Abstract
The alkali-catalyzed oxidation of humic coals of different metamorphic ranks with molecular oxygen at 75°C was studied. As a result of analysis of the rate curves, an equation was derived to describe the oxygen uptake as a function of time. It was found that the initial reaction rate depends on the class and grade of coal. It was shown that the amount of carboxyl groups in oxidized sample increased by a factor of 9. On the basis of the experimental data and the summarized results of investigation of organic substances of various structures in highly basic media, it was concluded that low-rank coals could be oxidized at quite a high rate due to the presence of highly acidic C-H groups in them, yielding humic acids as the main oxidation products.
Published Version
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