Pyrolysis Techniques for Plastic Waste Management

Pyrolysis encompasses a suite of thermochemical processes that decompose long‐chain polymeric structures of waste plastics into smaller hydrocarbons, gaseous by-products and solid residues. Conducted in an oxygen-limited environment, this technology offers routes to recover energy and chemical feedstocks while diverting plastics from landfill or incineration. Key variants include thermal pyrolysis, which relies solely on elevated temperatures; catalytic pyrolysis, where solid catalysts modulate reaction pathways to favour specific product slates; fast and flash pyrolysis, distinguished by rapid heating rates and brief vapour residence times to optimise liquid or monomer yields; and steam-assisted pyrolysis, which introduces superheated steam to influence product selectivity and reduce char formation. Reactor configurations span fixed-bed, fluidised-bed and rotary kiln systems, each balancing heat transfer, residence time and scale. Operating parameters—temperature (350–900 °C), heating rate, catalyst choice and feedstock composition—govern the distribution and quality of oil, syngas and char. Products range from liquid fuels and chemical feedstocks to solid carbons, enabling further upgrading, energy recovery or material reuse. Advances in reactor design, catalyst development and process integration are enhancing energy efficiency and economic viability, positioning pyrolysis as a central pillar in the transition to a circular plastic economy.

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Pyrolysis Techniques for Plastic Waste Management publication trend

The graph below shows the total number of articles in pyrolysis techniques for plastic waste management across all publications each year (not limited to Nature Index journals).

Technical terms

Pyrolysis: Thermal decomposition of polymers in the absence of oxygen, yielding liquids (pyrolysis oil), gases and solid char.

Catalytic pyrolysis: Pyrolysis conducted with catalysts that lower activation energies and steer product selectivity towards desired hydrocarbons.

Vapour residence time: Duration that volatile products remain in the reaction zone, influencing secondary cracking and overall yield.

Flash pyrolysis: Process employing very high heating rates and very short residence times to maximise monomer recovery and minimise secondary reactions.

Feedstock: Input material for pyrolysis, typically sorted or mixed streams of waste plastics such as polyethylene, polypropylene and polystyrene.

References

1. A review on feasibility and techno-economic analysis of hydrocarbon liquid fuels production via catalytic pyrolysis of waste plastic materials. Carbon Capture Science & Technology (2025).
2. Pyrolytic Conversion of Plastic Waste to Value-Added Products and Fuels: A Review. Materials (2021).
3. Plastics waste management: A review of pyrolysis technology. Clean Technologies and Recycling (2021).