ChemInform Abstract: HYDRODESULFURIZATION OF SULFUR HETEROCYCLIC COMPOUNDS. REACTION MECHANISMS

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

doi:10.1002/chin.198121151

Cited by 4 publications

(4 citation statements)

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“…Their data indicate that the conversion of dibenzothiophene occurs preferentially via the path with the least hydrogen consumption (DDS pathway) and that hydrogenation of biphenyl and cyclohexylbenzene is comparatively slow. A similar network, desulfurization to biphenyl and hydrogenation to tetrahydroand hexahydrodibenzothiophene followed by desulfurization to cyclohexylbenzene, was proposed by other groups [29][30][31]. Our data suggest that the overall network of the HDS of DBT is as represented in Scheme 1.…”

Section: Scheme 1 Reaction Network Of the Hds Of Dibenzothiophene Insupporting

confidence: 65%

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

Egorova

2004

Journal of Catalysis

313

151

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Section: Scheme 1 Reaction Network Of the Hds Of Dibenzothiophene Insupporting

confidence: 65%

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

Egorova

2004

Journal of Catalysis

313

151

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“…These differences of the effect of alkyl-substituted on HDN may be due to steric and/or electronic effects. Many publications hao shown that the steric and electronic effects play an important role on the HDS of a number of sulfur heterocycles (17,18,22,23).…”

Section: Sulfurcompoundsmentioning

confidence: 99%

Rate enhancement for catalytic upgrading coal naphthas

Jeng¹,

Keogh²,

Davis³

1992

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The amount of individual nitrogen and sulfur presented in the feed and hydrotreated Illinois #6 naphtha were determined. Th9 major nitrogen class in the naphtha are anilines. The major sulfur components identified are thiophenes and benzothiophenes. The aniline and quinoline is harder to remove than pyridine. The aniline and pyridine, without any carbon substituted, is the easiest one to remove in their class. The quinoline, without any carbon substituted, is approximately as hard as one carbon substituted quinoline to remove. Both Co-Mo and Ni-W catalysts follow the similar pattern of the nitrogen removal at different temperatures. The sulfur compounds of the III. #6 naphtha was separated to three classes, i.e. sulfides and thiols, thiophenes and benzothiophenes, for comparisons. The thiophenes was the major component of the hydrotreated naphtha at most temperatures; however, the sulfides and thiols class becomes the major compon_.nt at temperatures greater than 300°C.

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“…Direct hydrogenation of c-s bonds to yield H 2 s and a surface bound hydrocarbon intermediate is one such possibility. Such a mechanism has been proposed leading from dibenzothiophene to mercaptobiphenyl which 1s then hydrogenated to biphenyl and H 2 s. 10 In the case of thiophene HDS, a mechanism has been proposed similar to that of an alcohol dehydration reaction, in which the desulfurization occurs by an intramolecular hydrogenation of the sulfur atom leaving diacetylene as the .…”

Section: Introductionmentioning

confidence: 99%