From core–shell MoS<sub>x</sub>/ZnS to open fullerene-like MoS<sub>2</sub> nanoparticles

Blanco, Élodie; Uzio, Denis; Berhault, Gilles; Afanasiev, P.

doi:10.1039/c3ta14888b

Cited by 25 publications

(16 citation statements)

References 44 publications

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“…Another method for achieving high surface areas and improve the dispersion is the use of organic templates. This section deals with the hydrodesulfurization activity of the catalysts synthesized using various organic templates such as polyethylene glycol [157][158][159][160], polivinylpyrrolidone (PVP) [161], pluronic 123 (P123) [162], tetrabutylammonium bromide [163], or biotemplates [164]. The use of templates could improve morphology, thermal stability, and the formation of active NiMoS/CoMoS phases [157].…”

Section: Template Methodsmentioning

confidence: 99%

“…The use of templates could improve morphology, thermal stability, and the formation of active NiMoS/CoMoS phases [157]. Various morphologies as belt-like [158], fullerene-like [159], core-shell like [160] particles with more active sites were reported for unsupported HDS catalysts. The morphology and active phases depend on the content of the surfactant used in catalyst synthesis.…”

Section: Template Methodsmentioning

confidence: 99%

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Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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The literature from the past few years dealing with hydrodesulfurization catalysts to deeply remove the sulfur-containing compounds in fuels is reviewed in this communication. We focus on the typical transition metal sulfides (TMS) Ni/Co-promoted Mo, W-based bi- and tri-metallic catalysts for selective removal of sulfur from typical refractory compounds. This review is separated into three very specific topics of the catalysts to produce ultra-low sulfur diesel. The first issue is the supported catalysts; the second, the self-supported or unsupported catalysts and finally, a brief discussion about the theoretical studies. We also inspect some details about the effect of support, the use of organic and inorganic additives and aspects related to the preparation of unsupported catalysts. We discuss some hot topics and details of the unsupported catalyst preparation that could influence the sulfur removal capacity of specific systems. Parameters such as surface acidity, dispersion, morphological changes of the active phases, and the promotion effect are the common factors discussed in the vast majority of present-day research. We conclude from this review that hydrodesulfurization performance of TMS catalysts supported or unsupported may be improved by using new methodologies, both experimental and theoretical, to fulfill the societal needs of ultra-low sulfur fuels, which more stringent future regulations will require.

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Section: Template Methodsmentioning

confidence: 99%

Section: Template Methodsmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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“…The mean diameters of the particles are usually in the range of 50 to 80 nm for IF-MoS 2 and 80 to 120 nm for IF-WS 2 . However, following the first synthesis of this type of particles in 1992, new synthesis methods were employed, leading to IF nanoparticles of perfectly controlled size, shape and morphology [38][39][40][41].…”

Section: Metal Disulfide Fullerene-like Nanoparticlesmentioning

confidence: 99%

“…Since their discovery by Tenne et al in 1992 [31], new synthesis processes for inorganic fullerene-like nanoparticles made of metal dichalcogenides were developed over the years, giving a wide range of layered inorganic compounds [35,36,[38][39][40][41] with different intrinsic characteristics (morphology, shape, crystal structure etc.). Rosentsveig et al [34] modified the synthesis process developed in 1992 by Tenne et al to produce new perfectly spherical and crystallized IF-MoS 2 nanoparticles presenting a large number of shells and leaving almost no empty core in the center of the nanoparticles.…”

Section: Influence Of Particle Crystallinitymentioning

confidence: 99%

Nanoparticles as Additives for the Development of High Performance and Environmentally Friendly Engine Lubricants

Dassenoy

2019

Tribology Online

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There has been growing interest in nanoparticles for tribological applications over the past 20 years. Studies have shown their remarkable lubricating properties, namely friction-reduction and anti-wear, especially when used as lubricant additives. This makes them potential candidates for replacing the additives currently used in automobile lubricants, known to be pollutants and less efficient in certain specific conditions. Among the nanoparticles with proven tribological performance are carbon nanoparticles (nanotubes, onion, diamond, etc.), BN and TiO 2 nanoparticles, and Inorganic Fullerene-like (IF) metal disulfides (IF-MoS 2 , IF-WS 2). At the Laboratory of Tribology and Dynamic of Systems (LTDS) of the Ecole Centrale of Lyon (ECL), these nanoparticles have been the subject of detailed investigation for more than fifteen years. Many key issues have been tackled, such as the conditions leading to these properties, the lubrication mechanisms involved, and the influence of parameters such as the size, the structure, and the morphology of the nanoparticles on both their tribological properties and lubrication mechanisms. In order to answer such questions, state-of-theart characterization techniques are required, often in situ, and sometimes extremely complex to set up. Some of them can even visualize the behavior of a nanoparticle in real time while it is undergoing tribological testing. Researchers now have good understanding of the way these nanoparticles behave, and are able to identify the key parameters to be adjusted to optimize their lubrication properties. In this article, the performance of nanoparticles when used as additives will be described, with particular attention given to metal disulfide nanoparticles. Furthermore, the influence of key parameters on the performance of oils containing nanoparticles will be discussed and the lubrication mechanisms of the metal disulfide nanoparticles will be presented in detail. The issues remaining to be solved before developing new lubricants containing nanoparticles will be also discussed. Finally, we show how fully formulated lubricants containing nanoparticles behave when tested under conditions close to the final application (automotive engine and gearboxes).

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“…In order to fully transform the precipitated MoS 3 to MoS 2 . This was achieved by incorporating an additional heating unit between the reactor outlet and the cooling system, affording an additional residence time of~30 s at a set temperature of 250°C, as shown in Figure 3a.…”

Section: -mentioning

confidence: 99%

The sequential continuous-flow hydrothermal synthesis of molybdenum disulphide

et al. 2015

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Molybdenum disulphide (MoS2) has been widely used as a catalyst and high temperature lubricant. It has been heavily researched recently as a graphene analogue and member of the so-called inorganic fullerenes. Here we report the first continuous flow hydrothermal synthesis of MoS2. With fast reaction times and flexibility the continuous flow hydrothermal system allowed MoS2 to be produced in a stepwise fashion, offering an insight into the mechanism involved. It has been found that the synthesis of MoS2 proceeded via the sulphidation of molybdate anions to thiomolybdate species, which are transformed to amorphous MoS3 by acidification in flow, before further hydrothermal treatment decomposes this amorphous precursor to tangled MoS2 nanosheets.

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From core–shell MoS_x/ZnS to open fullerene-like MoS₂ nanoparticles

Abstract: Open 20–50 nm size fullerene-like MoS2 particles having controllable size and wall thickness were prepared with a quantitative yield from the seed-grown core–shell materials MoSx/ZnS (x ∼ 3–4).

Cited by 25 publications

References 44 publications

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Nanoparticles as Additives for the Development of High Performance and Environmentally Friendly Engine Lubricants

The sequential continuous-flow hydrothermal synthesis of molybdenum disulphide

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From core–shell MoSx/ZnS to open fullerene-like MoS2 nanoparticles

Abstract: Open 20–50 nm size fullerene-like MoS2 particles having controllable size and wall thickness were prepared with a quantitative yield from the seed-grown core–shell materials MoSx/ZnS (x ∼ 3–4).

Cited by 25 publications

References 44 publications

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Nanoparticles as Additives for the Development of High Performance and Environmentally Friendly Engine Lubricants

The sequential continuous-flow hydrothermal synthesis of molybdenum disulphide

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From core–shell MoS_x/ZnS to open fullerene-like MoS₂ nanoparticles