Abstract
Abstract The wet oxidation of three kinds of heattreated graphitizing carbons, petroleum coke, anthracite and coal coke, in a solution of potassium dichromate in phosphoric acid has been studied in order to clarify the relationship between the chemical reactivity and the carbon structure. Changes in the interlayer spacing and crystallite size, which are used as a measure of graphitization, have been examined by X-ray diffraction method for each specimen over the range of heat treatment temperatures from 1100 to 2800°C. The oxidation velocity increases with the degree of graphitization. The quantity of carbon dioxide evolved, V, is generally expressed by the following equation, V=atb. The b-value depends on only the degree of graphitization and varies from 0.8 to 1.5 according to the increase of graphitization, but it does not depend on the oxidation temperatures.
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