Effects of H2S on hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene on alumina-supported NiMo and NiW catalysts

Kabe, Toshiaki; Aoyama, Yasuo; Wang, Danhong; Ishihara, Atsushi; Qian, Weihua; Hosoya, Masataka; Zhang, Qin

doi:10.1016/s0926-860x(00)00770-5

Cited by 100 publications

(81 citation statements)

References 25 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: 92%

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: 92%

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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“…Wyniki badań wykazały, że ciepła adsorpcji DBT oraz 4,6-DMDBT na powierzchni katalizatora NiMo/Al 2 O 3 są porównywalne i wynoszą odpowiednio: 11 kcal/mol i 15 kcal/mol [13]. Inne wyniki badań [36] dowiodły, że stałe równowagi adsorpcji DBT, 2,8-DMDBT i 4,6-DMDBT są praktycznie takie same, pomimo różni-cy reaktywności tych związków.…”

Section: Reaktywność Związków Siarki -Przeszkody Steryczneunclassified

Chemia i katalizatory procesu głębokiego hydroodsiarczania

Lewandowski

2017

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Chemia i katalizatory procesu głębokiego hydroodsiarczania W artykule przedstawiono zagadnienia związane ze zrozumieniem mechanizmu katalitycznego procesu głębokiego hydroodsiarczania (HDS). Omówiono rodzaje związków siarki występujących w surowcach naftowych oraz ich reaktywność w aspekcie drugiego stopnia hydrorafinacji. Opisano typy katalizatorów procesu HDS oraz przedstawiono zagadnienia związane z wykorzystaniem nowych katalizatorów (niesiarczkowych) mających potencjalne zastosowanie w drugim (głębokim) stopniu hydrorafinacji.Słowa kluczowe: hydroodsiarczanie (HDS), hydrorafinacja, reaktywność związków siarki, karbazol, dibenzotiofen (DBT), 4,6-dimetylodibenzotiofen (4,6-DMDBT). Chemistry and catalysts of deep hydrodesulfurization processThe paper presents issues related to the understanding of the catalytic mechanism of the deep hydrodesulphurization process (HDS). The types of sulfur compounds present in petroleum products and their reactivity in terms of the second degree of hydrotreatment are discussed. The types of catalysts for the HDS process were described and the issues related to the use of new (non-sulfide) catalysts which have potential application in the second (deep) hydrotreatment are presented.

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“…For this purpose, the refractory sulfur compounds, particularly 4,6-dimethyldibenzothiophene (4,6-DMDBT), must be desulfurized or removed. General approaches to deep hydrodesulfurization include 1) improving the catalytic activity of the molybdenum sulfide-based catalysts used in the refining industry [26,27]; 2) developing new catalysts [28][29][30]; 3) tailoring reaction and process conditions [31], and 4) designing new reactor configurations [31]. In general, deep hydrodesulfurization of dibenzothiophenes over heterogeneous catalysts proceeds through two reaction pathways.…”

Section: Subtask 31: Desulfurization and Denitrogenationmentioning

confidence: 99%

Refinery Integration of by-Products From Coal-Derived Jet Fuels

Rudnick¹,

Boehman²,

Chen³

et al. 2004

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This report summarizes the accomplishments toward project goals during the first six months of the project to assess the properties and performance of coal based products.These products are in the gasoline, diesel and fuel oil range and result from coal based jet fuel production from an Air Force funded program. Specific areas of progress include generation of coal based material that has been fractionated into the desired refinery cuts, acquisition and installation of a research gasoline engine, and modification of diesel engines for use in evaluating diesel produced in the project. The desulfurization of sulfur containing components of coal and petroleum is being studied so that effective conversion of blended coal and petroleum streams can be efficiently converted to useful refinery products. Equipment is now in place to begin fuel oil evaluations to assess the quality of coal based fuel oil. Coal samples have procured and are being assessed for cleaning prior to use in coking studies.

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Effects of H2S on hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene on alumina-supported NiMo and NiW catalysts

Cited by 100 publications

References 25 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

Chemia i katalizatory procesu głębokiego hydroodsiarczania

Refinery Integration of by-Products From Coal-Derived Jet Fuels

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