POROUS TEXTURE OF ACTIVATED CARBONS MODIFIED WITH CARBOHYDRATES

A modification of the porous texture of activated carbons to develop m eso- and macroporosity is described. Three gas-activated carbons of di fferent origin, have been modified by impregnation with two carbon com pounds (D-glucose and D-glucosamine) from aqueous solution followed by carbonization at 1173 K and activation with CO2. The most important r esults of this procedure are (1) the development of meso- and macropor osity depends on the mesopore size distribution of the original activa ted carbon; (2) the gasification rates are different for each impregna ted carbon in the activation step, and (3) there was no or little deve lopment of the original microporosity. (C) 1997 Elsevier Science Ltd.