The influence of heat treatment on activated carbon structure and porosity

Commercial activated carbon Norit R3-ex was demineralized with concentrated HF and HCl acids and next heated in an Ar atmosphere at various temperatur es (950, 1500, 1800 and 2100 degrees C). For all samples adsorption-desorpt ion isotherms of benzene vapor were determined and X-ray diffraction measur ements were performed. On the basis of adsorption data porous structure cha racteristics were evaluated (by using DA, DS, HK and FR equations) and surf ace areas of meso- and micropores as well as BET surface area were calculat ed. XRD pattern changes in crystallic structure were obtained. On the basis of all, these data influence of thermal treatment of activated carbon on i ts porosity and structure was discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.