Studia Universitatis Babes-Bolyai, Chemia
Commercial beech wood char characterized by low volatile matter (5.3%) and high carbon content (94.5%) was initially used as a potential feedstock to obtain the activated carbon for methane sorption. Microand mesopores volumes were determined to be at the level of 0.21 cm3∙ g-1, while the specific surface area of the material was determined to be at the level of 416 m2∙ g-1. Carbonization carried out at the temperature range of 750-900 oC resulted in slight increase of the pore volume (up to the value of 0.23 cm3∙ g-1) and the specific surface area (up to the value of 480 m2∙ g-1). Upon the steam activation (up to the 50% loss of the organic mass) the specific surface area increased substantially and was within the range of 887-943 m2∙ g-1 together with mico-and mesopores volumes that was within the range of 0.54-0.58 cm3∙ g-1. The maximum methane adsorption was determined for the sample activated at a temperature of 800 oC–17.7 g∙ kg-1 with a process reversibility of 84.2%. Considering the beech wood char price, its availability and well-known methods of its surface structure improvement, the obtained active carbons are interesting for their testing on a larger scale.