ACTIVATION OF ANTHRACITE - USING CARBON-DIOXIDE VERSUS AIR

Devolatilized (950-degrees-C) anthracite was activated in 0.1 MPa CO2 at 950-degrees-C and 0.1 MPa air at 425-degrees-C and 450-degrees-C. A t comparable gasification rates and carbon burn-offs in CO2 and air, l arger surface areas and pore volumes were developed by activation in C O2. This is attributed foremost to less uniform activation through the anthracite particles when gasification takes place in air. Also, the formation of a stable oxygen complex, concurrent with carbon gasificat ion in air, may reduce the efficiency of anthracite activation.