Answer
The Ziegler–Natta catalyst is a catalyst that is used to polymerize alkenes. It was developed by Karl Ziegler and Giulio Natta in the 1950s and is used to produce a variety of polymers, including polyethylene, polypropylene, and styrene. The catalyst is made of a transition metal, such as titanium, and an organometallic compound, such as triethylaluminum.