Changes of pore structure and reactivity during CO₂ and H₂O gasification of fir char

The fir char gasification with CO₂ and H₂O were investigated with a fixed-bed apparatus, and the pore structure characteristics and the CO₂ gasification reactivity of the partially gasified char were examined. The results of pore structure analysis indicate that during gasification the pore properties are affected by gasification agent, which means that during CO₂ gasification mainly micropores are produced and the pore diameter is mainly in the range of 0.4nm~0.9nm, while during H₂O gasification the micropores are produced at the beginning and then the mesopores are developed. The correlation between CO₂ gasification reactivity and BET surface area shows that the char reactivity is affected not only by BET surface area but also by pore properties.