Ammonium metatungstate will decompose under high temperature conditions, and its decomposition temperature is affected by many factors, such as heating rate, atmosphere air pressure and impurities. The following is a detailed explanation of the decomposition conditions of ammonium metatungstate:
Decomposition temperature
The decomposition temperature of ammonium metatungstate is usually around 400°C-500°C under pure hydrogen atmosphere.
Different stages of decomposition temperature produce different products. For example, when the heat treatment temperature is at 200-300°C, all the water of crystallization and most of the ammonium ions are removed; a phase transition occurs at 300-350°C to produce stabilized tungsten oxide; when the heat treatment temperature rises to 500-550°C, a small amount of ammonium roots and bound water still remain undecomposed; and above 600°C, it decomposes completely into tungsten trioxide (WO3).
If the temperature is raised to 700°C and held for 2 hours, hollow mesoporous tungsten trioxide spheres can be obtained.
Decomposition Products
The main product is tungsten oxide (WO3), which can be used to prepare other tungstates and various tungsten alloys.
In addition to tungsten oxide, reaction products such as ammonia (NH3) and water (H2O) are produced during decomposition.
Influencing factors
Heating rate
Faster heating rates may result in a slight increase in decomposition temperature.
Atmospheric pressure
Decomposition temperatures are lower in pure hydrogen atmospheres, but may change in other atmospheres.
Impurities
The presence of impurities may affect the decomposition temperature and the purity of the decomposition products.
Applications
The thermal decomposition of ammonium metatungstate has application value in many fields, such as the preparation of tungstate ceramics, catalyst preparation and so on.
In summary, ammonium metatungstate decomposes at high temperature, and its decomposition temperature is affected by many factors and produces different products. These properties make ammonium metatungstate widely used in many industrial fields.
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