Process for utilizing catalyst with high geometric surface area

Details Process for utilizing catalyst with high geometric surface area Process for utilizing catalyst with high geometric surface area

1984-11-13

1985-09-17

Doll, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423DIG13, 60299, B01D 5336

Patent

active

045419965

ABSTRACT:
An extrudate catalyst suitable for auto emission control is made from a solid, transitional alumina. It has a partially hollow interior and one or more platinum group metals deposited on the extrudate. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.

REFERENCES:
patent: 2212932 (1940-08-01), Fairlie
patent: 2408164 (1946-09-01), Foster
patent: 3907710 (1975-09-01), Lundsager
patent: 4476246 (1984-10-01), Kim et al.

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