Carbons formed catalytically by nickel in phenolic resin carbon: Oxidation by Simon's reagent and HNO3-H2SO4
✍ Scribed by A. Ōya; Minoru Takabatake; Sugio Ōtani; Harry Marsh
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 811 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
A graphitic carbon (G carbon) and a turbostratic carbon (Ts carbon) were prepared by the catalytic graphitization of a phenolic resin carbon using bulk and finely dispersed nickel respectively at 1673 K. The nickel was removed at 1673 K using chlorine and the carbons were subjected to heat treatment temperatures (HTT) of 1773, 2273 and 2773 K. For reference, non-graphitizable resin carbons (A carbon) and graphitizable coal-tar pitch carbons (Tp carbon) were prepared at these HTT and examined by X-ray diffraction and Raman i.r. The twelve carbons were oxidized in Simon's reagent and HNOs-HzSO, (51) at 351-393 K. Their surfaces were studied bv SEM. Structural order in the carbons decreases in the order G > Ts> Tp > A. Using Simon's reagent the reactivity order is G > Ts > Tp > A and for mixed acid A>Ts>Tp> G. Activation energies are a maximum for A carbons using Simon's reagent and G carbons using mixed acid. The mechanisms of oxidation in the two media are different. Intercalation may be important in oxidation by Simon's reagent,