Carbon Formation on Unsupported and Supported Nickel Catalysts

✍ Scribed by Figueiredo, José L. ;Trimm, David L.

• Publisher: Blackwell Publishing
• Year: 2010
• Tongue: English
• Weight: 319 KB
• Volume: 28
• Category: Article
• ISSN: 0142-0356
• DOI: 10.1002/jctb.5700280904

✦ Synopsis

Abstract

Studies have been made of the kinetics of carbon deposition on supported nickel catalysts used for steam reforming. Comparison with results obtained with nickel foils show that the support has little effect on the rate of deposition, except that hydrogen did not affect the kinetics of the process on supported catalysts. This is explained in terms of the initial production of nickel crystallites, which are then carried with the growing carbon by a process of diffusion of carbon through the nickel. Calculations show that this diffusion process may well involve the formation of an intermediate carbide.