Vanadium(V) oxide Chemical Properties

Melting point:

690 °C

Boiling point:

3380 °C(lit.)

Density 

3.35 g/mL at 25 °C(lit.)

vapor pressure 

8 mm Hg ( 20 °C)

Flash point:

1750°C

storage temp. 

Poison room

solubility 

H₂O: soluble

form 

turnings

color 

Orange

Specific Gravity

3.357

Odor

at 100.00?%. odorless

PH

4 (50g/l, H2O, 20℃)(slurry)

Water Solubility 

1 g/125 mL

Merck 

14,9921

crystal system

Nogata

Space group

Pmmn

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.3564	1.1519	0.4373	90	90	90	0.1795

Exposure limits

OSHA: Ceiling 0.5 mg/m3; Ceiling 0.1 mg/m3
NIOSH: TWA 1 mg/m3; STEL 3 mg/m3; Ceiling 0.05 mg/m3

Stability:

Stable. Incompatible with chlorine, chlorates, acids, alkali metals, interhalogens.

CAS DataBase Reference

1314-62-1(CAS DataBase Reference)

IARC

2B (Vol. 86) 2006

NIST Chemistry Reference

Vanadium(v) oxide(1314-62-1)

EPA Substance Registry System

Vanadium pentoxide (1314-62-1)

Safety Information

Hazard Codes 

Xi,N,T,C,T+

Risk Statements 

36/38-68-63-51/53-48/23-37-20/22-41-48/20-34-40-26/27/28

Safety Statements 

26-61-45-38-36/37-36-36/37/39-23

RIDADR 

UN 3289 6.1/PG 2

OEL

Ceiling: 0.05 mg V/m3 [15-minute]

WGK Germany 

3

RTECS 

YW1355000

F 

10

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

HS Code 

28253010

Hazardous Substances Data

1314-62-1(Hazardous Substances Data)

Toxicity

LD50 orally in Rabbit: 400 - 500 mg/kg LD50 dermal Rat > 2000 mg/kg

IDLA

35 mg V/m3

MSDS

• Language:English Provider:Divanadium pentaoxide
• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Vanadium(V) oxide Usage And Synthesis

Physical properties

Brown-yellow orthorhombic crystals; density 3.35 g/cm3; melts at 670°C; decomposes at 1,800°C; slightly soluble in water, 0.8g/100 mL at 20°C; soluble in concentrated acids forming an orange-yellow solution; soluble in alkalies forming vanadates.

Uses

Vanadium(V) oxide is the oxide form of vanadium. As an important vanadium compound, it is used as the major precursor to alloys of vanadium and is widely used as industrial catalyst. It can be used for the production of ferrovanadium and sulfuric acid. It can also catalyze the oxidation reaction of some anhydrides. It can also be used as a detector material in bolometer arrays for thermal imaging because of its thermal resistance. Vanadium(V) oxide is also a kind of highly selective and stable ethanol sensor materials. Moreover, the microspheres of vanadium(V) oxide formed during the synthesis of vanadium(V) oxide nanorods in a mediated polyol process exhibit excellent electrochemical properties when used as the cathode material in a lithium-ion battery.
Other applications are in making yellow glass; as a depolarizer; as a developer in photography; inhibiting UV transmission in glass;and coloring ceram; as a mordant for dyeing and printing fabrics.

Preparation

Vanadium pentoxide is an intermediate in recovering vanadium from minerals (See Vanadium). Sodium polyvanadate, obtained as a red cake in one of the steps in extracting vanadium from its ores is calcined at 700°C in air to form a melt of vanadium pentoxide. Pentoxide is prepared in purified form by dissolving red cake in sodium carbonate solution followed by addition of an aqueous solution of ammonia and ammonium chloride. Ammonium metavanadate is precipitated which on decomposition at 320 to 430°C forms vanadium pentoxide.

References

Liu, J, et al. "Vanadium Pentoxide Nanobelts: Highly Selective and Stable Ethanol Sensor Materials." Advanced Materials 17.17(2005): 764-767.
Cao, A. M., et al. "Self-assembled vanadium pentoxide (V2O5) hollow microspheres from nanorods and their application in lithium-ion batteries." Angewandte Chemie 44.28(2005): 4391.
Moskalyk, R. R., and A. M. Alfantazi. "Processing of vanadium: a review." Minerals Engineering 16.9 (2003): 793-805.
Khorfan, S., A. Wahoud, and Y. Reda. "Recovery of vanadium pentoxide from spent catalyst used in the manufacture of sulphuric acid." Periodica Polytechnica. Chemical Engineering 45.2 (2001): 131.
Friedrichsen, Wilhelm, and Otto Goehre. "Supported catalysts containing vanadium pentoxide and titanium dioxide and their use for the production of carboxylic acids and carboxylic anhydrides." U.S. Patent No. 3,684,741. 15 Aug. 1972.
Karunagaran, B., et al. "Study of a pulsed laser deposited vanadium oxide based microbolometer array." Smart materials and structures 12.2 (2003): 188.

