Ammonium tungstate is an inorganic compound with the chemical formula (NH4)10(H2W12O42)•4H2O. It is a typical tungstate containing dodecavalent tungsten. Ammonium tungstate is a light yellow crystal, soluble in water and easily affected by moisture. Ammonium tungstate is widely used in chemistry and industry, especially as a tungsten supplement and catalyst. In the field of catalysis, ammonium tungstate can be used in liquid phase oxidation reactions, such as oxidation of fatty acids, esters and aldehydes. In addition, ammonium tungstate can also be used in organic synthesis, such as copper oxide catalyzed reaction of alkenes. It can also be used to prepare catalyst supports and photosensitive materials, etc.
There are two main preparation methods of ammonium tungstate: one is prepared by the reaction of sodium tungstate and ammonium salt; the other is prepared by the reaction of ammonium sulfate and tungstic acid. Wherein, the latter is a common method, and the reaction equation is as follows:
H2WO4 + (NH4)2SO4 → (NH4)10(H2W12O42) 4H2O
During the preparation process, some additives can be added to improve the purity and morphology of ammonium tungstate. For example, solvents such as ethanol, ether, and acetone, or surfactants such as resin and silica gel can be added.
When using ammonium tungstate, keep it dry and avoid contact with other substances. Ammonium tungstate has a certain degree of toxicity, and should avoid contact with skin and inhalation of its dust. In case of contact, it should be cleaned in time and seek medical treatment.
In conclusion, ammonium tungstate is an important inorganic compound with broad application prospects. With the continuous development of science and technology, it is believed that ammonium tungstate will still play an increasingly important role in the future.
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