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Thermodynamic Analysis of Plastic Waste Conversion to Hydrogen: Heat Integration and System Performance—A Review
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Thermochemical plastic waste conversion to hydrogen via pyrolysis, steam reforming, and gasification achieves 45–60% energy efficiency without heat integration, compared to 65–75% for conventional steam methane reforming, with heat recovery being the critical gap. Converting plastic waste to hydrogen rather than allowing it to fragment into microplastics represents a promising circular economy approach that addresses both energy recovery and upstream plastic pollution prevention.
Thermochemical conversion of plastic waste to hydrogen and synthesis gas represents a potential pathway for energy recovery from heterogeneous waste streams. The feasibility and performance of such systems are fundamentally governed by thermodynamic constraints and heat-management requirements. This review critically examines the thermodynamic and heat-integration aspects of plastic waste conversion to hydrogen and syngas, with emphasis on pyrolysis, steam reforming, gasification, and system-level behaviour. Key thermodynamic features of plastic pyrolysis, reforming, and gasification are discussed, including reaction endothermicity, equilibrium limitations, temperature effects, and product distribution trends. The role of steam reforming and water–gas shift reactions in enhancing hydrogen yield is assessed from equilibrium and energy-demand perspectives. Heat integration emerges as a critical determinant of overall efficiency, with recoverable waste heat present at multiple process stages offering opportunities for internal heat recovery. Energy and exergy analyses identify dominant sources of irreversibility and enable comparison of plastic-derived hydrogen systems with conventional thermochemical hydrogen production routes. Quantitatively, conventional steam methane reforming achieves energy efficiencies of 65–75% and exergy efficiencies of 60–70%, whilst plastic-derived systems without extensive heat integration report 45–60% and 40–55%, respectively. Key challenges include limited thermodynamic property data for real plastic-derived mixtures, insufficient reconciliation of equilibrium and kinetic behaviour, incomplete system-level heat-integration analysis, and scarcity of comprehensive exergy-based evaluations. This review provides a thermodynamic framework for assessing the opportunities and limitations of hydrogen production from plastic waste.
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Plastic waste valorization through pyrolysis and in line sorption enhanced steam reforming with CO2 utilization: Thermodynamic analysis
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Scientists found a way to turn common plastic waste (like the kind used in bottles and packaging) into clean-burning hydrogen fuel and syngas, using heat, steam, and CO2 instead of letting it pile up in landfills or get incinerated. This matters because less plastic waste sitting in the environment or being burned means fewer microplastics and toxic fumes polluting our air, water, and food supply—both of which have been linked to health concerns. While this study is based on theoretical calculations rather than real-world testing, it offers a promising blueprint for recycling plastic into useful, cleaner energy.
Hydrogen from Waste Plastics: Integrated Pyrolysis–Reforming Simulation and Techno-Economic Insights for a Circular Economy
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An integrated pyrolysis-steam reforming process for waste polyethylene, polypropylene, and polystyrene can produce approximately 651 kg of hydrogen per hour with a 39% internal rate of return and under 6-year payback, demonstrating economic viability for plastic-to-energy conversion. This chemical recycling pathway offers a scalable route for diverting plastic waste that would otherwise fragment into environmental microplastics, addressing pollution at the source.
Pyrolysis of Plastic Wastes to Produce Environmentally Friendly Fuel
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Researchers used Aspen Plus process simulation to optimize pyrolysis of mixed plastic waste, finding that fuel production peaks at 460°C and 1 bar while hydrogen production via integrated steam reforming peaks at 700°C, with heat integration substantially cutting external energy demand—though economic viability remained tightly dependent on feedstock throughput.
Hydrogen production from waste plastics: Sustainable processes, recent advances, and emerging trends
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Researchers reviewed thermochemical, catalytic, and emerging electrochemical and photochemical routes for converting waste plastics into hydrogen, assessing each pathway's mechanistic efficiency, catalyst limitations, and techno-economic trade-offs as part of a broader case for plastic valorization within circular economy and clean energy goals.
Plastic Waste Valorization: Prospects for Green Hydrogen Production
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This review assesses the feasibility of producing green hydrogen from plastic waste through pyrolysis and gasification, comparing process efficiency, costs, and carbon emissions across different plastic feedstocks. The authors identify polyolefins as particularly promising feedstocks and outline the technical and economic barriers to scaling these processes.
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