ChemicalBook > CAS DataBase List > Molybdenum(IV) oxide

Molybdenum(IV) oxide

Product Name: Molybdenum(IV) oxide
CAS No.: 18868-43-4
Chemical Name: Molybdenum(IV) oxide
Synonyms: MOLYBDENUM OXIDE;MoO2;MOLYBDENUM DIOXIDE;Molybdenum(IV) oxide, 99.95%;ioxomolybdenum;Molybdaendioxid;dioxomolybdenum;diketomolybdenum;MOLYBDENUM (IV) OXID;Molybdenum(IV)dioxide
CBNumber: CB3140754
Molecular Formula: MoO2
Formula Weight: 127.94
MOL File: 18868-43-4.mol

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Molybdenum(IV) oxide Property

Melting point:

decomposes [JAN85]

Density

6.47 g/mL at 25 °C (lit.)

storage temp.

Store at room temperature, keep dry and cool

solubility

insoluble in H2O, acid solutions, alkaline solutions

form

Powder

color

Red-brown

Specific Gravity

6.47

Water Solubility

slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93]

Crystal Structure

MoO2 type

crystal system

Monoclinic

Space group

P21/c

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.55388	0.48562	0.56285	90	119.683	90	0.1315

Exposure limits

ACGIH: TWA 10 mg/m3; TWA 3 mg/m3
NIOSH: IDLH 5000 mg/m3

InChIKey

QXYJCZRRLLQGCR-UHFFFAOYSA-N

CAS DataBase Reference

18868-43-4(CAS DataBase Reference)

EPA Substance Registry System

Molybdenum oxide (MoO2) (18868-43-4)

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Safety

Hazard Codes: Xn
Risk Statements: 20/21/22-36/37/38
Safety Statements: 26-36
WGK Germany: 1
RTECS: QA4688000
TSCA: Yes
HS Code: 28257000
Toxicity: mouse,LD50,subcutaneous,318mg/kg (318mg/kg),Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva im. D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. Vol. 19, Pg. 186, 1974.

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P337+P313IF eye irritation persists: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 234761
Product name: Molybdenum(IV) oxide
Purity: 99%
Packaging: 10g
Price: $37.9
Updated: 2025/07/31

Sigma-Aldrich

Product number: 234761
Product name: Molybdenum(IV) oxide
Purity: 99%
Packaging: 50g
Price: $104
Updated: 2025/07/31

Strem Chemicals

Product number: 93-4246
Product name: Molybdenum(IV) oxide, 99%
Packaging: 10g
Price: $24
Updated: 2024/03/01

Strem Chemicals

Product number: 93-4246
Product name: Molybdenum(IV) oxide, 99%
Packaging: 50g
Price: $75
Updated: 2024/03/01

Sigma-Aldrich

Product number: 711209
Product name: Molybdenum(IV) oxide
Purity: 97%
Packaging: 10g
Price: $37.6
Updated: 2023/06/20

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Molybdenum(IV) oxide Chemical Properties,Usage,Production

Chemical Properties

Lead-gray, nonvolatile powder. Dapproximately 6.4. Insoluble in hydrochloric acidand hydrogen fluoride and alkalies, sparingly solu-ble in sulfuric acid.

Physical properties

Molybdenum(IV) oxide can be prepared by several methods including controlled oxidation of Mo and controlled reduction of MoO3 with hydrogen. The pure oxide suitable for structure determination has been prepared by electrolysis of a polymolybdate (K2O5.MoO3) solution. Molybdenum(IV) oxide is insoluble in water: it is inert in solutions of nonoxidizing acids or bases, but is dissolved by oxidizing solutions. It dissociates to Mo and MoO3 at high temperatures (~ 1100°).
Crystalline MoO2 is violet or brown. Its deformed rutile structure consists of infinite chains of MoO6 octahedra sharing opposite edges along the chain direction with Mo-Mo distances alternately long (3.10 A) and short (2.50 A). It is diamagnetic and semiconducting ; metal-metal bonds are present. Some of its thermodynamic properties are as follows: G°f29% ~ 172.415 kcal/mole H°f29% -140.5 kcal/mole S°298 11.954 gibbs/mole.

Uses

Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C.
MoO2 can be used in a variety of energy based applications such as an anode material in rechargeable lithium batteries and fuel flexible solid oxide fuel cells.It can also be used as a catalyst in hydrogen reforming processes.

Uses

Molybdenum(IV) oxide is used to catalyze the dehydrogenation of alcohols. It is also used as an intermediates and processing aids. It finds application in the manufacture of molybdenum nano-wires.

Preparation

Molybdenum(IV) oxide is obtained by passing steam over red hot molybdenum:
Mo + 2H2O → MoO2 + 2H2
Alternatively, the oxide may be prepared by heating a molybdate salt, such as ammonium molybdate, with a reducing agent such as zinc. The dioxide also may be obtained along with other oxides of molybdenum when molybdenum metal is heated in air.
A brown-black suspension of MoO2 in hydrate form may be obtained by reducing a solution of ammonium molybdate with hydrogen in the presence of colloidal palladium.

General Description

Molybdenum(IV) oxide (MoO₂) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO₃ in dry hydrogen in the temperature range of 450-550°C.

Hazard

Toxic material.

reaction suitability

reagent type: catalyst
core: molybdenum

Safety Profile

Poison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo.

Toxics Screening Level

The screening level for the elemental molybdenum and insoluble molybdenum compounds is 30 μg/m3 while the screening level for soluble molybdenum compounds is 5 μg/m3 based on an 8 hour averaging time.

Molybdenum(IV) oxide Preparation Products And Raw materials

Raw materials

Preparation Products

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View Lastest Price from Molybdenum(IV) oxide manufacturers

Hebei Chuanghai Biotechnology Co., Ltd

Product: Molybdenum(IV) oxide 18868-43-4
Price: US $10.00/KG
Min. Order: 1KG
Purity: 99%
Supply Ability: 10 mt
Release date: 2024-11-20

Career Henan Chemical Co

Product: Molybdenum(IV) oxide 18868-43-4
Price: US $8.80/KG
Min. Order: 1KG
Purity: 97%-99%
Supply Ability: 100kg
Release date: 2019-07-12

18868-43-4, Molybdenum(IV) oxideRelated Search:

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18868-43-4

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