Polyfunctional catalysts and method of use

Details Polyfunctional catalysts and method of use Polyfunctional catalysts and method of use

B - Operations, Transporting

01

J

23/342, 252/45,

B01J 21/04 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01) B01J 23/56 (2006.01) B01J 23/64 (2006.01) B01J 23/89 (2006.01) B01J 37/02 (2006.01)

Patent

CA 1083124

Abstract of the Disclosure This invention provides polyfunctional catalysts comprising one or more platinum group metals and a substantially larger quantity of base metal oxides, deposited in a suitable carrier or support. In a preferred embodiment, the catalyst is 1-20 weight percent base metal oxide, typically nickel oxide; 0.05-0.5 weight percent platinum; and 0.002-0.3 weight percent rhodium, on a coated monolith or other support. The improved catalyst is especially applicable for purifying exhaust gases from combustion processes, and in particular those from internal combustion engines. These polyfunctional catalysts have, in a single formulation the ability to accomplish four objectives - to oxidize carbon monoxide and to oxidize unburned hydrocarbons while reducing nitrogen oxides, thereby converting these contaminants found in the exhaust of internal combustion engines into carbon dioxide, water and elemental nitrogen, but without producing sulfur trioxide or sulfuric acid. Such chemical conversions take place over the catalyst when the ratio of air to fuel supplied for combustion is controlled to nearly stoichiometric conditions, thereby maintaining the exhaust gases within a narrow composition range, sometimes called a "window", in which the catalyst can substantially convert the contaminants.

259832

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