Abstract
Reactions for the production of carbon dioxide when oxygen reacts with carbon are considered. In order to determine which reaction(s) is of primary importance, oxygen-16 and oxygen-18 (in molecular oxygen, carbon monoxide and carbon dioxide) are used. Reactions of the above molecules (always at a total pressure <100 millitorr) with the graphitized carbon black, Graphon, are followed by monitoring continuously reactant and product pressures mass spectrometrically. It is shown that carbon dioxide is a primary product of the carbon-oxygen reaction. The intermediate for carbon dioxide production involves atomic oxygen on the carbon surface, or the reaction can be written 2C + O2 → 2C(O)i → CO2 + C. Possible exchange reactions on the carbon surface, which could lead to misinterpretation of the results, are investigated.
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