The oxidation of dispersed refractory metal compounds and their behavior as carbon oxidation catalysts

✍ Scribed by D.W. McKee

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 652 KB
• Volume: 24
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(86)90234-4

✦ Synopsis

The oxidation behavior of a number of finely dispersed refractory metal borides, carbides, nitrides and silicides has been studied in flowing air at temperatures up to 1000°C. Most of the materials investigated were rapidly converted to oxides under these conditions, but the carbide, nitride and silicide of chromium were more oxidation resistant. Several of these compounds (particularly those of V and MO). were very active catalysts for the oxidation of graphite in this temperature range, but the presence of boron oxide reduced gasification rates in most cases. Compounds of Zr, Si, Al, Ti, Hf and Nb had little or no catalytic activity for graphite oxidation, whereas the borides of Zr, Si, Cr and Al exerted an inhibiting effect.