Catalyst composition for removing noxious components from a gaseous stream

Abstract

Abstract A highly active, stable and sulfur-resistant catalyst composition useful for substantially reducing the amount of carbon monoxide, hydrocarbons, nitrogen oxide and other noxious components in a gaseous stream is provided. Said catalyst composition comprises a specific refractory support material selected from the group consisting of (1) an alumina having a particle density of from about 0.3 to about 1.5 g/cc, a packed density of from about 0.2 to about 0.8 g/cc and a surface area of from about 10 to about 300 m2/g and (2) a monolithic ceramic having an external surface area of from about 100 to about 900 ft2/ft3, a bulk density of from about 10 to about 50 lb/ft3 and from about 2 to about 500 channels per square inch, said refractory support material having deposited thereon from about 0.01 to about 10 weight percent palladium and from about 0.05 to about 20 weight percent metal selected from the group consisting of rare earth, iron, manganese and zinc. The catalyst composition of this invention is effective at lower catalyst bed temperatures than other similar compositions, thus making it valuable when said gaseous stream is the exhaust effluent of an internal combustion engine during low-temperature operation, e.g. engine start-up. The catalyst composition also has excellent stability to aging in internal combustion engine exhaust effluent, even when the fuel to said engine contains up to 1000 ppm sulfur.

Inventors

• 👤 Stephen M Oleck
• 👤 William A Stover

Bibliographic Details