The performance of coke in blast furnace (BF) used to prefer a high strength and low reactivity, generally, while the high reactivity coke commonly has a low strength. To overcome the contradiction, it is important to develop a catalyst to increase the reactivity of carbon, so that the reaction mode can be changed from chemical reaction control to diffusion control. In this study, the reaction behavior of a ferro-coke was investigated, in which an iron oxide were added into a raw coal. Using high temperature laser microscope, in situ observation was carried out with the ferro-coke sample ground into tetragonal shape with 3.4×3.4×2.2 mm. Behavior of catalyst in coke was clarified through the in situ observations. It was found that the temperature at peak of reaction without catalyst was 1270°C, while the coke with catalyst showed two peaks at 900°C and 1270°C. It was considered that redox reactions would exist in the system. The mechanism of redox reaction is shown as Eqs. (1), (2) and (3), mainly.
