis ); précédent : 000358; suivant : 000360

Niobium sulfide as a dopant for hydrotreating NiMo catalysts

Auteurs : V. Gaborit [France] ; N. Allali [Maroc] ; C. Geantet [France] ; M. Breysse [France] ; M. Vrinat [France] ; M. Danot [France]

Source :

Catalysis today [ 0920-5861 ] ; 2000.

RBID : Pascal:00-0276393

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Catalyseur mixte, Nickel, Molybdène, Catalyseur modifié, Niobium, Catalyseur sur support, Aluminium Oxyde, Réaction catalytique, Hydrodésulfuration, Hydrogénation, Naphtalène(1,2,3,4-tétrahydro), Composé benzénique condensé, Composé benzénique, Spectrométrie EXAFS, Activité catalytique, Catalyse hétérogène, Dibenzothiophène.
Wicri :
- topic : Nickel, Molybdène.

English descriptors

KwdEn :
- Aluminium Oxides, Benzenic compound, Catalyst activity, Catalytic reaction, Condensed benzenic compound, EXAFS spectrometry, Experimental study, Heterogeneous catalysis, Hydrodesulfurization, Hydrogenation, Mixed catalyst, Modified catalyst, Molybdenum, Naphthalene(1,2,3,4-tetrahydro), Nickel, Niobium, Supported catalyst.

Abstract

Niobium sulfide has been recently found to be an interesting new active phase for hydrodesulfurization. In this work, niobium was used as a dopant for a conventional hydrotreating catalyst. A NiMo hydrotreating catalyst in the oxide form was doped with various contents of Nb precursor salt (02 sulfiding agent in a high pressure vessel. The use of this new dopant increased the catalytic activity in both HDS and HYD model reactions. Highest activities were obtained with an optimum Nb content of 5 wt.%. The selectivity of the products was also modified since more isomerized compounds where produced. Various techniques were used to determine structural and morphological characteristics of the materials. TEM pictures only showed the presence of lamellar particles similar to MoS₂. EDX analysis demonstrated the homogeneous distribution of the transition metal elements (Ni, Mo, Nb) even with small electron probes at high magnification. EXAFS was used to determine the local environment of Nb atoms and showed that Nb was present in the form of "NbS₂" entities similar to the bulk phase.

Affiliations:

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Pascal:00-0276393

Le document en format XML

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<term>Experimental study</term>
<term>Heterogeneous catalysis</term>
<term>Hydrodesulfurization</term>
<term>Hydrogenation</term>
<term>Mixed catalyst</term>
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<term>Catalyseur modifié</term>
<term>Niobium</term>
<term>Catalyseur sur support</term>
<term>Aluminium Oxyde</term>
<term>Réaction catalytique</term>
<term>Hydrodésulfuration</term>
<term>Hydrogénation</term>
<term>Naphtalène(1,2,3,4-tétrahydro)</term>
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<front><div type="abstract" xml:lang="en">Niobium sulfide has been recently found to be an interesting new active phase for hydrodesulfurization. In this work, niobium was used as a dopant for a conventional hydrotreating catalyst. A NiMo hydrotreating catalyst in the oxide form was doped with various contents of Nb precursor salt (0<sub>2</sub>
 sulfiding agent in a high pressure vessel. The use of this new dopant increased the catalytic activity in both HDS and HYD model reactions. Highest activities were obtained with an optimum Nb content of 5 wt.%. The selectivity of the products was also modified since more isomerized compounds where produced. Various techniques were used to determine structural and morphological characteristics of the materials. TEM pictures only showed the presence of lamellar particles similar to MoS<sub>2</sub>
. EDX analysis demonstrated the homogeneous distribution of the transition metal elements (Ni, Mo, Nb) even with small electron probes at high magnification. EXAFS was used to determine the local environment of Nb atoms and showed that Nb was present in the form of "NbS<sub>2</sub>
" entities similar to the bulk phase.</div>
</front>
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Serveur d'exploration sur le nickel au Maghreb

Niobium sulfide as a dopant for hydrotreating NiMo catalysts

Niobium sulfide as a dopant for hydrotreating NiMo catalysts

Source :

Descripteurs français

English descriptors

Abstract

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