Ruthenium stabilization for improved oxidation/reduction catalyst systems
AssigneeAdministrator of the National Aeronautics and Space Administration
InventorsJeffrey D. Jordan, Anthony Neal Watkins, Jacqueline L. Schryer, Donald M. Oglesby
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Abstract
This invention relates generally to a stabilization mechanism for use in oxidation/reduction catalyst systems. It particularly relates to a ruthenium stabilization mechanism that enables the use of inexpensive metallic species within catalyst systems targeted for the elimination of toxic emissions such as carbon monoxide, hydrocarbons, and other volatile organics, and specifically nitrogen oxide species. Said stabilization mechanism includes the use of zirconium-oxides in an oxidation-reduction catalyst.
Claims10
An improved oxidation-reduction catalyst comprising:
- a reducing species consisting of ruthenium;
- a stabilizing species consisting of zirconium;
- an oxidizing species selected from the group consisting of platinum, palladium, silver, and gold;
- and
- a first metal oxide which possesses more than one stable oxidation state including at least tin oxide.
A process for the oxidation of carbon monoxide and volatile organic compounds and the reduction of nitrogen oxide which process comprises exposing carbon monoxide, volatile organic compounds, and nitrogen oxide to a catalyst comprising:
- a reducing species consisting of ruthenium;
- a stabilization species consisting of zirconium;
- an oxidizing species selected from the group consisting of platinum, palladium, silver, and gold;
- and
- a first metal oxide which possesses more than one stable oxidation state including at least tin oxide.
Dependencies are inferred from the claim text.