Close coupled catalyst
First Claim
1. An article comprising:
- a gasoline engine having an exhaust outlet; and
a close coupled catalyst in communication with the exhaust outlet, the close coupled catalyst comprising a close coupled catalyst composition having substantially no oxygen storage components, the catalyst composition comprising;
a support;
a palladium component;
optionally, at least one alkaline metal oxide selected from the group consisting of strontium oxide, calcium oxide and barium oxide;
optionally, at least one platinum group metal component selected from the group consisting of platinum, rhodium, ruthenium and iridium components;
optionally, at least one rare earth oxide selected from the group consisting of neodymium oxide and lanthanum oxide; and
optionally, a second zirconium oxide.
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Abstract
A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare earth metal components selected from the neodymium and lanthanum components. The close-coupled catalyst composition includes substantially no additional oxygen storage component such as praseodymium or cerium compounds. There is preferably a catalyst such as a three-way catalyst downstream of the close-coupled catalyst. The downstream catalyst preferably includes an oxygen storage component such as cerium oxide or praseodymium oxide.
35 Citations
27 Claims
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1. An article comprising:
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a gasoline engine having an exhaust outlet; and
a close coupled catalyst in communication with the exhaust outlet, the close coupled catalyst comprising a close coupled catalyst composition having substantially no oxygen storage components, the catalyst composition comprising;
a support;
a palladium component;
optionally, at least one alkaline metal oxide selected from the group consisting of strontium oxide, calcium oxide and barium oxide;
optionally, at least one platinum group metal component selected from the group consisting of platinum, rhodium, ruthenium and iridium components;
optionally, at least one rare earth oxide selected from the group consisting of neodymium oxide and lanthanum oxide; and
optionally, a second zirconium oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An article comprising:
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a gasoline engine having an exhaust outlet;
a close coupled catalyst in communication with the exhaust outlet, the close coupled catalyst comprising a close coupled catalyst composition having substantially no oxygen storage components selected from the group consisting of cerium components and praseodymium components, the catalyst composition comprising;
a support;
a palladium component;
optionally, at least one alkaline metal oxide selected from the group consisting of strontium oxide, calcium oxide and barium oxide;
optionally, at least one platinum group metal component selected from the group consisting of platinum, rhodium, ruthenium and iridium components;
optionally, at least one rare earth oxide selected from the group consisting of neodymium oxide and lanthanum oxide; and
optionally, a second zirconium oxide; and
a downstream catalyst located downstream of and in communication with the close-coupled catalyst, the downstream catalyst comprising an oxygen storage component selected from the group consisting of cerium components and praseodymium components.
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20. A method comprising the steps of:
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operating a gasoline engine, having an exhaust gas outlet;
passing an exhaust gas stream comprising carbon monoxide and hydrocarbons, and optionally nitrogen oxide, from the exhaust gas outlet of the gasoline engine to a close coupled catalyst, the close coupled catalyst comprising a close coupled catalyst composition;
contacting the exhaust gas with the close coupled catalyst composition, the close coupled catalyst composition having substantially no oxygen storage components, the catalyst composition comprising;
a support;
a palladium component;
optionally, at least one alkaline metal oxide selected from the group consisting of strontium oxide, calcium oxide and barium oxide;
optionally, at least one platinum group metal component selected from the group consisting of platinum, rhodium, ruthenium and iridium components;
optionally, at least one rare earth oxide selected from the group consisting of neodymium oxide and lanthanum oxide; and
optionally, a second zirconium oxide; and
oxidizing at least some of the hydrocarbon and only a portion carbon monoxide in the presence of the close coupled catalyst. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification