VANADIUM PENTOXIDE

Vanadium pentoxide is used as the catalyst for a variety of gas-phase oxidation processes, particularly the conversion of sulfur dioxide to sulfur trioxide during the manufacture of sulfuric acid. The most frequently used vanadium pentoxide catalyst contains 4–6% vanadium as vanadium pentoxide on a silica base.

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Detailed Description for VANADIUM PENTOXIDE

Vanadium pentoxide is also used in some pigments and inks used in the ceramics industry to impart a colour ranging from brown to green. Pigments and inks are made containing up to about 15% vanadium pentoxide, the higher-concentration ones being supplied in an oil base rather than as a dry powder.

Vanadium pentoxide can be used as a colouring agent and to provide ultraviolet filtering properties in some glasses. Normally, the vanadium content in the batch materials is less than 0.5%.

Vanadium compounds (pentoxide and certain vanadates) are used as catalyst in the oxidation of SO2 to SO3; ethanol to acetaldehyde; in the syntheses of phthalic and maleic anhydrides; in the manufacture of polyamides (nylon); sugar to oxalic acid, and anthracene to anthraquinone. It is also used for the manufacture of yellow glass; inhibiting UV light transmission in glass; depolarizer; as developer in photography; and as mordant in dyeing and printing fabrics and in manufacture of aniline black in form of ammonium vanadate.

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE Yellow to rust-brown flake or powder
MELTING POINT 690 C
BOILING POINT 1750 C (Decomposes)
SPECIFIC GRAVITY 3.357
SOLUBILITY IN WATER 0.10 g/100ml
pH  
VAPOR DENSITY 6.3

REFRACTIVE INDEX

 

NFPA RATINGS

Health: 3 Flammability: 0 Reactivity: 0

AUTOIGNITION

 

FLASH POINT 1750 C
STABILITY Stable under ordinary conditions

 

Vanadium pentoxide is used as the catalyst for a variety of gas-phase oxidation processes, particularly the conversion of sulfur dioxide to sulfur trioxide during the manufacture of sulfuric acid. The most frequently used vanadium pentoxide catalyst contains 4–6% vanadium as vanadium pentoxide on a silica base.

Vanadium pentoxide is also used in some pigments and inks used in the ceramics industry to impart a colour ranging from brown to green. Pigments and inks are made containing up to about 15% vanadium pentoxide, the higher-concentration ones being supplied in an oil base rather than as a dry powder.

Vanadium pentoxide can be used as a colouring agent and to provide ultraviolet filtering properties in some glasses. Normally, the vanadium content in the batch materials is less than 0.5%.


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