Deactivation and subsequent regeneration of silica-supported nickel catalysts during methane cracking
Conference
·
OSTI ID:370955
- Univ. of South Carolina, Columbia, SC (United States)
Carbon filaments are often formed during hydrocarbon cracking over supported nickel, iron and cobalt catalysts. In this investigation, methane cracking was studied over silica-supported nickel catalysts. These catalysts were found to be highly active for stoichiometrically cracking methane into hydrogen and carbon. SEM and TEM characterization of the spent catalysts indicated that carbon deposits as hollow cylindrical filaments which grow in length with increasing time-on-stream. A nickel particle was observed on the tip of each carbon filament. Thus, deactivation due to carbon deposition does not occur until carbon filaments begin to interfere with each other due to the limitations of the pore structure of the catalyst. To produce additional hydrogen as well as to restore the activity of the catalyst, the spent catalyst was then subjected to a steam regenerations step. At the end, the deposited carbon was removed, the nickel particles fell back onto the silica support and the activity of the catalyst was fully recovered.
- OSTI ID:
- 370955
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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