The effect of oxygen pressure and carbon burn-off on the product ratio of the carbon-oxygen reaction

✍ Scribed by Roger Phillips; F.J. Vastola; P.L. Walker Jr.

• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 622 KB
• Volume: 7
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(69)90079-7

✦ Synopsis

The reaction of Graphon with O2 has been studied at 625°C in a static system, using initial O2 pressures between 25 and 750 mTorr. and samples pre-oxidized to varying degrees of burn-off between 0 and 20 per cent. The reaction temperature was low enough for secondary reactions to be neglected. A mass spectrometer was used to monitor the partial pressures of 02, CO and COZ. During a reaction, after a brief induction period corresponding to the formation of stable complex on the carbon surface, the incremental product ratio CO/COZ became constant. This product ratio increased with initial carbon burn-off and decreased with initial 0, pressure. Stable complex formation increased with initial carbon burn-off and initial oxygen pressure. It is suggested that for a particular burn-off the product ratio is a function of both the amount of stable complex on the surface and the relative extent to which CO and CO,-generating sites are deactivated by stable complex formation.