Catalytic Pyrolysis of Waste Plastics for Energy Recovery

Catalytic pyrolysis has emerged as a versatile process for transforming mixed plastic waste into fuels and chemical feedstocks under an inert atmosphere at elevated temperatures. By coupling thermal depolymerisation with solid acid or metal‐promoted catalysts, long‐chain polymers such as polyethylene and polypropylene are cracked into smaller hydrocarbons, yielding liquid oils in the gasoline and diesel range, light olefin gases and a solid char residue. The incorporation of structured catalysts—especially hierarchical and mesoporous zeolites—enhances access to acid sites, optimises product selectivity and suppresses coke formation, thereby extending catalyst lifetime. Process variables including temperature profile, residence time, plastic‐to‐catalyst ratio and reactor design exert a strong influence on the distribution of aliphatic, aromatic and gaseous products. Beyond resource recovery, catalytic pyrolysis contributes to circular economy goals by diverting waste from landfill, reducing greenhouse‐gas emissions associated with virgin fossil fuels and enabling integration into biorefinery schemes. Recent pilot-scale demonstrations have illustrated continuous reactor concepts capable of self-sustaining energy balances through combustible gas by-products. As catalyst development advances alongside reactor engineering, the technology is moving closer to commercial reality, offering a pragmatic route to sustainable energy recovery and chemical production from ubiquitous plastic waste streams.

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Catalytic Pyrolysis of Waste Plastics for Energy Recovery publication trend

The graph below shows the total number of articles in catalytic pyrolysis of waste plastics for energy recovery across all publications each year (not limited to Nature Index journals).

Technical terms

Pyrolysis: Thermal decomposition of organic materials in the absence of oxygen.

Catalyst: A substance that accelerates chemical reactions without being consumed.

Zeolite: Crystalline aluminosilicate with well-defined pore structures serving as acid catalysts.

Mesopore: Pore with diameter between 2 nm and 50 nm, facilitating diffusion of large molecules.

Cracking: Breaking of long polymer chains into smaller hydrocarbon fragments.

Coking: Deposition of carbonaceous residues on catalyst surfaces, leading to deactivation.

References

1. Catalytic Pyrolysis of Plastic Waste: Moving Toward Pyrolysis Based Biorefineries. Frontiers in Energy Research (2019).
2. Hierarchical zeolites TNU-9 and IM-5 as the catalysts for cracking processes. Applied Catalysis B Environment and Energy (2023).
3. Recent Progress in Low-Cost Catalysts for Pyrolysis of Plastic Waste to Fuels. Catalysts (2021).
4. Conversion of plastic waste into fuel oil using zeolite catalysts in a bench-scale pyrolysis reactor. RSC Advances (2022).