MoS2 structures in high-activity hydrotreating catalysts

Eijsbouts, S.; Heinerman, J. J. L.; Elzerman, H.J.W.

doi:10.1016/0926-860x(93)85133-a

Cited by 132 publications

(42 citation statements)

References 32 publications

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“…The chemical states and dispersion of active metal species in the supported Co(Ni)-Mo(W)/ -Al 2 O 3 catalysts have been widely studied using chemisorption of probe molecules (42), XRD (43), XPS (43,44), EXAFS (39), infrared (45), Mössbauer (16,17), transmission electron microscopy (46), and diffuse reflectance spectroscopy (31). We did not attempt to investigate the structural states of Ni and Mo in the calcined Ni-Mo/ -Al 2 O 3 -B 2 O 3 .…”

Section: Dispersion Of Active Metal Speciesmentioning

confidence: 99%

Spectroscopic Characterization of Ni-Mo/γ-Al2O3-B2O3 Catalysts for Hydrodesulfurization of Dibenzothiophene

Sato

Imamura

et al. 1997

Journal of Catalysis

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Section: Dispersion Of Active Metal Speciesmentioning

confidence: 99%

Spectroscopic Characterization of Ni-Mo/γ-Al2O3-B2O3 Catalysts for Hydrodesulfurization of Dibenzothiophene

Sato

Imamura

et al. 1997

Journal of Catalysis

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“…To assess the number of edge atoms, it is necessary to model the form of the sulphur phase. In this work, this phase was modelled by MoS 2 hexagonal sheets as suggested by some authors [13][14][15].…”

Section: Evaluation Of the Number Of Active Sitesmentioning

confidence: 99%

Quantitative Surface Analysis by Xps (X-Ray Photoelectron Spectroscopy): Application to Hydrotreating Catalysts

Beccat

Silva

Huiban

et al. 1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Analyse quantitative de surface par XPS (X-ray photoelectron spectroscopy) : application aux catalyseurs d'hydrotraitement -La spectroscopie XPS est une technique de choix pour fournir la composition chimique de l'extrême surface de matériaux solides, très appliquée à l'étude des catalyseurs. Dans cet article, nous montrons qu'une approche quantitative basée sur l'expression fondamentale du signal XPS a permis d'obtenir un jeu cohérent de facteurs de réponse pour tous les éléments du tableau périodique. Un travail de fond a été nécessaire pour connaître de façon précise la fonction de transmission du spectromètre utilisé à l'IFP. Abstract -Quantitative Surface Analysis by XPS (X-Ray Photoelectron Spectroscopy): Application to Hydrotreating Catalysts -XPS is an ideal technique to provide the chemical composition of the extreme

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“…24 To compare the distribution of the slabs lengths and stacking after the sulfidation treatment, and the methanation reactions with and without water, about 15 images and 200 slabs for each sample were statistically analyzed. The distributions of the slab lengths in the Mo/ Al and Co-Mo/Al catalysts are presented in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

Influence of Water on the Methanation Performance of Mo‐Based Sulfur‐Resistant Catalysts with and without Cobalt Additive

Wang

Lin

et al. 2015

Bulletin Korean Chem Soc

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The activities of Mo-based and Co-containing Mo-based catalysts for sulfur-resistant methanation in the presence and the absence of water are compared. When water was added to the Mo-based catalyst, its methanation activity decreased and the activity could not be recovered even after the water was removed from the system. However, for the Co-containing Mo-based catalysts, the formation of Co 9 S 8 improved not only the methanation activity of the catalyst as active sites but also the stability of the catalyst especially in water-containing hydrogenation. The deactivation of the Mo-based catalyst in the presence of water is mainly due to reduction of the external acid sites and fewer molybdenum sulfide (MoS 2 ) stacks. The addition of Co protects the active MoS 2 phase, thereby preventing the deactivation of the catalyst in the presence of water.Keywords: Sulfur-resistant, Methanation, Deactivation, Water Introduction Today, the global need for vast amounts of energy is a pressing concern. In addition, methods to utilize coal in an environmentally friendly manner are also greatly desired. With both goals in mind, methanation is considered an important means of producing substitute natural gas from biomass or coal. 1 Often the catalysts for the methanation of syngas contain nickel or cobalt as the active ingredient. These metallic catalysts are relatively cheap and very active for the reaction. However, they are extremely sensitive to poisoning by sulfur compounds. 2 Thus attention has turned to Mo-based methanation catalysts which are sulfur-resistant and can tolerate the gases of low H 2 /CO ratios that come from gasifiers. It is possible for a Mo-based catalyst to cover the shortage of their relatively low activity by using simplified production technology without enhancing the H 2 /CO mole ratio or removing sulfur species.Mo-based sulfides are used widely in hydrotreating processes to produce clean fuels and aromatic compounds.3 These catalysts are also used extensively in commercial catalytic hydrogenations 4,5 (e.g., hydrodesulfurization (HDS), hydrodenitrogenation, and hydrotreating). It has been well established that their active sites are located on the edges of the molybdenum sulfide (MoS 2 ) nanocrystallites, which correspond to the (100) edge planes of their layered structures. 6 Water can deactivate sulfided hydrotreating catalysts by changing their structure or chemical composition. The presence of water can modify the structure of the active edges of the sulfide phase and can influence the stability of the catalysts.7 During the hydrotreating of low-sulfur content feeds, sulfided catalysts usually undergo a continuous deactivation as a result of the partial reoxidation of the sulfide phase. 8 In addition, water may cause sulfate species to form; these then cover the active phase and reduce the catalytic activity. 9Cobalt molydates are important components of catalysts used for the partial oxidation of hydrocarbons 10 and for the synthesis of HDS catalysts.11 The desulfurization and denitrogenation pe...

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MoS2 structures in high-activity hydrotreating catalysts

Cited by 132 publications

References 32 publications

Spectroscopic Characterization of Ni-Mo/γ-Al2O3-B2O3 Catalysts for Hydrodesulfurization of Dibenzothiophene

Spectroscopic Characterization of Ni-Mo/γ-Al2O3-B2O3 Catalysts for Hydrodesulfurization of Dibenzothiophene

Quantitative Surface Analysis by Xps (X-Ray Photoelectron Spectroscopy): Application to Hydrotreating Catalysts

Influence of Water on the Methanation Performance of Mo‐Based Sulfur‐Resistant Catalysts with and without Cobalt Additive

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