A bituminous coal from Illinois (Colchester No. 2) in acid slurry was electrolyzed anodically at 1.2–1.3 V versus SCE (saturated calomel electrode) and 65–75°C. Hydrogen gas was observed to evolve at the cathode with almost 100 percent Faradaic current efficiencies, while simultaneous desulfurization of coal was noted in the anode compartment. In order to enhance sulfur removal, the cations of Ce (IV) and Fe (III) were added to coal slurries. Up to 80 percent reduction in sulfur content of the coal was observed.

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