Ammonium tungsten oxide is a chemical substance, its detailed information is as follows:
- Basic information
Chinese name
Ammonium tungsten oxide
Foreign name
Ammonium Tungsten Oxide
Alias
Ammonium tungsten oxide hydrate, Ammonium tungsten oxidehydrate
Chemical formula
The common form is (NH4)6W12O39-xH2O, but it should be noted that there may be other molecular formulas such as W12O41N10H42 (CAS No. 11140-77-5), depending on the degree of hydration and preparation process.
Molecular weight
The molecular weight varies according to the chemical formula, e.g. (NH4)6W12O39-xH2O has a molecular weight of 2938.41.
CAS No.
The main used CAS number is 12028-48-7.
Physical Properties
Appearance
White crystalline powder
Solubility
Soluble in water, insoluble in alcohol, aqueous solution is weakly acidic
Chemical Properties
Ammonium tungsten oxide has specific chemical properties which make it widely used in industry.
Uses
Ammonium tungsten oxide is mainly used in the preparation of tungsten catalysts, which play an important role in the process of petroleum hydrocracking, lubricating oil hydrotreating, desulfurization, denitrogenation and so on. In addition, it is also used in the surface coating of various metal products and the manufacture of cemented carbide.
- Production Methods
Ammonium tungsten oxide is produced by various methods, including neutralization method, tungstic acid method, thermal decomposition method, solvent extraction method and ion exchange method, etc. Among them, neutralization method, tungstic acid method and ion exchange method are used. Among them, neutralization method, tungstic acid method and thermal decomposition method are the main methods of industrialized production in China.
Neutralization method
It is produced by a series of chemical reactions with ammonium sec-metatungstate and nitric acid as raw materials.
Tungstic acid method
Dissolve tungstic acid with ammonia, and then through a series of acid and alkali adjustment and heating and concentration steps to produce.
Thermal decomposition method
Ammonium paratungstate is used as raw material, decomposed under high temperature and produced through subsequent treatment.
- Safety Information
Ammonium tungsten oxide is generally slightly hazardous to water bodies, so undiluted or large quantities of the product should be avoided in contact with groundwater, watercourses or sewage systems during use and storage.
Do not discharge the material into the surrounding environment without government authorization.
In summary, ammonium tungsten oxide is an important chemical substance with a wide range of industrial applications. At the same time, due to its specific chemical properties and potential hazards, it requires appropriate safety measures during use and storage.
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