Effect of the pretreatment on the porosity of the hybrid activated carbons prepared from wood-based solid and liquid precursors

The purpose of this work is to study the relationship between carbonization temperatures (400 and 500 °C) of biomass-based precursors and porosity of the obtained activated carbons. This study is carried out within the framework of the concept of waste-free production using lignocellulosic residue (tar) from levoglucosan obtained by fast pyrolysis of wood. This rich in lignin derivatives tar was used as such and as a mixture with birch wood for the synthesis of activated carbons using thermochemical activations with NaOH at 700 and 800 °C. The obtained porous carbon materials with developed porosity have a specific surface area above 2400 m² g⁻¹. It has been shown that all precursors carbonized at 400 °C and activated at 800 °C are highly porous carbon materials with a total pore volume of 1.5–2.1 cm³ g⁻¹ and mesopores ranging from 2 to 4.4 nm, constituting up to 45–56% of the total pore volume. The obtained samples can be promising materials for use in electrochemical processes to ensure the ion transfer.