High purity ammonium metatungstate is a water soluble crystalline powder with white or yellowish appearance. It is an important intermediate compound in the tungsten wet smelting process. Also, it is one of tungsten catalysts. The active component of ammonium metatungstate (AMT) catalyst is tungsten trioxide (WO3), which is used as a catalyst carrier. With the vigorous development of the petroleum processing industry, the research, development and application of high purity ammonium metatungstate have also been directly promoted.
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There are many preparation processes for high purity ammonium metatungstate, such as ion exchange, neutralization, thermal degradation, liquid-liquid extraction, electrodialysis and acidolysis. However, these methods have certain limitations. Therefore, the researchers proposed a new preparation method - neutralization nanofiltration coupling process, that is, acid neutralization to prepare AMT mixed solution; Nanofiltration of AMT mixed solution.
You know, there are many other tungsten catalysts, such as WS2 (tungsten disulfide), WO3 (tungsten trioxide), tungstic acid, WO3 composites, etc.
