Hydrogasification of coal was conducted using a batch type reactor which has a constant volume and was designed for evaluating the effect of hydrogen/coal ratio on hydrogasification reaction at around 800℃. In this work, surface of resulting char was observed by atomic force microscpope (AFM) at the scale of micrometer. AFM images of coal was shown to be relatively smooth. In the images of hydrogaisification chars, however, an ordered texture and agglomeration of nanosphere were observed. From the roughness parameter, deposited surface is not considered to be from pure carbon, but might come from organic volatile matter produced during the hydrogasification reaction.
