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Exhaust gas purification apparatus

An exhaust purification device, exhaust flow technology, applied in exhaust devices, mufflers, other chemical processes, etc., can solve problems such as difficulty in meeting emission control standards

Inactive Publication Date: 2008-11-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the technique according to Japanese Patent Application Laid-Open No. 2002-177779 is difficult to meet emission control standards in the near future

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Based on the results of the above test examples, the Figure 4 exhaust purification device. This exhaust purification device is constituted by a catalytic converter 2 provided as an underfloor catalytic converter in an exhaust system of a diesel engine 1 having a displacement of 2000 cc. The catalytic converter 2 is composed of an upstream catalyst 3 , a midstream catalyst 4 and a downstream catalyst 5 arranged in series sequentially from the upstream side to the downstream side in the exhaust gas flow direction. The upstream catalyst 3 and the midstream catalyst 4 are NSR with a straight-flow structure, and the downstream catalyst 5 is a DPNR with a wall-flow structure. The catalytic converter 2 is provided with an injector 6 for adding fuel to the exhaust gas on the upstream side.

[0083] The upstream catalyst 3 supports 0.3 mol / L Li as the NOx storage material, and the midstream catalyst 4 supports 0.15 mol / L Ba as the NOx storage material. In addition, the downs...

Embodiment 2

[0094] Except that the upstream catalyst 3 supports 0.3 mol / L Mg as the NOx storage material, the midstream catalyst 4 supports 0.15 mol / L Sr as the NOx storage material, and the downstream catalyst 5 supports 0.3 mol / L Cs as the NOx storage material. Except for the materials, the manufacturing method of the exhaust purification device is the same as in Example 1.

Embodiment 3

[0096] In addition to the upstream catalyst 3 carrying 0.2mol Li and 0.05mol / L Mg as NOx storage materials, the midstream catalyst 4 carrying 0.075mol / L Ba and 0.075mol / L Ca as NOx storage materials, and the downstream catalyst 5 The manufacturing method of the exhaust purification device was the same as in Example 1 except that 0.15 mol / L of Cs and 0.15 mol / L of Na were supported as NOx storage materials.

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PUM

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Abstract

An exhaust gas purification apparatus for diesel engine that is enhanced in NOx purification performance and PM purification performance. There is provided an exhaust gas purification apparatus comprising upstream catalyst (3) of straight flow structure carrying a first NOx occluding material capable of effectively occluding NOx in a low temperature region and carrying a noble metal; midstream catalyst (4) of straight flow structure carrying a second NOx occluding material capable of effectively occluding NOx in an intermediate temperature region and carrying a noble metal; and downstream catalyst (5) of wall flow structure carrying a third NOx occluding material capable of effectively occluding NOx in a high temperature region and carrying a noble metal. Enhancing of the NOx purification performance and PM purification performance can be attained as the three types of catalysts individually occlude NOx satisfactorily in correspondence to exhaust gas temperatures.

Description

technical field [0001] The present invention relates to an exhaust gas purification device capable of efficiently purifying NOx and PM contained in exhaust gas discharged from a diesel engine. Background technique [0002] Regarding gasoline engines, strict exhaust emission control standards have been established and technological progress has been made, so that the amount of harmful components in exhaust gas has been greatly reduced. However, diesel engines emit harmful components in the form of PM (mainly comprising carbon particles such as soot, high molecular weight hydrocarbon particles, and sulfur-based particles such as sulfates), making it more difficult to purify the exhaust gas compared to gasoline engines. gas. [0003] Up to now, the exhaust gas purification devices of diesel engines are roughly divided into two types, namely the well-known trapping type exhaust gas purification devices (wall flow) and open type exhaust gas purification devices (straight flow). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01D53/86B01D53/94B01J35/04F01N3/08F01N3/10F01N3/24F01N3/28B01J20/04
CPCF01N3/0871F01N3/0842B01J23/58B01D2255/91B01D53/9481B01J21/06F01N2013/026B01J35/0006B01J35/04F01N3/0807B01J37/0205B01J37/0242F01N3/206F01N3/035F01N13/0097B01D53/86B01D53/94F01N3/08
Inventor 小仓义次
Owner TOYOTA JIDOSHA KK
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