Abstract
Chemical structure of char plays an essential role in coal gasification reactivity, especially functional groups and active site. In this study, reactivity difference was discussed by integrating functional groups, mineral interactions with active site. A thermogravimetric analyzer was applied to determine the active site by adsorption and desorption process. X-ray photoelectron spectroscopy (XPS) results prove that coal char loaded Ca (Ca + Dem-char) and the char containing Ca, Si and Al (Ca+(Si, Al)-char) have fewer ratio of ether (COC)and carbonyl (CO) groups because Ca species facilitate the decomposition of these groups in pyrolysis. Active site analysis illustrates that compared with demineralized char (Dem-char), char with Si and Al ((Si, Al)-char) has the smallest amount of active site, which is the direct factor for an inferior gasification reactivity, because Si and Al not only have no function to adsorb gasifying agent but also block some active site and even make some carbon become inert.
Published Version
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