Abstract
1. Adsorption isotherms have been determined and compared for the vapors of water, methanol, and benzene on a number of carbon blacks which had been subjected to different thermal treatments. With increasing treatment temperature, there were decreases in both the amount of surface oxygen, capable of exchange reaction with aqueous NaOH, and in surface roughness of the blacks. The surface of the blacks became much more uniform after treatment in a hydrogen stream at 1700°. 2. Adsorption of water vapor fell rapidly with increasing graphitization, mainly as the result of removal of surface oxides. With blacks graphitized in a hydrogen stream at 1700°, water vapor adsorption was very small, even in the region of high pressure ratios. 3. Adsorption of methanol vapor on graphitized blacks dropped markedly in the region of low pressure ratios, as the result of destruction of surface oxides. In this case, decrease in surface roughness played a secondary role. 4. Adsorption of benzene vapor on graphitized blacks decreased, with decreasing surface roughness and surface coverage with chemical compounds, in the region of low surface coverage. 5. The surface properties of blacks of different origin were very similar after graphitization in a hydrogen stream at 1700δ.
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