Stoichiometric ratio tungsten oxide, usually refers to tungsten trioxide (WO3), in which the atomic ratio of tungsten (W) and oxygen (O) strictly conforms to the stoichiometric ratio, i.e., each tungsten atom combines with three oxygen atoms to form a stable compound.
- Definition and chemical formula of tungsten oxide with stoichiometric ratio
Definition of stoichiometric ratio of tungsten oxide
Stoichiometric ratio of tungsten oxide means that the atomic ratio of tungsten and oxygen in tungsten oxide strictly follows the stoichiometric law, i.e. WO3.
Chemical formula of stoichiometric ratio tungsten oxide
WO3, indicating that each tungsten atom is chemically bonded to three oxygen atoms.
Physical properties of tungsten oxide in stoichiometric ratio
The color and form of stoichiometric tungsten oxide
Stoichiometric ratio of tungsten oxide is usually light yellow or yellow crystalline powder, with triclinic or tetragonal crystal structure. When the temperature is higher than 740℃, it will change to orange tetragonal crystal system, and return to its original state after cooling.
Stability of stoichiometric ratio of tungsten oxide
Stable in air, melting point is 1473℃, boiling point is higher than 1750℃, relative density is 7.16.
Third, stoichiometric ratio of tungsten oxide chemical properties
Solubility of tungsten oxide
Stoichiometric ratio of tungsten oxide is insoluble in water and inorganic acids except hydrofluoric acid, but it can be dissolved in hot concentrated sodium hydroxide solution and ammonia to produce soluble tungstate.
Redox properties of stoichiometric tungsten oxide
At high temperature, stoichiometric tungsten oxide can be reduced by reducing agents such as hydrogen (H2) or carbon (C) to produce tungsten powder or low-valent tungsten oxide, respectively.
Catalytic properties of stoichiometric tungsten oxide
Stoichiometric tungsten oxide has certain catalytic activity, especially in redox reactions and acid-base catalyzed reactions. It can be used as a component of catalyst to promote the chemical reaction.
Application fields of stoichiometric tungsten oxide
Powder metallurgy
Stoichiometric ratio of tungsten oxide is the raw material of powder metallurgy for the production of cemented carbide and tungsten products.
Catalyst
In the petroleum industry, it can be used as a component of catalyst to promote the chemical reaction.
Electrochemistry
Stoichiometric tungsten oxide also shows good application prospects in electrochemical fields such as lithium-ion batteries and supercapacitors.
Photocatalysis
Due to its high absorption rate of light and photocatalytic activity, stoichiometric tungsten oxide can also be used in photocatalytic water decomposition, photocatalytic organic reaction and other fields.
- Precautions for stoichiometric tungsten oxide
In practical applications, due to the existence of oxygen deficiency phenomenon, tungsten oxide prepared exactly according to the stoichiometric ratio may not be common. Therefore, when describing tungsten oxide, WO3-x (x=0 to 1) is sometimes used to indicate its non-stoichiometric ratio state.
The properties and applications of stoichiometric ratio tungsten oxide may be affected by factors such as its crystal structure, purity and preparation method. Therefore, its properties need to be evaluated and utilized in specific applications according to the actual needs and reaction conditions.
In summary, stoichiometric tungsten oxide is an important inorganic compound with a wide range of applications in several fields.
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