United States of America As Represented by the Administrator of Nasa

Jacqueline L Schryer

Donald M Oglesby

Anthony Neal Watkins

Bradley D Leighty

Jeffrey D Jordan

Suresh Thakordas Gulati

David R Schryer

Patricia P Davis

Jerry C Summers

JoAnne L Ingram

JoAnne L Patry

The invention described herein involves a novel approach to the production of oxidation/reduction catalytic systems. The present invention serves to stabilize the tin oxide reducible metal-oxide coating by co-incorporating at least another metal-oxide species, such as zirconium. In one embodiment, a third metal-oxide species is incorporated, selected from the group consisting of cerium, lanthanum, hafnium, and ruthenium. The incorporation of the additional metal oxide components serves to stabilize the active tin-oxide layer in the catalytic process during high-temperature operation in a reducing environment (e.g., automobile exhaust). Moreover, the additional metal oxides are active components due to their oxygen-retention capabilities. Together, these features provide a mechanism to extend the range of operation of the tin-oxide-based catalyst system for automotive applications, while maintaining the existing advantages.

Methodology for the effective stabilization of tin-oxide-based oxidation/reduction catalysts

An oxidation catalyst system is formed by particles of an oxidation catalyst dispersed in a porous sol-gel binder. The oxidation catalyst system can be applied by brush or spray painting while the sol-gel binder is in its sol state.

Sol-gel based oxidation catalyst and coating system using same

Stabilized tin-oxide-based oxidation/reduction catalysts

This invention relates generally to a ruthenium stabilized oxidation-reduction catalyst useful for oxidizing carbon monoxide, and volatile organic compounds, and reducing nitrogen oxide species in oxidizing environments, substantially without the formation of toxic and volatile ruthenium oxide species upon said oxidizing environment being at high temperatures.

Oxidation-reduction catalyst and its process of use

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Hampton, VA, United States of America

Jacqueline L Schryer