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Molybdenum Trioxide CAS 1313-27-5

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  • Appearance: White powder
  • Assay: 99. 0%min
  • Stock: In stock
  • Sample: Available
  • Zhishang Chemical: Molybdenum Trioxide Supplement
1313-27-5

Basic Info of Molybdenum Trioxide

What is Molybdenum Trioxide?

Molybdenum trioxide (MoO3), also known as molybdenum anhydride, has a molecular weight of 143.94. White transparent orthorhombic crystal with light green microstrips, turns yellow when heated, and returns to its original color after cooling. The density is 4.692g/cm3, the melting point is 795℃, the boiling point is 1155℃, and it is easy to sublime. Insoluble in water, soluble in ammonia water and strong alkali solution to generate molybdate. It is soluble in strong acid and forms a complex cation with molybdenum dioxygen (MoO22+) and molybdenum oxide (MoO4+), and can form a soluble complex with acid radical. The oxidizing property is very weak and can be reduced by hydrogen, carbon and aluminum at high temperature. Reacts with phosphoric acid to generate phosphomolybdic acid.

It is very stable in the air. Dry hydrogen chloride is introduced into it, and it is heated and sublimated into pale yellow needle-like crystals. Reacts violently with halogen compounds such as bromine pentafluoride and chlorine trifluoride. It is decomposed by high heat and emits toxic fumes. Molybdenum trioxide can be used as analytical reagent, raw material for preparing metal molybdenum, molybdenum alloy and molybdenum salt; used as catalyst in petroleum industry; used in enamel, glaze, pigment and medicine, etc. It is prepared by burning molybdenum or molybdenum disulfide in air or roasting molybdic acid.

Molybdenum Trioxide Uses

  1. Molybdenum trioxide is used for colorimetric determination of blood glucose, protein, phenol, arsenic, lead, bismuth, etc., and alkaloid testing. Used as reducing agent for phosphorus pentoxide, arsenic trioxide, hydrogen peroxide, phenol and alcohol. It is also used in the preparation of molybdenum salts and molybdenum alloys.
  2. Molybdenum trioxide is used as the raw material for the preparation of metal molybdenum and molybdenum compounds. Used as a catalyst in the petroleum industry. It can also be used in enamel, glaze, paint, medicine, etc.
  3. Molybdenum trioxide is an additive flame retardant, which has the dual functions of flame retardant and smoke suppression. It can reduce costs, improve flame retardancy and reduce the amount of smoke when compounded with other flame retardants. Molybdenum trioxide also has the dual effects of flame retardant and smoke suppression, and it shows a certain synergistic effect with aluminum hydroxide trihydrate and antimony oxide.
  4. Spectral analysis reagents. Detection of blood sugar, protein, alkaloids, arsenic, phenol. Reducing agent for phosphorus pentoxide, arsenic trioxide and hydrogen peroxide.
  5. Molybdenum trioxide is used for electroplating or metal oxide addition in the preparation of molybdate.

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Application of Molybdenum Trioxide

Molybdenum dioxide sputtered film. First, molybdenum dioxide powder containing MoO290%~99.5% is isostatically pressed into a pole plate at 7~28MPa, and then sintered in a vacuum furnace at 1250 ℃ for 6h to form a molybdenum dioxide target blank, and then magnetron sputtering or Pulsed laser sputtering or ion beam sputtering sputters molybdenum dioxide onto substrates, which can be plastic materials, broken glass substrates, ceramic substrates and hybrid materials. The plastic substrate is polynorbornene, and the ceramic substrate is sapphire (Al2O3). Molybdenum dioxide is deposited on the substrate to form a thin film of molybdenum dioxide with a thickness of 0.5 to 10 μm, and then the work function of molybdenum dioxide is measured. Generally, the work function of light-emitting diode materials such as indium-tin oxide (ITO) is required. A typical value is 4.7eV.

The work function of the molybdenum dioxide sputtered film is determined to be 4.7-6 eV, which is higher than that of the indium-tin oxide film. In addition, the surface roughness of molybdenum dioxide film is lower than that of indium-tin oxide, and its roughness is less than 5nm. At wavelengths of 350-800 nm, the transmittance of the molybdenum dioxide film is greater than 85%. The resistivity is less than 300μΨcm. The research results show that molybdenum dioxide film has excellent electrical properties, optical properties and physical surface smoothness, and can be widely used in light emitting diodes (OLEDs), liquid crystal display devices (LCDs), plasma display panels (PDPs), field radiation Display panels (FED), thin film solar cells, low resistance ohmic contact materials and other electronic and semiconductor materials. It should be said that the research on molybdenum dioxide film is currently in its infancy, and the research will become more extensive and in-depth.

Preparation of Molybdenum Trioxide

MoO 3 is produced industrially by roasting molybdenum disulfide (the main ore of molybdenum):
2 MoS 2 + 7 O 2 → 2 MoO 3 + 4 SO 2
Laboratory synthesis of dihydrate requires acidification of sodium molybdate aqueous solution with perchloric acid:
Na 2 MoO 4 + H 2 O + 2 HClO 4 → MoO 3 (H 2 O) 2 + 2 NaClO 4
Dihydrate is easy to lose water to get monohydrate. Both are bright yellow.
Molybdenum trioxide is slightly soluble in water to form “molybdic acid”. In alkali, it dissolves to obtain molybdate anion.

Reference

  1. Molybdenum trioxide – ChemicalBook
  2. Molybdenum trioxide – PubChem

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