Back to results
US 5,292,991 AGranted
Process for removal of hydrocarbons carbon manoxide, and oxides of nitrogen from oxygen-containing waste gas using molecular sieve-palladium-platinum catalyst on a substrate
AssigneeCorning Incorporated
InventorsIrwin M. Lachman, Mallanagouda D. Patil, Louis S. Socha, Jr., Srinivas H. Swaroop, Raja R. Wusirika
Life of this patent
Estimating the term…
Abstract
A process of using a catalyst system for the oxidation of hydrocarbons, carbon monoxide, and the reduction of nitrogen oxides is provided. The unique synergy of the catalyst system, a combination of molecular sieves and noble metals, provides a system that partially or entirely replaces the need for rhodium as a catalyst in three way catalyst systems.
Claims12
A process for the removal of hydrocarbons, carbon monoxide, and oxides of nitrogen from oxygen-containing waste gas comprising:
- A) providing a substrate supporting a catalyst, the catalyst comprising a washcoat consisting of:
- (1) zeolite selected from the group consisting of ZSM zeolite and silicalite, the zeolite being mixed with high surface area oxide, and
- (2) a noble metal, the noble metal selected from the group consisting of platinum and palladium,
- the washcoat being characterized in that substantially all of the noble metal is sited on the high surface area oxide such that both the noble metal and the zeolite are available to catalyze reactants in the waste gas most suited for their respective properties;
- and
- B) contacting the waste gas with the noble metal and the zeolite to oxidize hydrocarbons and carbon monoxide to carbon dioxide and water, and to reduce oxides of nitrogen to nitrogen and water.
3 more elements
Dependencies are inferred from the claim text.