Effect of acridine and of octahydroacridine on the HDS of 4,6-dimethyldibenzothiophene catalyzed by sulfided NiMoP/Al2O3

Rabarihoela-Rakotovao, V.; Brunet, Sylvette; Berhault, Gilles; Pérot, G.; Diehl, Fabrice

doi:10.1016/j.apcata.2004.02.017

Cited by 29 publications

(23 citation statements)

References 27 publications

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“…2). These results which are in accordance with previous studies [4,[19][20][21][22][23][24][25][26][27][28][29][30] fit with the generally accepted reaction scheme of the transformation of 46DMDBT (Scheme 1).…”

Section: Transformation Of 46dmdbtsupporting

confidence: 94%

“…9). In a previous work, we showed that acridine was also totally transformed in the presence of the sulphur compound and that the real inhibitor was probably OHA1 [27,28]. The decrease of the global HDS activity corresponded to a decrease of both the HYD and , the activity through the DDS pathway was partly recovered and slightly increased when the amount of acridine increased (Fig.…”

Section: Competitive Experiments-effect Of Acridine and 14dmcarb On Tmentioning

confidence: 70%

“…As reported previously [28], the transformation of acridine was separately studied in order to identify its products of decomposition under our experimental conditions. The transformation of acridine into hydrogenation products (HYD) was very fast and complete initially, then it was transformed into hydrodenitrogenation products (HDN) when the contact time increased (Fig.…”

Section: Transformation Of Acridinementioning

confidence: 99%

“…By analogy with quinoline [30] and acridine [27,28], we considered that the hydrogenation steps were reversible under the conditions of 14DMCARB transformation. The simultaneous reaction of both nitrogen compounds indicated that the acridine transformation was not modified by the presence of 14DMCARB.…”

Section: Transformation Of 14dmcarbmentioning

confidence: 99%

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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: Transformation Of 46dmdbtsupporting

confidence: 94%

Section: Competitive Experiments-effect Of Acridine and 14dmcarb On Tmentioning

confidence: 70%

Section: Transformation Of Acridinementioning

confidence: 99%

Section: Transformation Of 14dmcarbmentioning

confidence: 99%

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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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“…For six-membered multi-ring mono-aza nitrogen compounds (e.g., quinolines, acridines), the evidence has been that the ring-hydrogenated, but not denitrogenated intermediates (e.g., tetrahydroquinolines, octahydroacridines) are largely responsible for the inhibiting effects in the HDS of DBT [8,9]. Assuming that a parallel exists here, We surmise that PN's hydrogenated derivatives (e.g., octahydro-PN), being bidentate chelating ligands as well, may well be more inhibiting than PN itself.…”

Section: Discussion and Conjecturesmentioning

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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Effect of urea/metal ratio on the performance of NiMoP/Al2O3 catalyst for diesel deep HDS

Al‐Megren

Yu²,

Chen³

et al. 2015

Appl Petrochem Res

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Alumina-supported NiMoPOx catalysts have been prepared using urea matrix combustion-decomposition method. The effect of urea/metal ratios on the metal oxide dispersion, the conversion of the metal precursor to oxide and the structure and catalyst performance for diesel HDS has been studied. It is shown that the addition of urea adjusts the metal-support interaction, leading to the easy reduction of the metal oxide over the catalyst surface. It also changes the surface cluster of the oxide and the oxide structure. The addition of urea to metal matrix significantly improves the catalytic diesel HDS performance and increases the catalyst stability. The urea to Ni metal ratio of 2 gives the highest sulfur removal rate in the real diesel HDS process.

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Effect of acridine and of octahydroacridine on the HDS of 4,6-dimethyldibenzothiophene catalyzed by sulfided NiMoP/Al2O3

Cited by 29 publications

References 27 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

Inhibition of dibenzothiophene hydrodesulfurization by di-aza heterocycles

Effect of urea/metal ratio on the performance of NiMoP/Al2O3 catalyst for diesel deep HDS

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