Synthesis gas reactions using catalysts formed by oxidizing Ni-containing intermetallic compounds

Conference · Mon Jan 01 04:00:00 EST 1979 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:5204580

Imamura, H; Wallace, W E

Intermetallic compounds containing rare earths or actinides in chemical union with the transition metals Fe, Co or Ni are transformed when exposed to synthesis gas at elevated temperatures into mixtures of rare earth or actinide oxides and elemental Fe, Co or Ni. It has been found that these mixtures are exceptionally active for syngas conversion. The converted alloys have been characterized by Auger spectroscopy, x-ray diffraction, ESCA and electron microscopy. These studies showed that the surface regions consisted of transition metal nodules growing out of or dispersed on a substrate of rare earth or actinide oxide. The decomposed materials rather than the original alloy appear to be the catalytically active species for the reaction. Additionally, it has been found that thorium-containing intermetallics such as ThNi/sub 5/ readily reacted with elemental oxygen to form a mixture of metallic Ni and ThO/sub 2/. The oxidation of ThNi/sub 5/ occurred with a predominant formation of ThO/sub 2/ because of the strong chemical affinity of thorium for oxygen. During the oxidation reaction metallic Ni aggregates precipitated out in a fashion similar to that observed when the intermetallic is exposed to syngas. This mixture had higher activity for methane formation by an order of magnitude than oxide-supported catalysts prepared by conventional wet chemical procedures. In this work, the character of catalysts formed by the oxidation of several rare earth-nickel intermetallic compounds was studied in the manner used earlier to study the Th intermetallics. The resulting materials were examined as syngas conversion catalysts.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 5204580
• Report Number(s): CONF-800303-P3
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
COBALT
COHERENT SCATTERING
DATA
DATA FORMS
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROGENATION
INFORMATION
INTERMETALLIC COMPOUNDS
IRON
METALS
MICROSCOPY
NICKEL
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SYNTHESIS
SYNTHESIS GAS
TABLES
TESTING
TRANSITION ELEMENTS
X-RAY DIFFRACTION