Catalytic converter

A catalytic converter and catalyst layer technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve unclear exhaust gas purification catalyst catalytic converter, purification performance reduction, rhodium metallization Achieve excellent NOx purification performance, suppress pressure loss, and excellent OSC performance

Active Publication Date: 2016-10-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, as described above, when rhodium is supported on cerium oxide, the metallization of rhodium is inhibited, and NO x Reduced purification performance
On the other hand, if cerium oxide is increased in order to improve the oxygen absorption and desorption capacity, the pressure loss will increase.
[0010] That is, it is unclear whether the exhaust gas purification catalysts disclosed in Patent Documents 1 and 2 can provide OSC capability and NO x Catalytic converter with excellent performance in both purification performance

Method used

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Examples

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reference example 1

[0058] Reference example 1, the lower catalyst layer is a layer with Pt as a catalyst, which is Pt(0.2) / Al 2 o 3 (25)+CZ(30), the upper catalyst layer is a layer with Rh as a catalyst, which is Rh(0.12) / Ce-Zr composite oxide A(40)+Al 2 o 3 (20). Here, the unit of the numerical value in parentheses is g / L. First, using platinum nitrate, the Al 2 o 3 Pt / Al loaded with Pt 2 o 3 (Material 1). In addition, the impregnation method was used as a loading method. Next, throw material 1, CZ material, and Al into distilled water while stirring. 2 o 3 A binder was used to suspend it to prepare a slurry 1. Furthermore, the prepared slurry 1 was poured into the substrate, and unnecessary parts were blown off with a blower, thereby coating the slurry 1 on the wall surface of the substrate. At this time, the Pt layer was prepared such that the coating material was 0.2 g / L Pt, the material 1 was 25 g / L, and the CZ material was 30 g / L relative to the volume of the substrate. Finall...

reference example 2

[0060] Reference examples 2, 3, 4, the lower catalyst layer is a layer with Pt as a catalyst, which is Pt(0.2) / Al 2 o 3 (25)+CZ(30), the upper catalyst layer is a layer having Rh as a catalyst, which is Rh(0.12) / Ce-Zr composite oxide B, C, D(40)+Al 2 o 3 (20). In Reference Example 1, the specifications of the Rh carrier (material 2) used in Slurry 2 were changed to prepare a slurry, which was then coated, dried, and fired. In addition, with regard to the catalyst, except for changing the composition of the material 2 shown in Reference Example 1, no process change was performed. Reference Example 2 used a Ce-Zr composite oxide (B) with a Ce concentration of 0% by mass, Reference Example 3 used a Ce-Zr composite oxide (C) with a Ce concentration of 20% by mass, and Reference Example 4 used a Ce-Zr composite oxide (C) with a Ce concentration of 20% by mass. Ce-Zr composite oxide (D) having a concentration of 60% by mass.

[0061]

reference example 5

[0062] Reference examples 5, 6, 7, 8, the lower catalyst layer has Pt as the layer of catalyst, which is Pt(0.2) / Al 2 o 3 (25)+CZ(30), the upper catalyst layer is a layer having Rh as a catalyst, which is Rh(0.12) / Ce-Zr composite oxide B(40)+Al 2 o 3 (20) + Ce-Zr composite oxides with low SSA (4, 8, 12, 16). In Reference Example 1, various amounts of low-SSA Ce—Zr composite oxides were further added to slurry 2 to prepare slurry, which was then coated, dried, and fired. In addition, with regard to the catalyst, except for adding a low-SSA Ce—Zr composite oxide in the preparation step of the slurry 2 of Reference Example 1, no process change was performed. Reference example 5 added the Ce-Zr composite oxide of low SSA of 4 mass parts, reference example 6 added the Ce-Zr composite oxide of low SSA of 8 mass parts, reference example 7 added the low SSA of 12 mass parts Ce-Zr composite oxide, Reference Example 8 Added 16 parts by mass of Ce-Zr composite oxide with low SSA. Fu...

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Abstract

A catalytic converter with excellent OSC performance and NOx purification performance. The converter (10) includes a substrate (11) with a cell structure through which exhaust gas flows, and a catalyst layer (5) formed on a cell wall surface of the substrate (1). The catalyst layer (3) includes a lower catalyst layer (4) formed on a surface of the substrate (1) and an upper catalyst layer (5) formed on a surface of the lower catalyst layer (4). The upper catalyst layer (5) includes at least a zirconia support with rhodium carried thereon, and two types of ceria-zirconia-based composite oxides with different specific surface areas, each of the ceria-zirconia-based composite oxides having no rhodium carried thereon. The lower catalyst layer (4) includes an alumina support with platinum carried thereon, and a ceria-zirconia-based composite oxide.

Description

technical field [0001] The present invention relates to a catalytic converter housed and fixed in a pipe constituting an exhaust gas (exhaust gas) exhaust system. Background technique [0002] In various industries, various efforts to reduce the environmental impact load are being carried out on a global scale. Among them, in the automobile industry, not to mention gasoline engine vehicles with excellent fuel economy performance, so-called eco-friendly vehicles for hybrid vehicles and electric vehicles, etc. The popularity and its further performance-enhancing developments are progressing daily. In addition to the development of such an eco-friendly car, research on an exhaust gas purification catalyst for purifying exhaust gas discharged from an engine is also being actively carried out. The exhaust purification catalyst includes oxidation catalyst, three-way catalyst, NO x Storage and reduction catalysts, etc., in the exhaust gas purification catalysts, the catalytic act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/42F01N3/28
CPCB01J23/63B01D53/9422B01D2255/1021B01D2255/1025B01D2255/20715B01D2255/2092B01D2255/407B01D2255/9022B01D2255/906B01J35/0006B01J35/04B01J35/1009B01J35/1014B01J37/0244B01J37/0248B01J2523/00B01J2523/31B01J2523/36B01J2523/3706B01J2523/3712B01J2523/3725B01J2523/48B01J2523/822B01J2523/828B01J23/002B01J23/42B01J23/46F01N3/28F01N3/2828F01N2570/14
Inventor 铃木宏昌吉田健齐藤良典冈田满克
Owner TOYOTA JIDOSHA KK
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