Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2011-07-26
2011-07-26
Nguyen, Cam N. (Department: 1736)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S242000, C502S243000, C502S261000, C502S262000, C502S302000, C502S303000, C502S304000, C502S339000, C502S344000, C502S347000, C502S349000, C502S352000, C502S439000
Reexamination Certificate
active
07985709
ABSTRACT:
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.
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Davis Patricia P.
Gulati Suresh T.
Jordan Jeffrey D.
Leighty Bradley D.
Oglesby Donald M.
Galus Helen M.
Nguyen Cam N.
The United States of America as represented by the Administrator
Warmbier Andrea Z.
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