Effects of the crystallinity of lignocellulosic material on the porosity of phosphoric acid-activated carbon

摘要

Activated carbons were prepared from three different lignocellulosic materials or in various lengths of impregnation time by phosphoric acid activation. The porous texture of activated carbon was analyzed in terms of the adsorption isotherm of nitrogen, and the crys tallinity of lignocellulosic material was measured by X-ray diffraction method. The resu showed that decreasing the crystallinity of lignocellulosic material promotes pore develop ment, especially of mesopores. However, excessive impregnation is detrimental to activa tion. Impregnation and the selection of parent lignocellulosic material have a similai effect on developing porosity during phosphoric acid activation.