Basic information
- CAS
18868-43-4- Standard SMILES
[O]=[Mo]=[O]- InChIKey
QXYJCZRRLLQGCR-UHFFFAOYSA-N- Molecular formula
- MoO2
- Average molar mass
- 127.95 g/mol
- Monoisotopic mass
- 129.89523744
Names & identifiers
- Preferred name
- Molybdenum dioxide
- IUPAC
- dioxomolybdenum
- English name
- Molybdenum(IV) oxide
- Molecular formula
- MoO2
- Molecular weight
- 127.94
Names & synonyms
Molybdenum dioxide18868-43-4Molybdenum(IV) oxideMolybdenum oxide (MoO2)MoO2DTXSID10879986RefChem:819145DTXCID3022162242-637-9dioxomolybdenumMOLYBDENUM (IV) OXIDEMFCD00014223
Show more names
MOLYBDENUM OXIDEMolybdenum(IV) oxide, 99.95%ioxomolybdenumMolybdaendioxidMOLYBDENUM (IV) OXIDMolybdenum(IV)dioxide
EINECS 242-637-9DiketomolybdenumBis(oxido)molybdenumEC 242-637-9Molybdenum(IV) oxide, 97%Molybdenum(IV) oxide, 99%SCHEMBL129727Q415673
Database identifiers
- CAS
18868-43-4- PubChem CID
- 29320
- DTXSID
DTXSID10879986- EC Number
- 242-637-9
- Nikkaji
- J1.270.094F、J96.263E
Properties
Computed structural properties
- Topological polar surface area
- 34.1 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 2
- Rotatable bonds
- 0
- Heavy atoms
- 3
- Formal charge
- 0
- Complexity
- 18.3
Experimental & physicochemical properties
Chemical ClassesMetals -> Metals, Inorganic Compounds
SpringerMaterials Propertiesdielectric constant
Physical Description
CBI
Lead-gray solid; [Hawley] Red-brown odorless powder; Insoluble in water; [MSDSonline] Solid (dark blue crystals) that is a metallic conductor and weakly paramagnetic; [Ullmann]
Physicochemical properties
- Melting point
- 85 · decomposes [JAN85]
- Density
- 6.47 g/mL · 6.47 g/mL at 25 °C (lit.)
- storage temp.
- Store at room temperature, keep dry and cool
- solubility
- 2 O, · insoluble in H2O, acid solutions, alkaline solutions
- form
- Powder
- color
- Red-brown
- Specific Gravity
- 6.47 · 6.47
- Water Solubility
- 2 SO4; · slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93]
- Specific Heat Capacity
- 0.44 J/ · Cp(crystal): 0.44 J/(g·K), at 25℃
- Crystal Structure
- 2 type · MoO2 type
- crystal system
- Monoclinic
- Space group
- 21 · P21/c
- Lattice constant
- a/nm
- Symbol(GHS)
- 7 · GHS07
- Signal word
- Warning
- Hazard statements
- 315 · H315-H319
- Precautionary statements
- 264 · P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
- PPE
- 95 · dust mask type N95 (US), Eyeshields, Gloves
- Hazard Codes
- Xn
- Risk Statements
- 20 · 20/21/22-36/37/38
- Safety Statements
- 26 · 26-36
- WGK Germany
- 1 · 1
- RTECS
- 4688000 · QA4688000
- TSCA
- TSCA listed
- HS Code
- 28257000 · 28257000
- Storage Class
- 11 · 11 - Combustible Solids
- Toxicity
- 50 · 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.
- REACH Registrations
- Active
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 91.9% (57 of 62) of all reports.
Not Classified
Aggregated GHS information provided per 62 reports by companies from 4 notifications to the ECHA C&L Inventory.
Hazard information
Regulatory Information
Chemical: Molybdenum oxide (MoO2)
Molybdenum oxide (MoO2) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Molybdenum oxide (MoO2) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
Status: Active Update: 30-07-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/10167
Hazards SummaryAn irritant; [MSDSonline] See Molybdenum.
Hazard Classes and CategoriesNot Classified
Safety & protection
Threshold Limit Values (TLV)10.0 [mg/m3], as Mo, inhal. fraction, 3 mg/m3, as Mo, respir. fraction (metal and insol. compds)
Permissible Exposure Limit (PEL)15.0 [mg/m3], as Mo, total dust (metal and insol. compds.)
Protective Action Criteria (PAC)
40 [mg/m3]
440 [mg/m3]
2600 [mg/m3]
Safety data
- PPE
- dust mask type N95 (US), Eyeshields, Gloves
- wgk
- 1
- tsca
- TSCA listed
- rtecs
- QA4688000
- 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.
- risk_code
- 20/21/22-36/37/38
- Signal word
- Warning
- Symbol(GHS)
- GHS07
- hazard_code
- Xn
- safety_code
- 26-36
- Storage Class
- 11 - Combustible Solids
- Hazard statements
- H315-H319
- REACH Registrations
- Active
- Precautionary statements
- P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
Chemistry & industry
Uses & manufacturing
U.S. Production2023: 1,000,000 - <8,500,000 lb
Industry UsesIntermediate
General Manufacturing Information
Primary Metal Manufacturing
Molybdenum oxide (MoO2): ACTIVE
Applications
UsesMolybdenum(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.
UsesMolybdenum(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.
General DescriptionMolybdenum(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.
Preparation methods
PreparationMolybdenum(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.
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Related reactions
3 records
Compound notes
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