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Co-processing plastics waste and biomass by pyrolysis–gasification: a review

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Abstract

Escalating global population and expanding industrialisation have significantly contributed to an increased demand for plastics. Methods for plastic waste disposal predominantly involve landfilling, which consumes space and pollutes soil and water bodies, posing a substantial threat to the environment and public health. The critical challenge herein lies in efficiently managing the abundant biomass and plastics waste. Here we review gasification and pyrolysis, two prominent waste treatment processes. Co-pyrolysis of plastics and biomass exhibits a synergistic effect, significantly enhancing the yield and quality of bio-oil, biochar, and syngas. Integration of gasification and pyrolysis reduces activation energy, increases hydrogen production during co-gasification, and improves bio-oil calorific value. The gasification of polyethylene terephthalate with air in the presence of activated carbon limits tar formation with enhanced syngas production. Steam gasification enhances hydrogen generation by up to 40.0% compared to air gasification. Selective catalysts in the integrated pyrolysis–gasification process of biomass and plastics mixtures demonstrate optimisation of the production of high-purity carbon nanotubes and bio-oil. Application of innovative approaches such as microwaves, steam purging, and catalysts like zeolite or composite catalysts enhance heat transfer mechanism, tar cracking, and devolatilisation.

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Acknowledgements

The authors would like to thank University of Technology Sarawak for financial support under UTS Internal Research Grant (UCTS/RESEARCH/1/2023/04) to perform this project. The authors acknowledge the financial support by the Education University of Hong Kong to perform this project under International Grant (UMT/International Grant/2021/53456). The authors would like to thank Yuan Ze University and Saveetha Institute of Medical and Technical Sciences for the facilities and support provided.

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PNYY was involved in conceptualisation, methodology, investigation, writing, review editing. SYF, YHC, YFT, XC, NLM and WAWM contributed to writing, review, editing. RKL, CS, YWC: and YHT were involved in conceptualisation, methodology, writing, review, editing. SSL contributed to conceptualisation, methodology, writing, review, editing, supervision, funding acquisition.

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Correspondence to Xiangmeng Chen, Rock Keey Liew or Su Shiung Lam.

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Yek, P.N.Y., Chan, Y.H., Foong, S.Y. et al. Co-processing plastics waste and biomass by pyrolysis–gasification: a review. Environ Chem Lett 22, 171–188 (2024). https://doi.org/10.1007/s10311-023-01654-7

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