Coke deposition from acetylene, butadiene and benzene decompositions at 500–900°C on solid surfaces

• Published in: Carbon (New York) 1982, Vol.20 (4), p.319-330
• Main Authors: Graff, Michael J., Albright, Lyle F.
• Format: Article
• Language: English
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/0008-6223(82)90008-2

Coke formation from decomposition of acetylene, butadiene, and benzene and decoking were investigated on Incoloy 800, aluminized Incoloy 800, and Vycor glass surfaces at 500–900°C. On Incoloy 800, the coke was greater in quantity and contained iron and nickel particles. On aluminized Incoloy 800, the coke contained a trace of aluminum, but on Vycor glass, no metal was in the coke. Coking-decoking sequences were highly corrosive on Incoloy 800 surfaces, but they had much less effect on the aluminized Incoloy 800 or Vycor glass. Filamenteous coke which is formed catalytically and contains nickel and iron was formed only on Incoloy 800 surfaces. A general mechanism for formation and deposition of coke is proposed. Filamenteous coke helps collect tar droplets formed by gas-phase reactions. Such droplets decompose on the surface to produce coke that contains no metal.