Hollow ceramic balls as automotive catalysts supports

Details Hollow ceramic balls as automotive catalysts supports Hollow ceramic balls as automotive catalysts supports

1975-03-21

1977-08-02

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252477R, B01J 2906, B01J 3500

Patent

active

040394808

ABSTRACT:
A method for producing essentially spherical dry pellets largely comprising combustible materials, a method for using the pellets as cores by uniformly coating them with a ceramic-forming powder and sintering the powder to volatilize the combustible core material and form hollow ceramic balls, and a method for using the balls as catalyst supports by coating them with platinum and palladium salts and reducing the salts to elemental metals so that satisfactory oxidizing catalysts are obtained. When the ceramic is an aluminosilicate such as mullite, satisfactory oxidizing catalysts are obtained that pass the bulk density, crush strength, dust-free surface, and oxidizing temperature requirements of specifications developed to meet automobile exhaust emission requirements.

REFERENCES:
patent: 2553759 (1951-05-01), Geiger
patent: 2941960 (1960-06-01), Hindin et al.
patent: 3150989 (1964-09-01), Parsons
patent: 3347798 (1967-10-01), Baer et al.
patent: 3377269 (1968-04-01), Bloch
patent: 3455843 (1969-07-01), Briggs et al.
patent: 3467602 (1969-09-01), Koester
patent: 3798176 (1974-03-01), Ao et al.

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