Studies of the methanation catalysts ThNi/sub 5/ and ZrNi/sub 5/ by Auger and characteristic energy loss spectra
Journal Article
·
· J. Solid State Chem.; (United States)
ThNi/sub 5/ and ZrNi/sub 5/ (fresh, used, and H/sub 2/S poisoned) have been examined by Auger spectroscopy (AES) and Characteristic Energy Loss Spectroscopy (CELS) to elucidate the strikingly different behavior of these materials as methanation catalysts. With use ZrNi/sub 5/ is transformed into Ni supported on ZrO/sub 2/ and ThNi/sub 5/ into Ni supported on ThO/sub 2/. AES indicates that the Ni on ZrO/sub 2/ is heavily overlaid with graphite. This does not occur with Ni and ThO/sub 2/, accounting for the exceptional activity of this catalyst compared to Ni on ZrO/sub 2/. Plasmon excitation energy determined from CELS are consistent with this picture. The large amount of surface Ni for the transformed ThNi/sub 5/ catalyst accounts for its high resistance to H/sub 2/S poisoning compared to that of ZrNi/sub 5/. A strong CELS peak is observed at 6.5 eV in ZrNi/sub 5/ and ThNi/sub 5/ as well as in elemental Ni, suggesting a very similar band structure for these materials. In this respect Ni and the Ni intermetallics are similar to Co and Co intermetallics as deduced from photoemission studies and recent APW band calculations.
- Research Organization:
- Univ. of Pittsburgh
- OSTI ID:
- 6748588
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 25:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ACTINIDE ALLOYS
ALKANES
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELECTRON SPECTROSCOPY
ENERGY LOSSES
ENERGY SOURCES
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
HIGH BTU GAS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INTERMETALLIC COMPOUNDS
METHANATION
METHANE
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORGANIC COMPOUNDS
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THORIUM ALLOYS
ZIRCONIUM ALLOYS
010404 -- Coal
Lignite
& Peat-- Gasification
090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ACTINIDE ALLOYS
ALKANES
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELECTRON SPECTROSCOPY
ENERGY LOSSES
ENERGY SOURCES
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
HIGH BTU GAS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INTERMETALLIC COMPOUNDS
METHANATION
METHANE
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORGANIC COMPOUNDS
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THORIUM ALLOYS
ZIRCONIUM ALLOYS