The decomposition products of ammonium metatungstate vary according to its decomposition temperature and conditions. The following is a detailed explanation of the decomposition products of ammonium metatungstate:
Decomposition Temperature and Products
When the heat treatment temperature is under 200-300°C, ammonium metatungstate removes all of the water of crystallization and most of the ammonium ions.
At a temperature of 300-350°C, ammonium metatungstate undergoes a phase transition to produce stabilized tungsten oxide.
When the heat treatment temperature rises to 500-550°C, there is still a small amount of ammonium root and binding water that is not decomposed.
When the heat treatment temperature reaches above 600°C, ammonium metatungstate decomposes completely into tungsten trioxide (WO3).
If the temperature is further increased to 700°C and held for 2 hours, hollow mesoporous tungsten trioxide spheres can be obtained.
Main Products
Tungsten trioxide (WO3) is the main product of high temperature decomposition of ammonium metatungstate. Tungsten trioxide is an important tungsten compound, which is widely used in ceramics, electronics, catalysts and other fields.
Other products
In the decomposition process, besides tungsten trioxide, products such as ammonia (NH3) and water (H2O) are also produced.
Influencing factors
Factors such as decomposition temperature, heating rate, atmosphere pressure and purity of raw materials will affect the decomposition process and products of ammonium metatungstate.
Ammonium metatungstate decomposes at different temperatures to produce different products, the main product is tungsten trioxide (WO3), and ammonia (NH3) and water (H2O) are also produced. These products have important applications in many industrial fields.
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