Supported rhenium sulfide catalysts in thiophene and 4,6-dimethyldibenzothiophene hydrodesulfurization: Effect of acidity of the support over activities

Sepúlveda, Catherine; Belliere, V.; Laurenti, D.; Escalona, N.; Garcı́a, R.; Geantet, Christophe; Vrinat, M.

doi:10.1016/j.apcata.2010.12.008

Cited by 21 publications

(14 citation statements)

References 24 publications

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“…In a previous paper [7], these catalysts were evaluated for hydrodesulfurization of thiophene at atmospheric pressure and 4,6-DMDBT under high H 2 pressure. It was observed that the differences between alumina and silicasupported catalysts in thiophene HDS were less pronounced than for 4,6-DMDBT HDS.…”

Section: Discussionmentioning

confidence: 99%

“…It must be noted that variations in activities are more pronounced in the 4,6-DMDBT hydrodesulfurization than previously observed in thiophene HDS [7]. Therefore, these results could be re-examined in relation to the mechanism of transformation of both molecules.…”

Section: Hydrodesulfurization Of 46-dmdbtmentioning

confidence: 99%

“…The high activity of rhenium sulfide in HDS was first pointed out by Pecoraro and Chianelli [6]. Recently, Sepúlveda et al [7] reported the influence of the support acidity on HDS activity; in particular, the very high conversion obtained for a ReS 2 /SiO 2 catalyst in HDS of 4,6-dimethyldibenzothiophene as compared to ReS 2 / Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 96%

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Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS2/Al2O3 and ReS2/SiO2 Catalysts

et al. 2011

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Rhenium sulfide based catalysts were prepared by the incipient wetness impregnation method over alumina and silica supports and evaluated for 4,6-dimethyldibenzothiophene hydrodesulfurization in a high-pressure stirred-tank reactor. The catalyst prepared over silica was about six times more active for hydrodesulfurization than the corresponding catalyst prepared over alumina and a NiMo/Al 2 O 3 industrial reference catalyst. This surprising and positive SiO 2 support effect was explained by a metallic character of the supported sulfide, which was demonstrated using a kinetic approach of competitive hydrogenations and by XPS characterization.

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Section: Discussionmentioning

confidence: 99%

Section: Hydrodesulfurization Of 46-dmdbtmentioning

confidence: 99%

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Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS2/Al2O3 and ReS2/SiO2 Catalysts

et al. 2011

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“…Its HDS activity is positive correlation to the carrier's ratio of silica to aluminium, i.e., the acidity of the catalyst plays an inhibitory role for HDS activity [7], but oppositely for traditional HDS catalysts [28,37].…”

Section: Othersmentioning

confidence: 99%

“…It is essential to optimize its kinds and content in the process of catalyst preparation [13][14][15][16][17][18][19][20][21][22]. The available carriers in HDS catalyst are as the following types ac-cording to the chemical compositions: silicon-aluminum molecular sieves [23,24], metallic oxides [25,26], mesoporous silica molecular sieves [10,11,27,28] and composites made up by these materials [7,8,23,26]. The most significant characteristics of carriers are its ability to disperse metal and possession of B, L type acids.…”

Section: Introductionmentioning

confidence: 99%

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Liu¹,

Zhang²,

Jiang³

et al. 2013

ACES

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This paper describes the influences of active metal, promoter and chelating agent on the properties of hydro-desulfurization catalyst. The use of chelating agent, especially its combination with common promoters e.g., EDTA-P, has an important meaning to develop highly active catalyst, specifically to unify the active metal dispersion degree and sulfurization degree in some extent, however, they are contradictory in conventional cognition. In the aspect of carriers, composition and nanometer carriers have more excellent performances in acidity, pores structure and metal-carrier interaction than common carriers, and are the developing trend in the future and should be a breakthrough mainly in preparation methods. We also pointed out the decisive factors to improve the activity of the catalyst: higher sulfurization degree of active metal oxide and higher aspect ratios of active phase crystal morphology, and the proper acidity and pores structure can be considered the key factors for deep desulfurization whose mainly obstacle is the desulfurization of large rigid molecules, e.g., dibenzothiophene and 4, 6-dimethyl substituted dibenzothiophene. Based on above that, We discussed the suitable hydrodesulfurization (HDS) catalyst for coal tar, aiming at providing some theoretical guidance for the "design" of coal tar HDS catalyst.

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Niobium‐Based Nickel–Tungsten Hydrotreatment Catalysts with Enhanced Isomerization Properties

et al. 2014

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Alumina‐supported NiW catalysts doped with Nb were prepared with different W contents and different Ni/W ratios. Studies of the sulfide state by TEM and X‐ray photoelectron spectroscopy (XPS) demonstrated the influence of Nb on the sulfidation of W and Ni. The catalytic performance of the solids was evaluated in toluene hydrogenation and cyclohexane isomerization and was compared to that of Nb‐free catalysts. The presence of Nb resulted in a decrease of the hydrogenation activity at low W content and low Ni/W ratio, in agreement with XPS and TEM characterizations. However, increasing the W content and the Ni/W ratio increased the hydrogenation activity. Regardless of the W and Ni content, cyclohexane conversion was significantly improved by the presence of Nb. The most efficient catalyst of the series, with a W content of 15 wt % WO3 and a Ni/W ratio of 0.9, showed slightly higher activity for hydrogenation than that of a Nb‐free NiW catalyst. Also, the isomerization activity was greatly enhanced, demonstrating the potential of these Nb‐based catalyst formulations.

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Supported rhenium sulfide catalysts in thiophene and 4,6-dimethyldibenzothiophene hydrodesulfurization: Effect of acidity of the support over activities

Cited by 21 publications

References 24 publications

Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS2/Al2O3 and ReS2/SiO2 Catalysts

Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS2/Al2O3 and ReS2/SiO2 Catalysts

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Niobium‐Based Nickel–Tungsten Hydrotreatment Catalysts with Enhanced Isomerization Properties

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