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US 4,541,996 AGranted
Process for utilizing catalyst with high geometric surface area
AssigneeW. R. Grace & Co.
InventorsCarmo J. Pereira, Louis Hegedus, James M. Maselli
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AssigneeW. R. Grace & Co.
InventorsCarmo J. Pereira, Louis Hegedus, James M. Maselli
Estimating the term…
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.
A method of converting noxious components of exhaust gas to innocuous entities, said noxious components comprising carbon monoxide, hydrocarbons, and nitrogen oxides, which comprises contacting said gases with a catalyst comprising a solid, transitional alumina extrudate support structure having a cylindrical, hollow annular configuration with internal reinforcing vanes, a nitrogen surface area of at least 50 m.sup.2 /g;
Dependencies are inferred from the claim text.