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Hydrogen and Carbon Nanotubes from Pyrolysis-Catalysis of Waste Plastics: A Review
Summary
This review examines how pyrolysis of waste plastics coupled with steam reforming or catalytic processes can produce hydrogen gas and high-quality carbon nanotubes, covering different reactor designs and catalyst types. The work highlights waste plastics as a potentially valuable feedstock for generating both clean energy and advanced carbon materials.
Abstract More than 27 million tonnes of waste plastics are generated in Europe each year representing a considerable potential resource. There has been extensive research into the production of liquid fuels and aromatic chemicals from pyrolysis-catalysis of waste plastics. However, there is less work on the production of hydrogen from waste plastics via pyrolysis coupled with catalytic steam reforming. In this paper, the different reactor designs used for hydrogen production from waste plastics are considered and the influence of different catalysts and process parameters on the yield of hydrogen from different types of waste plastics are reviewed. Waste plastics have also been investigated as a source of hydrocarbons for the generation of carbon nanotubes via the chemical vapour deposition route. The influences on the yield and quality of carbon nanotubes derived from waste plastics are reviewed in relation to the reactor designs used for production, catalyst type used for carbon nanotube growth and the influence of operational parameters. Graphic Abstract
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