89 “Nebula”: A hydroprocessing catalyst with breakthrough activity

Plantenga, F.L.; Cerfontain, R.; Eijsbouts, S.; Houtert, F. van; Anderson, G.H.; Miseo, S.; Soled, S.; Riley, Kenneth L.; Fujita, Kyoko; Inoue, Yoshimasa

doi:10.1016/s0167-2991(03)80246-x

Cited by 53 publications

(22 citation statements)

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“…The preferred selectivity for the HYD pathway of ex situ activated catalysts, even with very weak (002) signals or low staking is in agreement with that of other NiMoW systems [11,[25][26][27]. On the other hand, the selectivity of in situ activated catalysts leans toward the DDS pathway.…”

Section: Discussionsupporting

confidence: 83%

“…Cobalt-or nickelpromoted unsupported HDS catalysts have been prepared by different methods, including comaceration [4] and homogeneous sulfide precipitation [5]; catalyst precursors can be decomposed by ex situ or in situ methods [6][7][8][9]. Soled et al [10,11] have synthesized trimetallic (NiMoW) catalyst precursors using several methods, including direct precipitation and pH-controlled precipitation. Thus, when Mo is substituted at least partially for W in these precursors, an amorphous phase is produced, whose decomposition and sulfidation yields catalytically active materials.…”

Section: Introductionmentioning

confidence: 99%

“…With the development of a trimetallic catalyst three times more active [11] than conventional industrial catalysts, the research into novel and improved catalytic materials for hydrotreatment has renewed importance for the petroleum industry. Recently, Nava et al [12] have obtained unsupported trimetallic catalytic materials from in situ activation of alkyl thiomolybdotungstates.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of In situ/Ex situ Activated Trimetallic NiMoW Sulfide Catalysts Prepared from Ammonium Thiomolybdotungstates

et al. 2009

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Unsupported trimetallic NiMoW sulfide catalysts with high hydro-desulphurization activities are prepared from Ni-containing ammonium thiomolybdo tungstates by in situ and ex situ activation. These precursors are prepared by adding an aqueous NiCl 2 solution to an aqueous (NH 4 ) 4 MoWS 8 solution in either a 1:1 or 0.5:1 Ni/Mo(W) molar ratio. The resulting precursors Ni 0.5 / (NH 4 ) 4 MoWS 8 and Ni/(NH 4 ) 4 MoWS 8 yield Ni 0.5 MoW-in situ, NiMoW-in situ, Ni 0.5 MoW-ex situ and NiMoW-ex situ sulphide catalysts, respectively. The activation method affects both physical and chemical properties, such as macro and microstructure, crystalline structure, specific surface area, N 2 adsorption-desorption isotherms. The in situ/ex situ activation of these ammonium thiotrimetallate precursors leads to a mesoporous structure with a pore size ranging from 20 to 60 Å and type IV N 2 adsorptiondesorption isotherms. X-ray diffraction patterns of unsupported NiMoW sulfide catalysts correspond to those of a microcrystalline material, with outstanding reflections attributed to MoS 2 , WS 2 , NiS, and Ni 9 S 8 phases.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Study of In situ/Ex situ Activated Trimetallic NiMoW Sulfide Catalysts Prepared from Ammonium Thiomolybdotungstates

et al. 2009

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“…In recent years, an unsupported NiMoW tri-metallic HDS catalyst, called NEBULA, has been drawing much attention, [19][20][21] because its HDS activity is much higher than those of other conventional catalysts. Different methods have been applied for the synthesis of such NiMoW catalyst.…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

Wang

Zhang

et al. 2011

Applied Catalysis A: General

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“…The catalysts of choice for HDS of crude oils for many decades have been cobalt and nickel promoted molybdenum sulfides [3,4]. Recently new technologies for the production of ultra low sulfur diesel (ULSD) have been used in commercial hydrotreaters reaching <10 ppm sulfur content in the products [5][6][7]. The actual hydrotreatment (HDT) catalysts are generally based on Mo and W sulfides commonly supported on alumina, and promoted with Co and Ni.…”

Section: Introductionmentioning

confidence: 99%

High activity Ni/MoS2 catalysts obtained from alkylthiometalate mixtures for the hydrodesulfurization of dibenzothiophene

et al. 2007

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An efficient method for improving the catalytic properties of unsupported Ni/MoS 2 catalysts is mixing thiometalate precursors applying the appropriate precursors and thermal conditions. High active catalysts for the hydrodesulfurization (HDS) of dibenzothiophene (DBT) are prepared by the controlled decomposition of physical mixtures of Ni(diethylentriamine) 2 MoS 4 (NDTA-TM) and [(Propyl) 4 N)] 2 MoS 4 (TPA-TM). The catalysts with a higher content of NDTA-TM are very active with a high selectivity for the direct desulfurization pathway (DDS) due to the synergistic effect of nickel. In addition the presence of a large amount of carbon may produce single-slabs of nickel promoted carbon containing molybdenum sulfides. The activity enhancement is attributed to an increased number of NiMoS active sites originated by the chemical interaction between the precursors NDTA-TM and TPA-TM during the mixing procedure. Furthermore, the carbon content in the final products is related to the enhancement of the activity and the preference of the DDS pathway. The controlled decomposition of mixtures of NDTA-TM + TPA-TM yields catalysts which are about twofold more active than an industrial NiMo/Al 2 O 3 catalyst. This improvement may be attributed to an intense interaction of the precursors during the synthesis causing a re-dispersion of nickel atoms from NDTA-TM over the surface of carbon containing molybdenum sulfide provided by the precursor TPA-TM, increasing the amount of active sites. The catalysts from mixtures of (NH 4 ) 2 MoS 4 (A-TM) and NDTA-TM behave similarly to the pure precursors.

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89 “Nebula”: A hydroprocessing catalyst with breakthrough activity

Cited by 53 publications

References 1 publication

Comparative Study of In situ/Ex situ Activated Trimetallic NiMoW Sulfide Catalysts Prepared from Ammonium Thiomolybdotungstates

Comparative Study of In situ/Ex situ Activated Trimetallic NiMoW Sulfide Catalysts Prepared from Ammonium Thiomolybdotungstates

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

High activity Ni/MoS2 catalysts obtained from alkylthiometalate mixtures for the hydrodesulfurization of dibenzothiophene

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