Ammonium metatungstate (H28N6O41W12, Ammonium Metatungstate, abbreviated as “AMT”) is a tungsten compound composed of four chemical elements: tungsten, nitrogen, hydrogen, and oxygen. It is a white crystalline powder, which is an important raw material for the production of tungsten oxide (WO3-X). However, there are some differences between the two in terms of physicochemical properties and production methods.
Physical and chemical properties of ammonium metatungstate
Ammonium metatungstate has the appearance of white crystal or yellowish powder, the purity is up to 99.95%, the melting point is above 300℃, the relative density is 2.3g/cm³, it can be dissolved in water, insoluble in ethanol, and it is stable under normal temperature and pressure, but it is easy to be decomposed into WO3 by heating, it is worthwhile to say that, under the same condition, the solubility of AMT is larger than that of APT, which is the most obvious difference between the two. This is the most obvious difference between the two; AMT has a certain degree of irritation and toxicity, so special attention should be paid to the production and use of AMT to prevent it from contacting with eyes and skin.
Ammonium metatungstate production method
Ammonium metatungstate can be manufactured by thermal degradation method, liquid-liquid extraction method, ion exchange method, electrodialysis method, neutralization method, acidolysis alcoholysis method and other processes. Among them, thermal degradation method refers to the process of firstly decomposing APT by heating and then evaporating and crystallizing to get AMT; neutralization method refers to the process of reacting APT with organic acid (such as formic acid) or inorganic acid (such as nitric acid) to get AMT.
Ammonium metatungstate use
Ammonium metatungstate can not only be used to manufacture tungsten compounds such as tungsten oxide and ammonium phosphotungstate, but also can be used as catalysts for petrochemicals and colorants for ceramics. Among them, the petroleum catalyst containing AMT is a product with hydrochloric acid vapor-treated activated white clay as the carrier and ammonium metatungstate heteropolyacid as the active component, which has high catalytic activity, good selectivity, excellent water solubility and long service life.
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