Iridium (Ir)

Iridium is used as a component in alloys with the other platinum group metals, in particular with platinum itself. It makes alloys stronger and imparts greater corrosion resistance. Iridium plays a part as co-catalyst to platinum for petrochemical reforming. Besides, supported catalysts based on iridium are sporadically applied to hydrogenations. A specific application of iridium catalysts is the decomposition of hydrazine (N2H4) into the gaseous elements nitrogen and hydrogen to control satellites.

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Compound CAS Number Formula Metal ­Cont. ­approx. Color
Iridium(III) chloride solution 10025-83-9 IrCl3 up to 10 % dark brown
Iridium(IV) chloride hydrate 10025-97-5 IrCl4 · n H2O 53 % black
Iridium(III) chloride hydrate 10025-83-9 IrCl3 62 - 66% green