Inhibiting effects in hydrodesulfurization of 4,6-diethyldibenzothiophene

Ho, Teh C.

doi:10.1016/s0021-9517(03)00215-x

Cited by 77 publications

(72 citation statements)

References 13 publications

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“…Several authors [8,[36][37][38] indicate that the non-basic nitrogen compounds could be transformed into hydrogenated basic compounds which, then, would inhibit the reaction of HDS more strongly than the initial nitrogen compounds. Under our operating conditions, acridine is fast transformed into OHA1 (pKa = 7.37 ± 0.20) which would be more basic than acridine (pKa = 5.50 ± 0.20).…”

Section: Discussionmentioning

confidence: 99%

Deep HDS of Diesel Fuel: Inhibiting Effect of Nitrogen Compounds on the Transformation of the Refractory 4,6-Dimethyldibenzothiophene Over a NiMoP/Al2O3 Catalyst

Rabarihoela-Rakotovao

Diehl

Brunet

2008

Catal Lett

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The effect of nitrogen-containing compounds (acridine and 1,4-dimethylcarbazole: 14DMCARB) on the hydrodesulfurization of 4,6-dimethyldibenzothiophene (46DMDBT) was studied on a sulfided NiMoP/Al 2 O 3 catalyst in a fixed bed microreactor (340°C, 40 bar). Both nitrogen-containing compounds inhibited the hydrodesulfurization of 46DMDBT. However, the effect of acridine (a basic compound) and mainly its hydrogenated product (presumably 1,2,3,4,5,6,7,8-octahydroacridine: OHA1) was much more significant than the effect of 14DMCARB (a non-basic compound). In the presence of acridine, the socalled direct desulfurization pathway (DDS) of the HDS of 46DMDBT was less affected than the hydrogenation pathway (HYD) and was even slightly promoted when the partial pressure of acridine increased (after a strong initial inhibition). This was ascribed to a cocatalytic contribution of the nitrogen-containing compound to the C-S bond cleavage. 14DMCARB had the same inhibiting effect on both pathways (DDS and HYD). We also demonstrated that acridine inhibited the transformation of 14DMCARB and can explain why carbazoles are generally the main nitrogen impurities present in gasole after hydrotreatment.

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Section: Discussionmentioning

confidence: 99%

Deep HDS of Diesel Fuel: Inhibiting Effect of Nitrogen Compounds on the Transformation of the Refractory 4,6-Dimethyldibenzothiophene Over a NiMoP/Al2O3 Catalyst

Rabarihoela-Rakotovao

Diehl

Brunet

2008

Catal Lett

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“…Many attempts have been made to develop adsorbents for desulfurization and denitrogenation of commercial fuels using metal-based materials, zeolite-based materials, carbon materials, and activated alumina. [5,[8][9][10] CuY zeolite is reportedly capable of adsorbing sulfur and nitrogen compounds from commercial fuels selectively, with high adsorptive capacities at ambient temperature and pressure. [1,3] It was also reported that MAXSROB-II (2972 cm 2 g À1 ), a commercial activated carbon, can adsorb 98 mg S and 39 mg N per gram of adsorbent (A) from straight run oil gas (SRGO) containing 11 780 ppmw S and 260 ppmw N. [8] To date, a few studies have been performed on silica-based adsorbents.…”

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confidence: 99%

Adsorptive Desulfurization and Denitrogenation of Refinery Fuels Using Mesoporous Silica Adsorbents

et al. 2008

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Adsorbed in what it's doing: Well‐designed mesoporous silica adsorbents (see scheme) can contribute to the production of clean fuels through preferential adsorption of nitrogen‐ and sulfur‐containing compounds from light gas oil and heavy catalytic naphtha in refinery streams. The adsorbent with Zr ions shows a higher adsorption capacity and affinity for sulfur compounds than its non‐zirconia‐containing counterpart.

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“…The hydrogenation path produces CHB through prehydrogenation of one of the aromatic rings. The relative importance of these two paths may be roughly gauged by a hydrogenation index c defined as the concentration 1 Retired * To whom correspondence should be addressed. E-mail: teh.c.ho@exxonmobil.com ratio of CHB to BP in the liquid effluent, that is, c = (mole % CHB)/(mole % BP).…”

Section: Methodsmentioning

confidence: 99%

“…A fair amount of research has been done on the inhibiting effects of six-and five-membered nitrogen heterocycles containing only one nitrogen atom per molecule, or mono-aza heterocycles [1] and references therein]. To the best of our knowledge, no work has been reported on the inhibiting effects of heterocycles containing two nitrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of dibenzothiophene hydrodesulfurization by di-aza heterocycles

Sobel

2005

Catal Lett

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The hydrodesulfurization of dibenzothiophene over a sulfided CoMo/Al 2 O 3 catalyst can be severely inhibited by 1,10-phenanthroline. The catalyst's hydrogenation activity is totally suppressed and cannot be fully recovered upon stripping of adsorbed nitrogen species. The bulk of the hydrogenolysis activity is suppressed but can be completely recovered upon stripping. Implications of these observations are discussed, including the possibility of a chelating-enhanced adsorption mechanism.

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Inhibiting effects in hydrodesulfurization of 4,6-diethyldibenzothiophene

Cited by 77 publications

References 13 publications

Deep HDS of Diesel Fuel: Inhibiting Effect of Nitrogen Compounds on the Transformation of the Refractory 4,6-Dimethyldibenzothiophene Over a NiMoP/Al2O3 Catalyst

Deep HDS of Diesel Fuel: Inhibiting Effect of Nitrogen Compounds on the Transformation of the Refractory 4,6-Dimethyldibenzothiophene Over a NiMoP/Al2O3 Catalyst

Adsorptive Desulfurization and Denitrogenation of Refinery Fuels Using Mesoporous Silica Adsorbents

Inhibition of dibenzothiophene hydrodesulfurization by di-aza heterocycles

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