Optimization of catalytic pyrolysis of plastic waste into value-added fuels and chemicals using reactive extrusion.

Project Abstract

This study develops and validates a novel catalytic pyrolysis process for converting municipal plastic waste into value-added fuels and chemical feedstocks via reactive extrusion, aiming to enhance product selectivity, energy efficiency, and process throughput while minimizing environmental impact. A multidisciplinary approach combines catalyst engineering, reactor design, and material flow optimization to address the challenges of feedstock heterogeneity and rapid heat transfer limitations associated with conventional pyrolysis. The research integrates catalyst formulation using zeolitic and mesoporous materials with acid-base and redox properties tailored to promote selective scission of polymer chains and preferential formation of aliphatic fuels, aromatics, and light oxygenates. Reactive extrusion is employed to achieve intimate contact between catalyst and plastic feed, in-situ heat and mass transfer facilitation, and continuous operation under controlled residence times, enabling scalable, continuous-flow processing. Thermochemical characterization of as-received plastic waste outlines composition, contaminant profiles, and proximate/ultimate analyses to inform feed pre-treatment strategies, including sorting, washing, and size reduction. A comprehensive kinetic model is developed to describe polymer cracking, secondary reactions, and catalyst deactivation, incorporating feedback from real-time analytics. Process optimization employs statistical design of experiments (DOE) and response surface methodology (RSM) to identify optimal temperature windows, residence times, catalyst loading, and extrusion parameters that maximize yield of C1–C12 fuels, middle distillates, and valuable chemical intermediates while suppressing char formation and inhibitor species. Advanced analytical techniques, including GC-MS, GC-FID, FTIR, and NMR, are used to quantify product distributions, identify key reaction pathways, and monitor sulfur and chlorine-containing contaminants to ensure compliance with environmental regulations. Environmental life cycle assessment (LCA) and techno-economic analysis (TEA) are integrated to compare the proposed process against conventional waste management routes, emphasizing cradle-to-gate energy balance, greenhouse gas emissions, and capital and operating costs. A pilot-scale demonstration evaluates long-term catalyst stability, extrusion longevity, and process robustness under continuous operation, addressing potential fouling, deactivation, and regeneration strategies. The expected outcomes include a tunable process that can shift product selectivity toward higher-value fuels or chemical feedstocks by adjusting catalyst composition and extrusion conditions, as well as a scalable design framework for integration into existing plastics recycling infrastructure. Sensitivity analyses reveal critical parameters influencing reactor performance and economic viability, while optimization results provide actionable guidelines for reactor engineering, catalyst lifetime extension, and post-processing requirements. Ultimately, the research aims to contribute a sustainable, economically viable pathway for transforming plastic waste streams into market-competitive energy and chemical products, reducing reliance on virgin fossil resources and mitigating environmental burdens associated with plastic disposal.

Project Overview

What This Project Is About

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A practical study on turning plastic waste into useful fuels and chemicals by using a catalytic process that speeds up reactions, combined with reactive extrusion, a method that blends materials while they react. The project explores how catalysts and extrusion conditions influence product quality and yield.

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The Problem It Addresses

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Plastic waste rises faster than disposal methods can handle, causing environmental and health concerns. Conventional recycling often produces low-value products. This project investigates a more efficient way to convert plastics into valuable fuels and chemicals, reducing waste and adding economic value.

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Objectives of the Project

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1. Understand how catalysts affect plastic break-down during pyrolysis.
2. Evaluate the role of reactive extrusion in improving mixing and reaction rates.
3. Identify the best catalyst and extrusion conditions for higher-value outputs.
4. Characterize the fuels and chemicals produced for quality and suitability.
5. Assess environmental and technical feasibility of the process at lab scale.

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What You Will Do Step by Step

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1. Review basic literature on catalytic pyrolysis and reactive extrusion.

2. Set up a lab-scale reactor with catalysts and extrusion equipment.

3. Run controlled experiments varying catalyst type, temperature, and extrusion speed.

4. Collect vapors and liquids for analysis using simple characterization methods.

5. Analyze data to find trends in yields and product quality.

6. Compare results to baseline non-catalytic processes.

7. Discuss practical implications and potential improvements.

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Expected Outcome

Expected to identify a catalyst-extrusion setup that increases the yield of valuable fuels and specialty chemicals from plastics, with clearer process parameters and a sense of environmental benefit.