How to Prepare Tungsten Trichloride?

Tungsten trichloride can be produced by reacting tungsten powder or other tungsten compounds with chlorine gas at high temperature; it can also be obtained by reacting tungsten hexachloride as raw material with bismuth, and tungsten hexachloride is reduced by bismuth to obtain a mixed valence state Chloride of W(III)-W(IV): 9WCl6+ 8Bi→3W3Cl10+8BiCl3

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