# Contaminant-Tolerant Conversion of Polyethylene Waste to α‑Olefins

## TL;DR

A new method converts contaminated polyethylene waste into valuable α-olefins without needing catalysts.

## Contribution

A catalyst-free process called TGT is shown to produce high-value α-olefins from contaminated plastic waste.

## Key findings

- TGT produces oil rich in α-olefins from complex waste streams.
- Additives and contaminants are removed in the process, leaving pure olefins.

## Abstract

Polyethylene (PE) is the most widely used polymer in
the world.
Existing advanced recycling methods are energy-intensive and produce
complex products that require further separation and purification.
In catalytic chemical upcycling, catalysts are often susceptible to
poisoning due to the presence of additives and contaminants in waste
streams. Herein, we demonstrate that temperature gradient thermolysis
(TGT), a catalyst-free process, can tolerate complex waste streams
containing various fillers, additives, and other contaminants. Via
TGT, real-life PE waste from complex waste streams selectively produces
high-value oil rich in olefins, and ∼90% of these olefins are
α-olefins. Additives, fillers, dirt, and biological residues,
commonly seen in plastic waste, are absent in the olefin-rich oil.
This work highlights the remarkable potential of TGT as a robust approach
to produce high-quality α-olefins for subsequent upcycling into
high-value chemicals and materials, advancing sustainability.