Small bead auto exhaust catalyst

Details Small bead auto exhaust catalyst Small bead auto exhaust catalyst

1983-07-27

1985-04-23

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502330, 502332, 502333, 502334, 4232135, B01J 2104, B01J 2310, B01J 2358

Patent

active

045131015

ABSTRACT:
Alumina particle catalysts which can be used for auto emission control and especially as a three-way catalyst have increased performance. The alumina particles which are preferably spheroids have a low compacted bulk density of about 20 to 36 pounds per cubic foot and a smaller size on the order of less than 2.6 mm for the preferred spheroids. The spheroid embodiment also has a high crush strength. Because of the small size the ratio of the geometric surface area to the bulk volume (GSA/BV) is at least about 14 cm.sup.2 /cm.sup.3. These alumina particles are impregnated with a catalytically-effective amount of one or more platinum group metals such as platinum, palladium or rhodium and additional promoters can also be added. In the preferred embodiment the alumina particles have a GSA/BV ratio of from about 17 to 25 cm.sup.2 /cm.sup.3 for substantially improved performance.

REFERENCES:
patent: 4390456 (1983-06-01), Sanchez et al.
patent: 4392987 (1983-07-01), Laine et al.
Ernest et al, "Development of More Active and Durable Automotive Exhaust Catalysts", Society of Automotive Engineers, Paper No. 800083, Feb. 1980.

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