Abstract
The hydrogen exchange reactions of Argonne Premium coals and Wandoan coal with tritiated gaseous hydrogen and tritiated water were carried out to investigate the effect of the particle size of coal on the hydrogen exchange reaction. Coals with several particle sizes (< 100 mesh and <20 mesh for Argonne Premium coals, <250 mesh, 250-150 mesh, and 20-22 mesh for Wandoan coal) were used, and it was found that the particle size of coal only slightly affected the hydrogen exchange ratio of coal in both cases of tritiated gaseous hydrogen and water. These results suggest that most of hydrogen exchanged with gaseous hydrogen or water, e.g., hydrogen in functional groups, is located on not only the exterior surface but also interior surface of coal, where hydrogen atom generated in the presence of the catalyst or proton generated from water can easily approach, even in the case of larger particle size of coal.
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