Ammonium Metatungstate(AMT)
Introduction
Ammonium metatungstate, also known as AMT, is a tungsten chemical in the form of highly soluble hydrated crystals. AMT produced by Chinatungsten Online to meet stringent demands in the catalyst, medical, semiconductor and other high-technology industries. It is also used in materials research and analytical chemistry. At room temperature, aqueous solutions can be saturated up to 70% by weight of contained WO3. This equates to 1.6 kilograms per liter or 13.3 pounds per gallon.
Physical Property
Chemical Formula: (NH4)6H2W12O40·xH2O
Molecular Weight: 2956.30
EINECS NO.: 234-733-4
CAS NO.: 12028-48-7
Melting Point: 100 °C
Chemical Property
| Grade | AMT-A | |||||||||||
| WO3 Content (≥%min) | 91.0 | |||||||||||
| Impurities (%max) | ||||||||||||
| Element | Al | As | Bi | Ca | Cu | Fe | Mg | K | Mn | Mo | ||
| MAX | 0.0010 | 0.0010 | 0.0001 | 0.0010 | 0.0005 | 0.0020 | 0.0005 | 0.0010 | 0.0010 | 0.0030 | ||
| Element | Na | Ni | P | Pb | S | Sb | Si | Sn | Ti | V | ||
| MAX | 0.0020 | 0.0005 | 0.0007 | 0.0001 | 0.0030 | 0.0005 | 0.0010 | 0.0010 | 0.0010 | 0.0010 | ||
Application
AMT is a source of high-purity, water-soluble tungsten which is essentially free of alkali and other metallic impurities. It is mainly used as a raw material for the production of tungsten
catalysts for a variety of reactions including oxidation, hydroxylation, hydrogenation, and polymerization. Suitable carriers can be impregnated with alkali-free solutions of tungsten and processed to remove the water and ammonia. Such catalysts are used by the petrochemical
industry.
Other applications include: reagents for chemical analysis such as for medical diagnosis; source material for the preparation of high-purity WO3 used as a thin-film substrate for certain semiconductor devices; high-purity source material for research in tungsten chemistry; source material for the DeNOx catalyst industry; as a precursor to a variety of POM (polyoxometalates).
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