Method and device for cleaning the atmosphere
AssigneeEngelhard Corporation
InventorsJeffrey B. Hoke, Ronald M. Heck, Fred M. Allen
Life of this patent
Estimating the term…
Abstract
Method for treating atmospheric pollutants by contacting the atmosphere with a catalyst composition or adsorptive material coated on the surface of a substrate, preferably a motor vehicle radiator, in which the catalyst composition, preferably including a base metal, precious metal, or salts/oxides thereof, or adsorptive material, preferably including a zeolite, Group IIA alkaline earth metal oxide or carbon, is protected from degradation by harmful contaminants such as solid or aerosol particulates, water, SOx, NOx and water borne salts contained in the atmosphere by a coating of at least one porous protective material and a device useful therefor.
Claims19
A method for treating the atmosphere to catalytically convert atmospheric pollutants to less harmful materials comprising contacting the pollutant containing atmosphere with a stationary surface which has been coated with a catalyst composition selected from base metals, precious metals, salts and oxides thereof and combinations thereof, the catalyst composition being protected with an overcoat of at least one porous protective material selected from carbon, zeolites, clays, alumina, high surface area silica containing aluminum oxide, silica containing high surface area alumina, titania, zirconia, silica, rare earth oxides and mixtures thereof, said protective material is sufficiently porous to enable said atmosphere containing said pollutants to pass therethrough into operative contact with the catalyst composition and sufficiently protective to substantially prevent catalyst degrading pollutants from contacting the catalyst composition.
A method for treating the atmosphere to catalytically convert atmospheric pollutants to less harmful materials comprising contacting the pollutant containing atmosphere with a stationary surface which has been coated with encapsulated particles of a catalyst composition said catalyst composition selected from base metals, precious metals, salts and oxides thereof and combinations thereof, said particles having been protected by encapsulation prior to their use for coating said surface with at least one porous protective material selected from carbon, zeolites, clays, alumina, high surface area silica containing aluminum oxide, silica containing high surface area alumina, titania, zirconia, silica, rare earth oxides and mixtures thereof said protective material is sufficiently porous to enable said atmosphere containing said pollutants to pass therethrough into operative contact with the catalyst composition and sufficiently protective to prevent catalyst degrading pollutants from contacting the catalyst composition.
Dependencies are inferred from the claim text.