ChemInform Abstract: HYDRODESULFURIZATION OF SULFUR HETEROCYCLIC COMPOUNDS. KINETICS OF DIBENZOTHIOPHENE

Singhal, Gopal H.; Espino, R.L.; Sobel, J.E.; Huff, George A.

doi:10.1002/chin.198121152

Cited by 13 publications

(22 citation statements)

References 1 publication

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“…In the conversion of DBT the major product obtained was BP, while in the HDS of 4,6-DMDBT HN was the major product. This trend was similar to that obtained over traditional catalysts [23,24].…”

Section: Co//mo and Co//w Synergismsupporting

confidence: 89%

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Deep Hydrodesulphurization via Hydrogen Spillover

et al. 2011

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The synergistic effect between Co//Mo and Co//W stacked bed systems in the hydrodesulphurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied. The reaction was carried out in a high-pressure continuous-flow microreactor at 3 MPa and 300°C. The observed synergism can only be explained by the action of hydrogen spillover (H SO ). The selectivity in hydrogenation over direct desulphurization pathways (HYD/DDS) of Mo/c-Al 2 O 3 and W/c-Al 2 O 3 catalysts increased when the reaction was carried out in Co//Mo and Co//W stacked bed systems, respectively. The changes in selectivity can be explained by the fact that hydrogen spillover does not only create more active sites, but it also modifies the sites, favouring the HYD pathway. Differences in synergistic effect between Co//Mo and Co//W stacked bed systems were related to the higher degree of sulphurization of the molybdenum compared to the tungsten phase, as detected by XPS.

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Section: Co//mo and Co//w Synergismsupporting

confidence: 89%

“…In this context, studies of the HDS of DBT by Singhal et al [24] and of the HDS of 4,6-DMDBT by Bataille et al [15] proposed a common intermediate for the DDS and HYD reaction pathways, as shown in Fig. 4a, b.…”

Section: Selectivity and Product Distributionmentioning

confidence: 98%

Deep Hydrodesulphurization via Hydrogen Spillover

et al. 2011

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“…This is quite normal in the case of the HYD reaction which involves successive hydrogenation steps, but this is more surprising for the DDS reaction, unless this reaction involves also a hydrogenating step. As proposed by others [23,24], a possible explanation is the existence of a common intermediate (dihydrodibenzothiophene) for the HYD and the DDS pathways. However, the promoter increases the rate of the DDS reaction much more than the rate of the HYD reaction, which indicates that it probably does not modify only the hydrogenating properties of the Mo/alumina catalyst.…”

Section: Discussionmentioning

confidence: 76%

Thioreduction of cyclopentanone and hydrodesulfurization of dibenzothiophene over sulfided nickel or cobalt-promoted molybdenum on alumina catalysts

Mijoin

Thévenin

Aguirre

et al. 1999

Applied Catalysis A: General

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“…They all agree that there are two possible reaction pathways as shown in Fig. 1 [8][9][10][11]. The first one is called the direct desulfurization (DDS) and produces biphenyl (BP) and its methylated derivative for DBT and DMDBT desulfurization, respectively.…”

Section: Introductionmentioning

confidence: 82%