The characteristics of coal char gasification at around ash melting temperature

The high-temperature CO 2 gasification (1173-1773 K) of coal char was investigated by using TGA and SEM and by measuring inner surface area concerning four different coals having much different ash melting temperatures. In regard to the unreacted char, the surface areas of micropores (diameter 0.1 μm) surface area did not. The true gasification rate constant was evaluated based on effectiveness factor prediction. The activation energy thus determined was 399 kJ.mol −1 which is 1.88 times as large as the apparent activation energy value obtained without the correction of effectiveness factor