Regeneration of nickel catalyst on carbon
- Tohoku Univ., Sendai (Japan)
Catalytic activity of nickel for carbon gasification is initially high at 500-700[degrees]C, but it disappears when the reaction is repeated or the specimen is preheated in an inert atmosphere above 700[degrees]C. The deactivated catalyst was found to be regenerated by a treatment with steam at 700-800[degrees]C and subsequent reduction at 350[degrees]C. The surface state of nickel on carbon was inferred by temperature-programmed desorption of hydrogen, and a correlation was found between the TPD patterns and the catalytic activity for gasification. Catalytic activity of the nickel for CO[sub 2] conversion in 1%CO[sub 2]+99%H[sub 2] mixture deactivated, and the catalyst was regenerated in a similar way as that observed for gasification. Redispersion of nickel and, possibly, removal of contaminants are thought to be responsible for the observed catalyst regeneration. 17 refs., 4 figs.
- OSTI ID:
- 6131035
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:1; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CARBON
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CONVERSION
DESORPTION
ELEMENTS
GASIFICATION
HYDROGEN
INERT ATMOSPHERE
METALS
NICKEL
NONMETALS
REDUCTION
REGENERATION
SORPTION
STEAM
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS