In the course of study on plasticity of coal, the authors recognized the importance oftransferable hydrogen in coal, however, there has been any accomplished method to quantify thisamount in coal. In the present study the authors compared three methods to elucidate transferablehydrogen in coal such as taking up of this hydrogen by the reaction of coal with condensedaromatics, the reaction of coal by oxygen, and the reaction of coal with sulfur. Six coals such asPittstone-M, Goonyella, Lusca, Workworth, Witbank, and K-prima were employed to examinetheir transferable hydrogen. The authors considered at present the reaction of coal withanthracene is a standard method for estimating transferable hydrogen and taking up of hydrogenwith sulfur seemed not to be appropriate for its quantification. Oxidation reaction of coal byoxygen stream at 140 oC was found to take up active hydrogen in coal to produce carbonyl groupand carboxylic group so that this oxidation seems to be a potential method one evaluating oftransferable hydrogen in coal.
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