Given the large amount of green coconut husk (GCH) waste generated in Brazil and the environmental impacts of improper disposal, this study evaluated pyrolysis as a method for managing and adding value to residual GCH biomass by producing value-added products. GCH exhibited properties suitable for pyrolysis, including high volatile content, low ash content, and a higher heating value (HHV) of approximately 22 MJ kg–1. Pyrolysis was carried out in a rotary kiln reactor operated at 400, 500, and 600 °C, yielding biochars (29–47 wt %) and bio-oils (6.6–11 wt %). Increasing the temperature intensified biomass thermal degradation, resulting in higher gas production (up to 31.4 wt %). The 400 °C biochar had a higher yield and greater organic functionalization, making it suitable as an adsorbent; the 600 °C biochar had a more aromatic and stable structure, making it promising for carbon sequestration; and the 500 °C biochar balanced functionalization and stability, broadening its application potential. The bio-oils had calorific values between 26 and 31 MJ kg–1 and moderate viscosity. The highest yield (∼11 wt %) and phenolic monomer content (∼50% by area) were obtained at 500 °C, highlighting the product’s potential for industrial use. The results indicate that pyrolysis at 500 °C is the most favorable condition for the energy and chemical utilization of green coconut biomass, providing a sustainable and viable route for producing value-added bioproducts.
Martins et al. (Tue,) studied this question.