Reactivity of coal chars to carbon dioxide at high temperatures (1273〜1873K) was measured by using a fluidized bed reactor (FBR). Coal samples were pyrolyzed in nitrogen flow under rapid and slow heating conditions, and then in-situ measurement of gasification rates was carried out. It was found that the heating rate affected the reactivity of coal char significantly, i.e. the more rapid the heating, the higher the reactivity of chars. Especially for coals with high volatile content, the reactivity of coal chars prepared in the rapid heating was several times as large as that in the slow heating. In addition, nitrogen adsorption measurements were carried out. Much larger porosity and surface area of mesopores were found for the rapid heating chars than the slow heating chars.
