Effect of the parameters of the thermal modification of brown coals on their sorption properties

Abstract

The effect of carbonization and activation conditions on the adsorptive and mechanical properties of sorbents obtained from brown coal was studied. It was found that the heat treatment of brown coal before carbonization with an increase in the temperature from 230 to 400°C makes it possible to increase the volume of macropores by 30–40%; however, it does not lead to a change in the microporous structure of activated carbon. The porous structure of carbon sorbents depends on the degree of combustion losses and the temperature of activation. A change in the activation temperature of the carbonized intermediate product from 700 to 900°C makes it possible to regulate the sorption properties of the resulting activated carbons.