Catalyst for vehicle
A catalyst and catalyst layer technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of heat capacity reduction and limitation
Inactive Publication Date: 2003-04-30
DENSO CORP
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- Application Information
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Problems solved by technology
[0005] However, in prior art catalysts, it is necessary to form a coating 103 to support catalyst components
Therefore, when only by reducing the thickness of the cell walls 102 of the catalyst carrier 101, the reduction of the heat capacity is limited.
Method used
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[0032]Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a schematic diagram showing the overall structure of a catalyst for automobiles according to a first embodiment of the present invention. An exhaust pipe P, which is an exhaust passage, is connected to a combustion chamber E1 of an automobile engine E. As shown in FIG. The starting catalyst 1 and the three-way catalyst 2 are arranged in the middle of the exhaust passage from the upstream side. For example, the starting catalyst 1 is disposed at a high-temperature portion immediately below the exhaust branch pipe. For earlier, the size of the starting catalyst 1 is smaller than that of the three-way catalyst 2 as the main catalyst. The three-way catalyst 2 is a so-called "underfloor catalyst" and is disposed in the middle portion of the exhaust pipe P under the vehicle compartment. Oxygen sensors 31 and 32 are provided upstream of the starter ca...
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Abstract
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 high open area and achieves reduction of exhaust emission, and reduction of pressure loss, through early activation.
Description
field of invention [0001] The present invention relates to a catalyst for automobiles for purifying exhaust gas emitted from internal combustion engines of automobiles. Background technique [0002] In order to protect the environment, the requirements for exhaust gas purification have been continuously increasing in recent years. To deal with this problem, combustion control for internal combustion engines to control the emission of pollutants and catalytic methods have been developed. Heretofore, three-way catalysts have been widely used as catalysts for such catalyst systems. Three-way catalysts efficiently purify HC, CO, and NO at stoichiometric air-fuel ratios in the operating window x . Because the air-fuel ratio must be controlled within a narrow range in a three-way catalyst, the use of an improved NO x A system that restores potency. [0003] as attached Figure 8 As shown in , these catalyst bodies usually use a monolithic catalyst carrier 101 made of high hea...
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IPC IPC(8): F01N3/10B01D53/94B01J35/00B01J35/04B01J37/02F01N3/08F01N3/24F01N3/28F01N13/02
CPCB01J35/04F01N3/0842F01N3/0814B01J35/0006F01N13/02B01D53/9454F01N2013/026F01N3/2828Y02T10/22F01N13/0097F01N13/009Y02A50/20Y02T10/12
Inventor 须泽匠田中政一小池和彦伊藤弥奉
Owner DENSO CORP