Catalytic steam gasification of graphite: Effects of calcium, strontium, and barium with and without sulfur

✍ Scribed by K. Otto; L. Bartosiewicz; M. Shelef

• Book ID: 102996054
• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 904 KB
• Volume: 17
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(79)90008-3

✦ Synopsis

Alkaline earths strongly catalyze steam gasification of graphite. The catalytic effect increases in the order Ca < Sr c Ba. Reaction rates of graphite impregaated with 0.3 at.% Ba are 500 times larger than those of pore graphite. Catalysis is doe to the ~~cipation of addition reaction sites, not to a lowering of the tree activation energy. It follows from kinetic data, electron microscopic observations, and theoretical considerations that the efficiency of the catalysts is closely related to their ability to coat a carbon surface and to continue contact with carbon atoms emerixina from the bulk. In the uresence of sulfur, severe, but not complete, catalyst deactivation occurs. This poison&g-is to a large degree revkrsible.