Ammonium metatungstate hydrate (Ammonium Metatungstate Hydrate, Hexaammonium Wolframate Hydrate, CAS No. 12333-11-8), the molecular formula of ammonium metatungstate hydrate is (NH4)6H2W12O40•xH2O. Ammonium metatungstate hydrate is a Keggin type heteropolytungsten compound. It can be prepared by polycondensation of ammonium tungstate solution. It is widely used as a precursor for the preparation of tungsten catalysts for hydrocracking and as a fuel cell catalyst.
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