Effect of high-temperature coke deposition from methane upon the structure of manganese-yttrium oxides

✍ Scribed by I.A. Ikonnikov; V.E. Rudnik; A.Yu. Loginov

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 741 KB
• Volume: 35
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(96)00171-6

✦ Synopsis

Interaction of manganese-yttrium

oxides with methane at 970 K can be viewed as proceeding in two consecutive steps: initial reduction of the system followed by formation of carbonaceous deposits due to CH, decomposition.

It was shown by SEM that methane degradation on Mn/Y,O, systems resulted in vermicular and funnel-shaped carbonaceous deposits, as well as layered carbon, Upon carbonization, a substantial modification of oxide surface was observed by XRD and TEM; this included phase segregation and surface destruction with oxide species being torn off by growing carbonaceous deposits.