Hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene over sulfided NiMo/?-Al2O3, CoMo/?-Al2O3, and Mo/?-Al2O3 catalysts

Egorova, Marina

doi:10.1016/j.jcat.2004.05.002

Cited by 313 publications

(201 citation statements)

References 51 publications

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“…Mo content in the material was found to be 10%, an optimal content for a supported MoS 2 catalyst (van Veen and Colijn, 1993;Meille et al, 1997;Breysse et al, 2003;Egorova and Prins, 2004;Topsoe, 2007). Figure 3a presents the STEM-HAADF image at relatively low magnification of a typical MoS 2 -SiO 2 catalyst particle prepared by USP method, suggesting that MoS 2 (brighter area) is highly dispersed within the SiO 2 sphere template.…”

Section: Resultsmentioning

confidence: 98%

“…Molybdenum sulfides-based catalysts have been extensively used in hydrodesulfurisation (HDS) for several decades (van Veen and Colijn, 1993;Meille et al, 1997;Breysse et al, 2003;Egorova and Prins, 2004;Topsoe, 2007). Having the potential to enhance its catalyst activity, nanostructured MoS 2 -based catalysts have attracted significant interests in recent years.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

et al. 2011

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Hierarchical structure porous MoS 2 /SiO 2 microspheres were prepared by ultrasonic pyrolysis technique. The nanostructured MoS 2 /SiO 2 materials were characterised by scanning electron micrograph (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), as well as nitrogen isotherm. The MoS 2 /SiO 2 microspheres, synthesised using polystyrene latex spheres as a template, showed two pore sizes: 5.8 and 68 nm. The micro-, meso-and macropore volume was also calculated. Effect of PSL:SiO 2 ratio on the hierarchical structure was also investigated.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

et al. 2011

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“…Atomic parameters for Mo and t the calculations were obtained from Alvarez et al and provided in Table 1 [21]. It is necessary to stress that experimental lattice parameters instead of optimized values were used searching for a best match between our results with the available experimental information provided in the literature.…”

Section: Experimental and Calculationsmentioning

confidence: 99%

Experimental and Theoretical Properties of MoS<sub>2+x</sub> Nanoplatelets

Galván¹,

Amarillas²,

Elizondo³

et al. 2013

MRC

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The synthesis and the catalysis in the HDS of DBT reaction of nanostructured self-supported catalyst containing MoS 2+x nanoplatelets have been investigated. Enhancement of higher activity observed in sulfide catalyst sample (d) with respect to the ex situ and in situ references is more closely related to the morphology change of particles (nanoplatelets). In this work, we suggest that certain structures present in model catalysts maybe related to low dimensional structures and present a theoretical study of two MoS 2 clusters (one made of 34 atoms/cluster and the second one made of 41 atoms/cluster), to these clusters seven sulfur atoms were randomly located at the surface of the sulfur layer, in order to simulate certain structures resembling arrow shaped nanoplatelets that were found in a High Resolution TEM analysis performed in some MoS 2 samples. Additionally, one of the goals is to enquire about the electronic properties presented in such structures when the clusters terminated as Mo-or S-edge and if it could be correlated to the catalyst behavior of these compounds. To the 34 atoms/cluster Mo-edge yielded metallic behavior while the second cluster the 41 atoms/ cluster S-edge yielded a semiconductor behavior with a forbidden energy gap E g of the order of  3.6 eV between the Valence and Conductions bands respectively. Moreover, to the same clusters enunciated formerly, when the sulfur atoms were located at the surface of the S-layer, for the first cluster (34 atoms/cluster) yielded a more metallic behavior, while the second one (41 atoms/cluster) yielded an isolator behavior. Our results agree with the experimental and theoretical results presented by several groups in different laboratories arriving to the conclusion that the S-Mo-S Mo-edge arrow heads structures could be responsible to the enhancement of the catalytic activity on the MoS 2 studied samples.

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“…The synthesis of 2 from 1 was performed in a continuous plug-flow fix-bed reactor usually used in hydrodesulfurization experiments [24]. Two types of catalysts were used, a bimetallic 3 wt-% Pd/1 wt-% Pt/Al 2 O 3 catalyst and a 8 wt-% sulfided Mo/g-Al 2 O 3 catalyst, both prepared by incipient wetness impregnation [21] [25]. The reactor was loaded with 40 to 75 mg of catalyst mixed with SiC (8 g) to achieve plug-flow conditions.…”

Section: Experimental Partmentioning

confidence: 99%

Preparation of Partially Hydrogenated 4,6‐Dimethyldibenzothiophenes

Kukula¹,

Gramlich²,

Prins³

2006

Helvetica Chimica Acta

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Dedicated to Professor Giambattista Consiglio on the occasion of his 65th birthdayThe synthesis of three key intermediates of the hydrogenation pathway in the hydrodesulfurization of 4,6-dimethyldibenzothiophene (4,6-DM-DBT; 1) is described. The hydrogenated derivatives 1,2,3,4-tetrahydro-4,6-dimethyldibenzothiophene (= 4,6-dimethyl-1,2,3,4-tetrahydrodibenzothiophene; 4,6-DM-TH-DBT; 2), 1,2,3,4,4a,9b-hexahydro-4,6-dimethyldibenzothiophene (= 4,6-dimethyl-1,2,3,4,4a,9b-hexahydrodibenzothiophene; 4,6-DM-HH-DBT; 3), and dodecahydro-4,6-dimethyldibenzothiophene (= 4,6-dimethylperhydrodibenzothiophene; 4,6-DM-PH-DBT; 4) were prepared by direct hydrogenation of 1. The reactions were carried out in continuous and batch reactors by using metal sulfide as well as noblemetal catalysts. The influence of the reaction conditions on the formation of the products and the distribution of their stereoisomers was studied in detail. The isomers of the main products were isolated and characterized by NMR, GC/MS/MS, and X-ray crystal-structure diffractometry.

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Hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene over sulfided NiMo/?-Al2O3, CoMo/?-Al2O3, and Mo/?-Al2O3 catalysts

Cited by 313 publications

References 51 publications

Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

Experimental and Theoretical Properties of MoS<sub>2+x</sub> Nanoplatelets

Preparation of Partially Hydrogenated 4,6‐Dimethyldibenzothiophenes

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Hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene over sulfided NiMo/?-Al2O3, CoMo/?-Al2O3, and Mo/?-Al2O3 catalysts

Cited by 313 publications

References 51 publications

Synthesis of hierarchical structured porous MoS2/SiO2 microspheres by ultrasonic spray pyrolysis

Synthesis of hierarchical structured porous MoS2/SiO2 microspheres by ultrasonic spray pyrolysis

Experimental and Theoretical Properties of MoS&lt;sub&gt;2+x&lt;/sub&gt; Nanoplatelets

Preparation of Partially Hydrogenated 4,6‐Dimethyldibenzothiophenes

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Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

Synthesis of hierarchical structured porous MoS₂/SiO₂ microspheres by ultrasonic spray pyrolysis

Experimental and Theoretical Properties of MoS<sub>2+x</sub> Nanoplatelets