Description

Vanadium pentoxide is a yellow to red colour solid and is odourless. Vanadium pentoxide dust is the particulate form of a non-combustible, odourless, yellow-orange or dark grey crystalline solid.
On decomposition by heating, vanadium pentoxide produces toxic fumes. Vanadium is widely distributed in the Earth’s crust in a wide range of minerals and in fossil fuels. Vanadium pentoxide, the major commercial product of vanadium, is mainly used in the production of alloys with iron and aluminium. It is also used as an oxidation catalyst in the chemical industry and in a variety of minor applications.

Chemical Properties

Vanadium pentoxide dust is an odorless, yellow to red crystal, or powder; or fume (when vanadium is heated). Vanadium pentoxide fume is a finely divided particulate dispersed in air.

Chemical Properties

A yellow to rust-brown or orange crystals or powder. Slightly soluble in water and denser than water. Contact may cause severe irritation to skin, eyes, and mucous membranes. May be toxic by ingestion, inhalation and skin absorption.

Uses

As catalyst in the oxidation of SO2 to SO3, alcohol to acetaldehyde, etc.; for the manufacture of yellow glass; inhibiting ultraviolet light transmission in glass; depolarizer; as developer in photography; in form of ammonium vanadate as mordant in dyeing and printing fabrics and in manufacture of aniline black.

Uses

Vanadium pentoxide (V2O5) is a reddish-yellow powder extracted from minerals using strong acids or alkalies. In addition to being used as a catalyst for many organic chemical reactions, it is used in photography and in UV-protected windowpanes and to color ceramics and dye cloth.

Uses

In the production of high-strength steel alloys; catalyst in oxidation reactions; in pesticides; in dyes and inks.

Uses

Vanadium(V) oxide is used in Vacuum deposition, catalysts for conversion of toluene to benzonitrile or propylene to acrylonitrile, as a detector material in bolometers and microbolometer arrays for thermal imaging.

Definition

vanadium pentoxide: A crystalline compound,V₂O₅, used extensively as a catalyst inindustrial gas-phase oxidationprocesses.

Reactivity Profile

Vanadium pentoxide is acidic in many reactions. Hence, soluble in bases. [Kirk-Othmer]. Can react with ClF3, Li, peroxyformic acid and (Ca+S+H2O). Also reacts with strong acids.

Hazard

The compound is toxic by ingestion, inhalation, and contact. Inhalation can cause asthma, cough, dyspnea, and bronchial constriction. Ingestion can cause gastrointestinal tract disturbances. Other toxic symptoms are skin pallor, greenish-black tongue, and papular skin rash (Lewis, R.J. (Sr) 1996. Sax’s Dangerous Properties of Industrial Materials, 9thed. New York: Van Nostrand Reinhold).
The oral LD₅₀ for V₂O₅ dust in rats is 10 mg/kg and the inhalation LCLO in rats is 70 mg/m³/2hr.

Health Hazard

Probable oral lethal dose for humans is between 5 and 50 mg/kg or between 7 drops and 1 teaspoonful for a 70 kg (150 lb.) person. Toxicity is about the same magnitude as pentavalent arsenic. A person with chronic respiratory disease is at greater risk when exposed to this substance.

Fire Hazard

Container may explode in heat of fire. When heated to decomposition, Vanadium pentoxide emits acrid smoke and fumes of vanadium oxides. Material is not flammable but Vanadium pentoxide may increase the intensity of the fire when in contact with combustible materials. Avoid chlorine trifluoride; lithium; peroxyformic acid; and calcium, sulfur, water complexes. Hazardous polymerization may not occur.

Safety Profile

Poison by ingestion, inhalation, intraperitoneal, subcutaneous, intratracheal, and intravenous routes. An experimental teratogen. Human systemic effects by inhalation: bronchiolar constriction, including asthma, cough, dpspnea, sputum, and conjunctiva irritation. Experimental reproductive effects. Mutation data reported. A respiratory irritant; causes skin pallor, greenish-black tongue, chest pain, cough, dyspnea, palpitation, lung changes. When ingested it causes gastrointestinal tract disturbances. May also cause a papular skin rash. Mixtures with calcium + sulfur + water may ignite spontaneously. The absorption of V2O5 by inhalation is nearly 100%. Incompatible with ClF3, Li, peroxyformic acid. When heated to decomposition it emits acrid smoke and irritating fumes of VOx. See also VANADIUM COMPOUNDS.

Potential Exposure

(dust); Suspected reprotoxic hazard, Suspected of causing genetic defects, Primary irritant (w/o allergic reaction), (fume) Possible risk of forming tumors, Vanadium pentoxide is an industrial catalyst in oxidation reactions; is used in glass and ceramic glazes; is a steel additive; and is used in welding electrode coatings.

Carcinogenicity

Vanadium pentoxide was not mutagenic in Salmonella strains and did not increase the frequency of micronucleated erythrocytes in mice.9 In other studies vanadium compounds have produced clear evidence of aneuploidy in somatic cells after exposure by several different routes.

Shipping

UN2862 Vanadium pentoxide, nonfused form, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Incompatibilities

Strong acids; lithium, chlorine trifluoride; peroxyformic acid; combustible substances.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal. Vanadium pentoxide may be salvaged or disposed of in a sanitary landfill.

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