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US 2003/0083192 A1Published application
Catalyst for automobiles
AssigneeDenso Corporation
InventorsTakumi Suzawa, Masakazu Tanaka, Kazuhiko Koike, Miho Ito
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AssigneeDenso Corporation
InventorsTakumi Suzawa, Masakazu Tanaka, Kazuhiko Koike, Miho Ito
Estimating the term…
This invention aims at achieving early activation by use of a catalytic body having a low thermal capacity, and a low pressure loss, without using a coating layer to reduce exhaust emission. The invention is directed also to improve exhaust purification performance by improving the combination of catalytic bodies and performance of each catalytic body. In the invention, a start catalyst 1 is arranged at an upstream portion of an exhaust pipe P of a car engine E and a three way catalyst 2 is disposed on the downstream side. The start catalyst 1 can directly support catalytic components through chemical bonds by incorporating replacing elements into a substrate ceramic having high heat resistance such as cordierite. Because a coating layer is not necessary, the catalyst of the invention has a low heat capacity and a large open area and achieves reduction of exhaust emission, and reduction of a pressure loss, through early activation.
A catalyst for automobiles including a plurality of catalytic bodies disposed at intermediate positions of an exhaust passage of an internal combustion engine of an automobile, wherein said catalytic body disposed at the position nearest to said internal combustion engine among said plurality of catalytic bodies is a direct support catalyst comprising a ceramic support capable of directly supporting a catalyst on a surface of a substrate ceramic, and catalytic components directly supported by said ceramic support.
A catalyst for automobiles including a multi-stage integration type catalyst formed by integrating a plurality of catalyst layers at an intermediate position of an exhaust passage of an internal combustion engine of an automobile, wherein the foremost stage catalyst layer disposed at the nearest position to said internal combustion engine among said plurality of catalyst layers is a direct support catalyst comprising a ceramic support capable of directly supporting a catalyst on a surface of a substrate ceramic, and catalytic components directly supported by said ceramic support.
A catalyst for automobiles including a start catalyst disposed at an upstream portion of an exhaust passage of an internal combustion engine of an automobile and a main catalyst disposed on its downstream side, wherein said start catalyst is a direct support catalyst comprising a ceramic support capable of directly supporting a catalyst on a surface of a substrate ceramic, and catalytic components directly supported by said ceramic support.
Dependencies are inferred from the claim text.