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Molybdenum disulfide

Molybdenum disulfide
1、Molybdenum Disulfide basic information:
English name: Molybdenum Disulfide
CAS No.: 1317-33-5
Molecular formula: MoS2 
Molar mass:160.06
Appearance: black/lead-gray solid
Density(water=1): 4.8
Melting point(℃): 1185 
Solubility: decomposed by aqua regie, hot sulfuric acid, nitric acid, insoluble in dilute acid and water
Hazardous characteristics: the powder in high temperature will burn and react violently with peroxide.
2、Molybdenum Disulfide introduction:
Molybdenum disulfide is the inorganic compound with the formula MoS2. This black crystalline sulfide of molybdenum occurs as the mineral molybdenite. It is the principal ore from which molybdenum metal is extracted. The natural amorphous form is known as the rarer mineral jordisite. MoS2 is less reactive than other transition metal chalcogenides, being unaffected by dilute acids. In its appearance and feel, molybdenum disulfide is similar to graphite. Indeed, like graphite, it is widely used as a solid lubricant because of its low friction properties, sometimes to relatively high temperatures. Molybdenum Disulfide (MoS2) is good solid lubricant available in three grades—Technical, Technical Fine, and Super Fine.
3、Molybdenum Disulfide production:
Molybdenite ore is processed by flotation to give relatively pure MoS2, the main contaminant being carbon. MoS2 also arises by the thermal treatment of virtually all molybdenum compounds with hydrogen sulfide. Molybdenite is the principal ore from which molybdenum metal is extracted.
Picture of Molybdenum Disulfide:

4、Molybdenum Disulfide Chemical properties
Molybdenum disulfide is stable in air or oxygen at normal conditions, but reacts with oxygen upon heating forming molybdenum trioxide:
2 MoS2 + 9 O2 → 2 MoO3 + 4 SO3 
Chlorine attacks molybdenum disulfide at elevated temperatures to form molybdenum pentachloride:
2 MoS2 + 7 Cl2 → 2 MoCl5 + 2 S2Cl2 
Molybdenum disulfide reacts with alkyl lithium under controlled conditions to form intercalation compounds LixMoS2. With butyl lithium, the product is LiMoS2.

5、Molybdenum Disulfide Applications:
MoS2 is used as additives in lubricating grease, friction materials, plastic, rubber, nylon, PTFE, coating and so on.
1) Widely used in automotive and mechanical industries,could be a very good solid lubricant materials.
2) Lubricant for the drills bits,cutting tools and some non-oil and hard alloy steel; Lubricant additive and film remover of the nonferrous metals.
3) Preparation of greases and additive of solid lubricant films, nylon filters and catalyst.
4) Synthetic MoS2 is employed as a catalyst for desulfurization in petroleum refineries

6、Molybdenum Disulfide Specifications:
 Typical Analysis  Technical  Technical Fine  Super Fine
 Acid Insoluble  0.50%  0.50%  0.50%
 Fe  0.25%  0.25%  0.25%
 MoO3  0.15%  0.15%  0.20%
 H2O  0.10%  0.10%  0.15%
 Oil  0.20%  0.40%  0.40%
 Carbon  1.50  1.50  1.50
 Acid Number*  0.05  0.25


*Acid number is determined at time of production. Prolonged storage will result in slight oxidation, which will produce an increase in acid number. The smaller particle size grades are more susceptible to surface oxidation. Acid number is expressed as an absolute value and is the mg of KOH required to neutralize the acid in a one-gram sample.
7、Molybdenum Disulfide Typical Particle Size and Sulk Density
 MoS2 Grade Fisher Numberμm   Particle Size Range by SEM, μm  Laser Median Particle Size , μm  Bulk Density
 Technical  3 to 4  < 1 to 100  <30  1.3 g/cm3
 Technical Fine  0.65 to 0.8  < 0.5 to 20  <6  0.4 g/cm3
 Super Fine  0.4 to 0.45  < 0.5 to 8  <1.5  0.3 g/cm3
8、Molybdenum Disulfide Packing
 Package  Package Size (Diameter*Height)  GW/NW  Drums per pallet
 Fiber Drum  36 cm * 48 cm  27.4kg / 25kg  18
 Iron Drum (lined)  40 cm * 70cm  57.6kg / 50 kg  8
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10、knowledge of Molybdenum Disulfide
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  • Effects of Synthesis Parameters on CVD Molybdenum Disulfide Growth
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  • Study and Evaluation on Dispersion of Molybdenum Disulfide in Aqueous Solution
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  • Influence of rhenium on the structural and optical properties of molybdenum disulfide
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  • Determining the structure of molybdenum disulfide nanoclusters
  • Process for producing high grade molybdenum disulfide powder
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  • Tunable Electronic and Dielectric Properties of Molybdenum Disulfide
  • In-plane and cross-plane thermal conductivities of molybdenum disulfide.
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  • A Mechanism of Vapor Effect on Friction Coefficient of Molybdenum Disulfide
  • Coating compositions containing molybdenum disulfide