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Molybdenum trioxide

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Products Intro: Product Name:Molybdenum trioxide
CAS:1313-27-5
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Products Intro: Product Name:Molybdenum trioxide
CAS:1313-27-5
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Products Intro: Product Name:Molybdenum trioxide
CAS:1313-27-5
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Products Intro: Product Name:Molybdenum trioxide
CAS:1313-27-5
Purity:AR,99.5% Package:839.3RMB/2.5KG
Molybdenum trioxide Basic information
Product Name:Molybdenum trioxide
Synonyms:Mo 1202T;mo1202t;Molybdena;Molybdenum anhydride;Molybdenum(VI) oxide, 99.95% (metals basis);Molybdenum(VI) oxide, Puratronic(R), 99.998% (metals basis excluding W), W 300ppm max;MOLYBDENIUM TRIOXIDE pure;Molybdenum(VI) oxide, Puratronic, 99.998% (metals basis excluding W), W 300ppm max
CAS:1313-27-5
MF:MoO3
MW:143.94
EINECS:215-204-7
Product Categories:metal oxide;reducer;Inorganics
Mol File:1313-27-5.mol
Molybdenum trioxide Structure
Molybdenum trioxide Chemical Properties
Melting point 795 °C(lit.)
Boiling point 1155 °C
density 4.692
Fp 1155°C subl.
storage temp. Store at +5°C to +30°C.
solubility 0.49g/l
form Sublimed Powder
color White to gray
Water Solubility 0.5 g/L (20 ºC)
Merck 14,6239
CAS DataBase Reference1313-27-5(CAS DataBase Reference)
NIST Chemistry ReferenceMolybdenum(vi) oxide(1313-27-5)
EPA Substance Registry SystemMolybdenum oxide (MoO3)(1313-27-5)
Safety Information
Hazard Codes Xn,Xi
Risk Statements 36/37-48/20/22-40
Safety Statements 22-23-25-36/37
WGK Germany 1
RTECS QA4725000
TSCA Yes
HazardClass 6.1
HS Code 28257000
Hazardous Substances Data1313-27-5(Hazardous Substances Data)
ToxicityLD50 orally in Rabbit: 2689 mg/kg LD50 dermal Rat > 2000 mg/kg
MSDS Information
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ACROS English
ALFA English
Molybdenum trioxide Usage And Synthesis
Chemical Propertiespale yellowish-green powder
Chemical PropertiesMolybdenum trioxide is an odorless, white crystalline powder that turns yellow when heated.
UsesUsed for trace metal analysis.
UsesMolybdenum(VI) oxide is used in catalyst compositions to carry out desulfurization of petroleum feedstocks and to remove nitrogen-containing compounds from petroleum fractions. Other uses of this oxide include preparation of various molybdate salts and as reagents for chemical analyses.
PreparationMolybdenum(VI) oxide is obtained by igniting molybdenum or its compounds in air:
2Mo + 3O2 → 2MoO3
2MoS2 + 7O2 → 2MoO3 + 4SO2
MoS2 + 4O2 → MoO3 + SO2 + SO3
Roasting the sulfide is carried out in a multiple-hearth roaster under controlled temperature and airflow. The product mixture is sublimed to obtain high purity oxide.
Purified molybdenum(VI) oxide also is made by prolonged heating of ammonium molybdate in air:
(NH4)2Mo2O7 → 2MoO3 + 2NH3 + H2O
An alternative method involves repeatedly evaporating a mixture of ammonium molybdate and nitric acid. Ammonium nitrate so formed is separated from the product molybdenum(VI) oxide by extraction with water:
(NH4)2Mo2O7 + 2HNO3 → 2MoO3 + 2NH4NO3 + H2O
UsesChiefly as a reagent for chemical analysis.
General DescriptionColorless to white or yellow odorless solid. Sinks in water.
Air & Water ReactionsInsoluble in water.
Reactivity ProfileMolybdenum trioxide reacts violently with chlorine trifluoride, lithium, potassium and sodium. Readily combines with acids and bases to form a series of polymeric compounds. Incompatible with interhalogens and metals. A violent detonation occurs when heated with molten magnesium.
HazardToxic material.
Health HazardCompound is relatively nontoxic. Dust irritates eyes.
Fire HazardFlash point data for Molybdenum trioxide are not available, but Molybdenum trioxide is probably non-flammable.
Safety ProfilePoison by ingestion, subcutaneous, and intraperitoneal routes. Human systemic effects by inhalation: pulmonary fibrosis and cough. Questionable carcinogen with experimental neoplastigenic data. A powerful irritant. Explodes on contact with molten magnesium. Violent reaction with interhalogens (e.g., bromine pentafluoride, chlorine trifluoride). Incandescent reaction with hot sodium, potassium, or lithium. When heated to decomposition it emits toxic fumes of Mo.
Potential ExposureMolybdenum trioxide is used in agriculture; manufacture of metallic molybdenum, ceramic glazes; enamels, pigments, and in analytical chemistry.
First aidMove victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a oneway valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.
ShippingUN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required.
Purification MethodsCrystallise it from water (1g/50mL) between 70o and 0o. The solubility in H2O is 0.1% at 18o, and 2% at 70o. It is a white powder which turns yellow reversibly on heating. It sublimes readily at 1155o/760mm. [Hein & Herzog Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1412 1965.]
IncompatibilitiesExplodes on contact with molten magnesium. Violent reaction with strong oxidizers, such as chlorine trifluoride; bromine pentafluoride. Not compatible with strong acids; active metals (sodium, potassium, lithium).
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