Thermally stable coprecipitated catalysts useful for methanation and other reactions

Patent · Tue Oct 26 04:00:00 EDT 1976

OSTI ID:6748585

Hansford, R C

Union Oil Co. of California's new methanation catalysts are specially prepared for greater activity and thermal stability than conventional catalysts. Consisting of alumina and one or more of the metals iron, cobalt, nickel, copper, and zinc, these catalysts are prepared from aqueous solutions containing a dissolved aluminum salt, a salt of at least one of the above metals in divalent form, and a delayed precipitant such as urea. With all components in homogeneous solution at a relatively low pH and temperature, the solution is heated to a temperature sufficient to hydrolyze the delayed precipitant. This liberates ammonia and carbon dioxide homogeneously throughout the solution until the pH of the solution rises sufficiently to effect coprecipitation of the metal salts as hydroxides and/or carbonates. The resulting coprecipitate is then recovered, washed, dried, shaped, and calcined in conventional fashion. The final product is very active and displays much greater thermal stability than corresponding previous catalysts prepared by nonhomogeneous coprecipitation with alkaline, ionic reagents such as sodium carbonate, ammonium hydroxide, or ammonium carbonate.

• Assignee: Union Oil Co.
• Patent Number(s): US 3988263
• OSTI ID: 6748585
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMMONIA
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT
COPPER
DISPERSIONS
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
IRON
METALS
METHANATION
MIXTURES
NICKEL
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SALTS
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENTS
ZINC