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Exhaust gas purifying apparatus

A technology of exhaust purification device and exhaust treatment device, which is applied in the direction of exhaust device, noise reduction device, electrical control, etc. It can solve the problems of not mentioning the proportion and not considering the temperature rise of the exhaust treatment device, etc., and achieve the effect of easy temperature rise

Inactive Publication Date: 2005-09-07
MITSUBISHI FUSO TRUCK AND BUS CORPORATION
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AI Technical Summary

Problems solved by technology

[0012] In this case, platinum and palladium are used in the particulate catalyst supported on the surface of heat-resistant metal particulates in the combustion catalyst, but the ratio of the two components is not mentioned, and the influence of the fuel supply on the catalyst gas flow is not considered. Temperature rise of downstream side exhaust treatment device

Method used

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Embodiment Construction

[0032] In the following, various embodiments of the present invention shown in the legends are described, in which the same parts are given the same reference numerals.

[0033] figure 1 In the exhaust passage 11 of the vehicle diesel engine 10, an oxidation catalyst device 12 and a particulate filter 13 are provided in this order from the air flow upstream side. In the oxidation catalyst device 12 , particulate platinum and palladium are carried on the surface of a honeycomb support made of cordierite using alumina as a binder.

[0034] In addition, during operation of the diesel engine 10, when the exhaust gas flowing from the diesel engine 10 to the exhaust passage 11 flows through the particulate filter 13, particulates such as dust contained in the exhaust gas are trapped and removed, It is discharged to the air flow downstream side of the particulate trap filter 13 in a purified state.

[0035] Furthermore, an injector 14 is provided on the upstream side of the air fl...

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Abstract

An oxidation catalyst apparatus and a particulate collecting filter are provided sequentially from an upstream side in an exhaust gas passage of a diesel engine. A ratio of the weight of Pd to a sum of the weights of Pt and Pd carried on the oxidation catalyst apparatus is satisfactory with the following inequality: 0.05<=Pd / (Pt+Pd)<=0.75. When the rise of the temperature of the particulate collecting filter is needed, fuel is supplied into the oxidation catalyst apparatus.

Description

technical field [0001] The present invention relates to installation of a device capable of purifying exhaust gas flowing through the exhaust passage of a vehicle diesel engine or the like. Background technique [0002] As a conventional device installed in the exhaust passage of a diesel engine and capable of removing particles such as dust in the exhaust gas flowing through the exhaust passage, its main components are as follows: Figure 5 As shown, the platinum oxidation catalytic device 1 on the upstream side of the airflow and the particulate filter 2 on the downstream side of the airflow are installed; wherein, (A) during the operation of the diesel engine, the nitrogen monoxide contained in the exhaust gas is absorbed by the catalytic device The platinum oxidation catalyst in 1 is oxidized to generate nitrogen dioxide as shown in the following (1), and this nitrogen dioxide component oxidizes the carbon in the particulates collected by the filter 2, and burns the parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/02B01D46/42B01D53/94B01J23/44F01N3/035F01N3/10F01N3/24F01N3/28F01N3/36F02D41/04
CPCF01N2250/02F01N3/035B01D53/945Y02T10/22Y02T10/12A63H33/18
Inventor 百目木礼子武田好央平沼智
Owner MITSUBISHI FUSO TRUCK AND BUS CORPORATION
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