Thermal Pyrolysis Kinetics of Plastic Waste Blends

Thermal pyrolysis kinetics of plastic waste blends centres on the rate and mechanism of polymer breakdown under elevated temperatures in the absence of oxygen. As global plastic production exceeds hundreds of millions of tonnes annually, traditional recycling struggles to manage heterogeneous streams comprising polyethylene (PE), polypropylene (PP) and polystyrene (PS). Thermal pyrolysis offers a thermochemical route to convert mixed plastics into liquid fuels, chemical feedstocks and gaseous hydrocarbons. Research efforts focus on quantifying kinetic parameters—such as activation energy and pre-exponential factors—identifying dominant reaction mechanisms and understanding how blend composition and heating rate influence decomposition pathways. Model-fitting and model-free analyses reveal whether first-order, contracting-geometry or higher-order kinetics prevail at different stages of conversion. By elucidating these fundamental kinetics, scientists can optimise reactor design, maximise product yield and improve energy efficiency. This field bridges petrochemical engineering, materials science and environmental chemistry, supporting global circular-economy initiatives and the recovery of value from end-of-life plastics.

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Thermal Pyrolysis Kinetics of Plastic Waste Blends publication trend

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

Technical terms

Thermal pyrolysis: Decomposition of materials at elevated temperatures in an oxygen-free environment.

Activation energy: Minimum energy barrier that reactants must overcome to undergo chemical transformation.

Pre-exponential factor: Frequency term in the Arrhenius equation reflecting collision frequency and orientation.

Isoconversional method: Model-free approach to determine kinetic parameters at constant conversion levels without assuming a reaction model.

Model-fitting method: Kinetic analysis involving selection of a predefined reaction mechanism to fit experimental data.

Synergistic effect: Interaction in a blend where combined behaviour differs from individual components, often enhancing reactivity.

Thermogravimetric analysis (TGA): Technique measuring mass change as a function of temperature to study thermal stability and kinetics.

References

1. Pyrolysis of Mixed Plastic Waste: I. Kinetic Study. Materials (2020).
2. Thermal Behavior of Mixed Plastics at Different Heating Rates: I. Pyrolysis Kinetics. Polymers (2021).
3. Pyrolysis of Mixed Plastic Waste: II. Artificial Neural Networks Prediction and Sensitivity Analysis. Applied Sciences (2021).