89. Deactivation of finely dispersed nickel during gasification of activated carbon, studied by X-ray photoelectron spectroscopy (XPS)

✍ Scribed by Teus Wigmans; Joeg Van Doom; Jacob A Moulijn

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 131 KB
• Volume: 22
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(84)90306-3

✦ Synopsis

S. A.). Controlled atmosphere electron microscopy examinations have shown that both tungsten and rhenium are active catalysts for the graphite-oxygen reaction, although the former exhibits only marginal activity. Of the two materials, only rhenium is effective in catalyzing the gasification of graphite in hydrogen.

From a comparison of the bicomponent system with that of its pure constituents, it is concluded that in oxygen, rhenium segregates to the surface, whereas in a reducing environment the surface is enriched with tungsten.

Moreover, it was found that the intrinsic catalytic channeling rate of the mixed system is significantly faster than that of tungsten or rhenium in the graphite-oxygen reaction.