Solution syntheses of unsupported Co(Ni)–Mo–S hydrotreating catalysts

Genuit, Daisy; Afanasiev, P.; Vrinat, M.

doi:10.1016/j.jcat.2005.08.016

Cited by 126 publications

(95 citation statements)

References 52 publications

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“…In this work, alcohol and surfactant were used to improve the dispersion of the active species and to control the morphology of the catalyst [12,11]. Furthermore, in the preparation of NiAlMoW precursors, molybdate and metatungstate anions could be exchanged with NO 3 − anion bonded to positive sheets in the interlayer galleries of the NiAl-LDH.…”

Section: Resultsmentioning

confidence: 99%

“…Though traditional HDS catalysts are highly efficient in removing thiols, sulfides, and disulfides, they are inefficient in ultra-deep desulfurization of refractory sulfur-containing compounds, such as 4,6-dimethydibenzothiophene (4,6-DMDBT). Therefore, development of novel HDS catalysts with super high activity is needed [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…Catalysts based on molybdenum or tungsten sulfides have been widely used for hydrodesulfurization and hydrogen evolution reaction by electrocatalysis, and introduction of Co or Ni promoters into these matrices results in significant enhancement in the catalytic activities. [14][15][16] Kanatzidis et al 17 4 were dissolved in formamide separately, and then Co or Ni precursor solution was added into the tetrathiomolybdate solution. In these reactions, cationic species of VIII group metals interacted with thiomolybdate anions, leading to precipitation of solids.…”

mentioning

confidence: 99%

Low-cost and high-performance CoMoS4 and NiMoS4 counter electrodes for dye-sensitized solar cells

et al. 2013

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Porous chalcogels CoMoS 4 and NiMoS 4 made by a facile solution reaction displayed good electrocatalytic activity in the redox reaction of the I À /I 3 À shuttle. Dye-sensitized solar cells with these ternary compounds as counter electrodes (CEs) showed photovoltaic performance similar to the devices made with noble metal platinum CE (7.46%).Dye-sensitized solar cells (DSSCs) have attracted significant attention as low-cost alternatives to traditional photovoltaic devices. 1,2 In DSSCs, counter electrodes (CEs) with both excellent electrocatalytic activity and high electrical conductivity are indispensable to obtain a low overvoltage and to accelerate the regeneration of I À from I 3 À . Due to the fact that noble metal Pt, the most widely used material for CEs at present, is very expensive, studies have recently been made extensively on low-cost Pt-like alternatives, including carbonbased materials, 3 conducting polymers, 4 and metals in the form of oxides, 5 sulfides, 6-10 selenides, 11 nitrides, 12 and carbides, 13 and great promise has been demonstrated in this field. Extension of the CE materials to ternary compounds may greatly expand this research platform. Catalysts based on molybdenum or tungsten sulfides have been widely used for hydrodesulfurization and hydrogen evolution reaction by electrocatalysis, and introduction of Co or Ni promoters into these matrices results in significant enhancement in the catalytic activities. 14-16 Kanatzidis et al. 17 have most recently reported the synthesis of porous CoMoS 4 and NiMoS 4 via facile solution reactions. In this work, we have applied these ternary materials with and without graphite additives as the counter electrodes in DSSCs. The resulting photovoltaic devices showed power conversion efficiency up to 7.31%, comparable to the DSSCs made with an expensive platinum-based counter electrode (7.46%).Ammonium tetrathiomolybdate (NH 4 ) 2 MoS 4 was obtained by the reaction of (NH 4 ) 6 Mo 7 O 24 Á4H 2 O and (NH 4 ) 2 S aqueous solution at ambient temperature. CoMoS 4 and NiMoS 4 were synthesized as previously described. 17 Briefly, Co(NO 3 ) 2 Á6H 2 O, Ni(NO 3 ) 2 Á6H 2 O and (NH 4 ) 2 MoS 4 were dissolved in formamide separately, and then Co or Ni precursor solution was added into the tetrathiomolybdate solution. In these reactions, cationic species of VIII group metals interacted with thiomolybdate anions, leading to precipitation of solids. As the polymerization proceeded, the viscosity of the solution increased, which eventually solidified to a monolithic black gel. It took 7-14 days for the viscous solution to transform into a rigid gel. The products were then annealed at 300 1C in a nitrogen atmosphere and characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), scanning and high-resolution transmission electron microscopy (HRTEM).Both Ni-and Co-based chalcogels were found to be amorphous, as indicated by the predominant broad features in the XRD patterns (Fig. S1, ESI †). A similar resu...

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“…HDS is the central process to remove sulphur from crude oils. There are several ways to prepare these catalysts, like comaceration [29], homogeneous sulphide precipitation [14], hydrothermal and solvothermal processes [30][31][32][33][34], solution reactions [35,36] and thiosalt decomposition [37][38][39]. With the decomposition of thiotungstates a high sulphur content can be achieved in the final WS 2 catalysts [40,41].…”

Section: Ws 2 Catalysts Are Promoted Mostly With Cobalt or Nickel Andmentioning

confidence: 99%

Thermal decomposition of ammonium tetrathiotungstate

Hunyadi

Ramos

Szilágyi

2015

J Therm Anal Calorim

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The thermal decomposition of ammonium tetrathiotungstate (ATT), (NH 4 ) 2 WS 4 was studied by SEM, FTIR, XRD, EDX and TG/DTA-MS. The decomposition of ATT involved three steps in inert atmosphere: (i) release of free water between 30-140 °C; (ii) formation of an amorphous WS 3 phase between 170-280 °C, from which (iii) a slightly crystalline WS 2 formed between 330-470 °C. As a difference compared to inert atmosphere, in air in the second step the ATT decomposed into directly WS 2 instead of WS 3 . This WS 2 phase was amorphous, and still contained traces of ATT. Between 260-2 500 °C from the WS 2 monoclinic tungsten oxide crystallized in two steps: at 302 °C a slightly crystalline m-WO 3 formed, which became more crystalline at 471 °C. During the investigation of the effect of the particle size, it was found that the thermal behaviour of ATT crystals was similar to ATT powder, with some shift in the decomposition temperature. The XRD results showed that the WS 2 formed from the ATT powder in N 2 had a higher level of crystallization, compared to the WS 2 obtained from ATT crystals.

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Solution syntheses of unsupported Co(Ni)–Mo–S hydrotreating catalysts

Cited by 126 publications

References 52 publications

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

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

Low-cost and high-performance CoMoS4 and NiMoS4 counter electrodes for dye-sensitized solar cells

Thermal decomposition of ammonium tetrathiotungstate

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