Internal carbon deposition resulting from a redistribution of gaseous species under combined diffusion and steam reforming reactions in a catalyst pellet
✍ Scribed by A. Ovenston; J.R. Walls
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 622 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
In steam reforming of hydrocarbons, the diverse relative rates of diffusion of the individual gaseous species within the catalyst can cause a redistribution of the composition with progress of the gas mixture into the pellet.
Consequently, the changes of partial pressure can give rise to conditions favourable to the formation of carbon within the internal pore structure, even though it is not predicted on thermodynamic grounds at the pellet surface.
Using the dusty gas model for diffusion in the transition regime coupled with two steam reforming reactions, this situation is examined for isothermal steady-state operation. By applying thermodynamic tests for carbon prediction within the pellet the conditions promoting an internal fouling problem are outlined.