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Diesel particulate filter

A technology for diesel vehicles and particulates, which can be used in exhaust devices, machines/engines, and noise reduction devices to solve problems such as fuel combustion rate deterioration

Inactive Publication Date: 2006-11-01
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, even if the oxidation catalyst is arranged on the upstream side of the DPF and the fuel (HC component) is supplied to increase the exhaust gas temperature, the fuel combustion rate will deteriorate due to the supply of fuel.

Method used

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  • Diesel particulate filter
  • Diesel particulate filter
  • Diesel particulate filter

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Embodiment Construction

[0047] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0048] figure 1 Among them, 1 is the DPF arranged in the exhaust gas discharge passage 11 of the diesel engine 10, and the upstream side catalyst 12 is arranged in the exhaust gas discharge passage 11 on the upstream side of the flow of the exhaust gas from the DPF1. Either a NOx trap catalyst or an oxidation catalyst can be arranged as the upstream side catalyst 12 , or both can be arranged as the upstream side catalyst 12 .

[0049] The NOx trapping catalyst is a NOx absorbing material (alkaline earth represented by barium, etc.) that is supported on a carrier such as activated alumina to absorb NOx in the exhaust gas when the oxygen concentration in the exhaust gas is high (the air combustion is relatively large, that is, when the fuel is relatively lean). Metals, alkali metals), when the oxygen concentration in the exhaust gas is low (stoichi...

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Abstract

The present invention is intended to configure a diesel particulate filter to allow the burning rate of particulates to increase even with a small amount of catalytic metal or even without using any catalytic metal. In the diesel particulate filter, walls forming exhaust gas channels in a filter body on which the particulates are trapped are coated with a catalyst layer for promoting the burning of the trapped particulates. The catalyst layer contains a mixed oxide in which Ce, Zr and a rare earth element R other than Ce are contained in a Ce / (Ce+Zr) mole ratio between 10% and 90% both inclusive or between 20% exclusive and 80% inclusive.

Description

technical field [0001] The invention relates to a diesel vehicle exhaust particulate filter. Background technique [0002] In recent years, the development of technology for capturing fine particles (fine particulate matter, especially carbon) exhausted from a diesel engine by a filter and removing the captured fine particles by combustion has been vigorously pursued. [0003] A typical technique is known in which an oxidation catalyst is arranged on the upstream side of the exhaust gas flow rather than a diesel vehicle exhaust particulate filter (hereinafter referred to as a DPF), and HC components such as fuel are supplied to the oxidation catalyst. That is, the HC component is combusted by the oxidation catalyst, the temperature of the exhaust gas flowing into the DPF is increased by the combustion heat, and the NO in the exhaust gas is oxidized to NO by the oxidation catalyst. 2 , using the NO 2 and the exhaust gas that has become hotter to burn the fine particles of t...

Claims

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Application Information

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IPC IPC(8): F01N3/021F01N3/28
Inventor 原田浩一郎对尾良则高见明秀
Owner MAZDA MOTOR CORP