What is the catalyst used in the Ziegler-Natta polymerization of ethene to produce high-density polyethylene (HDPE)?
Answer and explanation
Correct answer: D.
- Step 1: High-density polyethylene (HDPE) is manufactured at low temperatures () and moderate pressure () using coordination polymerization.
- Step 2: The catalyst discovered by Karl Ziegler and Giulio Natta consists of titanium tetrachloride and triethylaluminium: .
- Step 3: This coordination catalyst produces highly linear, unbranched polymer chains with high density and tensile strength.
Answer
.
Why not the others: with quinoline is Lindlar's catalyst for partial hydrogenation of alkynes to cis-alkenes; with is used in the Haber process; is Adams catalyst for catalytic hydrogenation of carbonyls and alkenes.
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