TiCl4 is Ziegler- Natta catalyst

Well, one would be the Ziegler-Natta catalyst that's used to make polypropylene.

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Well known by the Ziegler-Natta catalysts. (Nobel prize 1963)

Metals: Al(C2H5)3 and complexes of Ti, Zr or Hf

Traditionally Ziegler-Natta catalyst (TiCl3 or TiCl4 along with aluminium based co-catalyst) was used for olefin polymerization.

But in recent years a variety of other complexes containing metals like aluminium, nickel, zirconium, ruthenium, iron, cobalt, hafnium, yttrium, titanium, vanadium, etc have also been employed as catalysts for olefin polymerization.