Novel co-pyrolysis of biomass & plastic to produce green fuel

A scientific study has highlighted the potential of co-pyrolysing biomass and polypropylene plastic to produce high-quality pyrolysis oil, offering a promising pathway for sustainable fuel production and improved waste management. Conducted by researchers Zhou, Hu and Xu, the study uses advanced ReaxFF molecular dynamics simulations to examine the chemical behaviour and properties of pyrolysis oil generated from mixed feedstocks.

Pyrolysis is a thermochemical process that decomposes organic materials at high temperatures in the absence of oxygen. While biomass pyrolysis has long been explored as a renewable energy solution, the co-processing of biomass with polypropylene—a widely used plastic—introduces a dual benefit: converting renewable organic matter and plastic waste into valuable energy products.

The study finds that pyrolysis oil derived from co-pyrolysis exhibits distinct characteristics compared to oil produced from biomass or plastic alone. As per reports, variations were observed in chemical composition, calorific value and thermal stability, driven by complex molecular interactions between the two feedstocks. These properties are critical in determining the oil’s suitability as a biofuel or chemical feedstock.

Using molecular-level simulations, the researchers were able to track real-time chemical reactions during pyrolysis, providing deeper insights into how hydrocarbons form and evolve under different conditions. The study also demonstrates that altering the biomass-to-plastic ratio can influence key oil properties such as viscosity and density, allowing greater control over fuel quality.

Temperature and heating rate were found to play a significant role in shaping oil composition, with specific conditions favouring the formation of valuable hydrocarbons used in fuels and industrial chemicals. The research further notes that effective management of ash content can improve process efficiency and product yield.

Overall, the findings support co-pyrolysis as a robust and flexible approach to addressing plastic pollution and biomass waste simultaneously. By transforming these materials into usable energy, the technology aligns with circular economy principles and global efforts to reduce reliance on fossil fuels.