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Molybdenum trioxide

Molybdenum trioxide
Molybdenum trioxide structure
Chemical Name:
Molybdenum trioxide
MoO3;mo1202t;Mo 1202T;Molybdena;MOLYBDIC OXIDE;Molybdntrioxid;CATALYST DC-160;naturalmolybdite;MOLYBDENUM OXIDE;Natural molybdite
Molecular Formula:
Formula Weight:
MOL File:

Molybdenum trioxide Properties

Melting point:
795 °C(lit.)
Boiling point:
1155 °C
Flash point:
1155°C subl.
storage temp. 
Store at +5°C to +30°C.
Sublimed Powder
Specific Gravity
White to gray
Water Solubility 
0.5 g/L (20 ºC)
CAS DataBase Reference
1313-27-5(CAS DataBase Reference)
NIST Chemistry Reference
Molybdenum(vi) oxide(1313-27-5)
EPA Substance Registry System
Molybdenum oxide (MoO3)(1313-27-5)
  • Risk and Safety Statements
Signal word  Warning
Hazard statements  H301-H335-H319-H351
Precautionary statements  P304+P340+P312-P261-P281-P305+P351+P338-P201-P301+P310a-P405-P501a
Hazard Codes  Xn,Xi
Risk Statements  36/37-48/20/22-40
Safety Statements  22-23-25-36/37
WGK Germany  1
RTECS  QA4725000
HazardClass  6.1
HS Code  28257000
Toxicity LD50 orally in Rabbit: 2689 mg/kg LD50 dermal Rat > 2000 mg/kg

Molybdenum trioxide price More Price(30)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 203815 Molybdenum(VI) oxide 99.97% trace metals basis 1313-27-5 5g $64.4 2018-11-13 Buy
Sigma-Aldrich 203815 Molybdenum(VI) oxide 99.97% trace metals basis 1313-27-5 25g $241 2018-11-13 Buy
Alfa Aesar 010812 Molybdenum(VI) oxide, Puratronic?, 99.998% (metals basis excluding W), W 300ppm max 1313-27-5 100g $194 2018-11-16 Buy
Alfa Aesar 010812 Molybdenum(VI) oxide, Puratronic?, 99.998% (metals basis excluding W), W 300ppm max 1313-27-5 25g $67.1 2018-11-16 Buy
Strem Chemicals 42-1475 Molybdenum(VI) oxide (99.998%-Mo) PURATREM 1313-27-5 10g $42 2018-11-13 Buy

Molybdenum trioxide Chemical Properties,Uses,Production

Chemical Properties

pale yellowish-green powder

Chemical Properties

Molybdenum trioxide is an odorless, white crystalline powder that turns yellow when heated.


Chiefly as a reagent for chemical analysis.


Used for trace metal analysis.


Molybdenum(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.


Molybdenum trioxide (MnO3) is a compound used to make enamels adhere to metals.


Molybdenum(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

General Description

Colorless to white or yellow odorless solid. Sinks in water.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

Molybdenum 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.


Toxic material.

Health Hazard

Compound is relatively nontoxic. Dust irritates eyes.

Fire Hazard

Flash point data for Molybdenum trioxide are not available, but Molybdenum trioxide is probably non-flammable.

Safety Profile

Poison 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 Exposure

Molybdenum trioxide is used in agriculture; manufacture of metallic molybdenum, ceramic glazes; enamels, pigments, and in analytical chemistry.


UN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required.

Purification Methods

Crystallise 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.]


Explodes 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).

Molybdenum trioxide Preparation Products And Raw materials

Raw materials

Preparation Products

Molybdenum trioxide Suppliers

Global( 250)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23049 58
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32447 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1861 55
career henan chemical co
+86-371-86658258 CHINA 30002 58
+86 18953170293
+86 0531-67809011 CHINA 2995 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23976 58
Haihang Industry Co.,Ltd
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Hubei Jusheng Technology Co.,Ltd North:18871490274,QQ:1400878000 South:18871490354,QQ:1400868000
FAX:1400878000 China 9866 58
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 24986 65

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View Lastest Price from Molybdenum trioxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-11 Molybdenum trioxide
US $1.00 / KG 1KG 99% 25kg career henan chemical co

Molybdenum trioxide Spectrum

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