Role of carbon in methanation by cobalt and ruthenium
The surface of cobalt was covered by carbon (/sup 13/C) to a high extent by disproportionation with carbon monoxide (/sup 13/CO) and brought into contact with /sup 12/CO/hydrogen = 1/5 afterwards. The production of various products was followed mass spectrometrically. At 250/sup 0/C both methane (/sup 13/CH/sub 4/) and (/sup 12/CH/sub 4/), as well as carbon dioxide, were formed at comparable rates. At the beginning of the reaction, formation of /sup 13/CH/sub 4/ was slightly faster than that of /sup 12/CH/sub 4/. Analagous experiments with ruthenium at 300/sup 0/C showed that the /sup 12/CH/sub 4/ production was even faster than that of /sup 13/CH/sub 4/. The /sup 12/CO/sub 2/ production was again of a comparable rate with that of the /sup 12/CH/sub 4/ production. No water was detected in the initial stages of these reactions--indicating a relationship between methanation and disproportionation. These results were compared with those of previous experiments using nickel. Carbon /sup 13/C undergoes deactivation which is more important on ruthenium than on nickel (Ru > Co > Ni). On the other hand, the supply of fresh /sup 12/C by disproportionation of /sup 12/CO is more important on ruthenium than on nickel. These two factors lead to a varying extent of incorporation of the predeposited /sup 13/C into methane (Ni > Co > Ru).
- OSTI ID:
- 6313847
- Journal Information:
- J. Catal.; (United States), Vol. 56:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
CHEMICAL REACTION YIELD
CARBON MONOXIDE
METHANATION
COBALT
CATALYTIC EFFECTS
METHANE
RUTHENIUM
CARBON 13
CATALYSTS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
HYDROGEN
MEDIUM VACUUM
OXIDATION
PRESSURE DEPENDENCE
REDUCTION
SURFACE COATING
TRACER TECHNIQUES
ALKANES
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
CRYOGENIC FLUIDS
DEPOSITION
ELEMENTS
EVEN-ODD NUCLEI
FLUIDS
HYDROCARBONS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
METALS
NONMETALS
NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REFRACTORY METALS
STABLE ISOTOPES
TRANSITION ELEMENTS
YIELDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)