Hydrogenation of carbons catalyzed by nickel, platinum and rhodium

✍ Scribed by A. Tomita; N. Sato; Y. Tamai

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 621 KB
• Volume: 12
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(74)90020-7

✦ Synopsis

Catalytic hydrogenation of a carbon was investigated at a constant temperature. The reaction occurred in two stages as observed therlno~ravimetrically.

For a nickel-catalyzed reaction at 540°C about a half of active carbon was rapidly gasified to methane and the remaining carbon was gasified at a very slow rate. The activation energy for the latter reaction was estimated as 25 kcal/mole. When the carbon was partially oxidized to increase the concentration of surface functional groups, the methane formation in the first stage decreased. An X-ray study showed the formation of crystalline carbon during the course of the reaction. The presence of two stages is attributed to the presence of two components with different reactivities in carbon. The carbon gasified in the first stage may be an amorphous one, and a more crystalline fraction remains without reacting until the temperature is raised up to the reaction temperature for the second stage.