Study on Unsupported Nano-MoS&lt;sub&gt;2&lt;/sub&gt; Catalyst for Clean Fuel

Zhu, Yu Qin; Zhou, Dan

doi:10.4028/www.scientific.net/amr.287-290.1860

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Production of mono-and few-layered nanosheets in large quantities is required, not only to provide material for studying unusual properties caused by quantum effects, but also due to an enormous interest in the production of new materials with extraordinary properties. MoS 2 can be one of these candidates: its unique properties predetermine its use in various elds including catalysts, 5 hydrogen storage, 6 or lubricants. 7 A recent theoretical study, 8 which seems to be consistent with experimental data, 9 suggests that the tuning layer can control the transformation from an indirect to a direct band gap.…”

Section: Introductionmentioning

confidence: 99%

Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation

2013

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Intense ultrasound in a pressurized batch reactor was used for preparation of monolayered MoS2 nanosheets from natural mineral molybdenite. Exfoliation of bulk MoS2 using ultrasound is an attractive route to large-scale preparation of monolayered crystals. To evaluate the quality of delamination, methods like X-ray diffraction, Raman spectroscopy and microscopic techniques (TEM and AFM) were employed. From single- or few-layered products obtained from intense sonication, MoS2 quantum dots (MoSQDs) were prepared by a one-pot reaction by refluxing exfoliated nanosheets of MoS2 in ethylene glycol under atmospheric pressure. The synthesised MoSQDs were characterised by photoluminescence spectroscopy and laser-scattering particle size analysis. Our easy preparation leads to very strongly green luminescing quantum dots.

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Section: Introductionmentioning

confidence: 99%

Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation

2013

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“…The near molecular size of transition metal sulfides can realize the highest level of catalyst utilization. Many molybdenum compounds, such as ammonium molybdate, molybdenum dialkyl dithiocarbamate, molybdenum naphthenate, etc., were used as dispersed catalysts in slurry-phase hydrocracking because of the high hydrogenation activity of MoS 2 . − …”

Section: Introductionmentioning

confidence: 99%

Effects of the Temperature and Initial Hydrogen Pressure on the Isomerization Reaction in Heavy Oil Slurry-Phase Hydrocracking

Liu

et al. 2015

Energy Fuels

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Thermal hydrocracking and slurry-phase hydrocracking of Karamay vacuum residue (KLVR) were studied, and the hydrocracked products were analyzed by gas chromatography (GC) and a paraffins, olefins, naphthalenes, and aromatics (PONA) composition analysis system. The effects of the temperature and initial hydrogen pressure on the isomerization reaction in heavy oil slurry-phase hydrocracking were investigated. Experimental data revealed that the conversion of KLVR increased as the temperature and initial hydrogen pressure increased in both thermal hydrocracking and slurry-phase hydrocracking. Hydrogen consumption of slurry-phase hydrocracking increased with the increase of the temperature and initial hydrogen pressure, while hydrogen consumption in thermal hydrocracking was negligible. Two impact indexes R G ′ and R N ′ were proposed to study the isomerization reaction in heavy oil slurry-phase hydrocracking. The results indicated that a high temperature and high initial hydrogen pressure enhanced the isoparaffin restraining effect of a dispersed Mo catalyst. Under a certain reaction temperature, the linear relation between impact indexes and hydrogen consumption was observed, indicating that the isomerization reaction was inhibited by hydrogen participating in a free-radical reaction.

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“…The homogeneously dispersed catalyst and feedstock oil were added into the reactor simultaneously, the catalyst was actually a precursor which could be converted to the active metal sulfides through a sulfuration reaction. Many molybdenum compounds were used as homogeneously dispersed catalysts in slurry-phase hydrocracking due to the high hydrogenation activity of MoS 2 [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Ren

et al. 2015

Appl Petrochem Res

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Thermal hydrocracking and catalytic hydrocracking of heavy oil and model reactant have been carried out to investigate the effect of dispersed Mo catalyst on slurry-phase hydrocracking. The XRD and XPS patterns suggested that the major existence form of dispersed Mo catalyst in slurry-phase hydrocracking was MoS 2 . Experimental data revealed that the conversion of feedstock oils and model reactant increased with the presence of catalyst, while the yields of light products (gas, naphtha) and heavy products (vacuum residue, coke) decreased, the yields of diesel and vacuum gas oil increased in the meantime. Besides, the yields of aromatic hydrocarbon and naphthenic hydrocarbon in naphtha fraction decreased. Effect parameters R G (the ratio of i-C 4 H 10 yield to n-C 4 H 10 yield) and isoparaffin/n-paraffin ratio were proposed to study the reaction mechanism of slurry-phase hydrocracking, the smaller effect parameters showed that there was no carbonium ion mechanism in slurry-phase hydrocracking, which still followed the free radical mechanism, and that the isomerization ratio of products decreased with the presence of Mo catalyst.

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Study on Unsupported Nano-MoS<sub>2</sub> Catalyst for Clean Fuel

Cited by 7 publications

References 8 publications

Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation

Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation

Effects of the Temperature and Initial Hydrogen Pressure on the Isomerization Reaction in Heavy Oil Slurry-Phase Hydrocracking

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

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