Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Exhaust gas purification catalyst

一种废气净化、催化剂的技术，应用在物理/化学过程催化剂、催化剂活化/制备、金属/金属氧化物/金属氢氧化物催化剂等方向，能够解决没有研究压力损失、废气净化性能下降、废气净化性能降低等问题，达到优化废气净化性能的效果

Active Publication Date: 2022-04-19
TOYOTA JIDOSHA KK
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, when ceria-zirconia composite oxide is used as an OSC material, cerium contained in the composite oxide exhibits OSC performance, but reduces exhaust gas purification performance.
Therefore, if the amount of OSC material is increased in order to improve OSC performance, exhaust gas purification performance may decrease
In addition, if the amount of OSC material is increased in order to improve OSC performance, the pressure loss deteriorates
Therefore, in a catalyst for exhaust gas purification using an OSC material, OSC performance and exhaust gas purification performance are in conflict, and OSC performance and pressure loss are also in conflict. Improve OSC performance under conditions
[0008] In the catalysts for exhaust gas purification described in Patent Documents 1 to 4, pressure loss was not studied, and all of exhaust gas purification performance, OSC performance, and pressure loss were not presented at a high level.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Exhaust gas purification catalyst
  • Exhaust gas purification catalyst
  • Exhaust gas purification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0070] Hereinafter, the present invention will be described in more detail using examples. However, the technical scope of the present invention is not limited by these examples.

[0071] 1. OSC material

[0072] As the OSC material, ceria-zirconia (CeO 2 -ZrO 2 ) composite oxides.

[0073] Preparation of Ceria-Zirconia Composite Oxide (Pyrochlore ZC) with Pyrochlore Structure

[0074] will be CeO 2 49.1 g of a 28% by weight aqueous cerium nitrate solution in terms of ZrO 2 After dissolving 54.7 g of an aqueous zirconyl nitrate solution of 18% by weight in conversion and a commercially available surfactant in 90 mL of ion-exchanged water, 1.2 times the equivalent of NH was added to the anion. 3 In 25% by weight of ammonia water, a coprecipitate was generated, and the obtained coprecipitate was filtered and washed. Next, the obtained coprecipitate was dried at 110° C., and then fired at 500° C. in the air for 5 hours to obtain a solid solution of cerium and zirconium. T...

Embodiment 1、2 and comparative example 5

[0092] In Examples 1, 2, and Comparative Example 5, pyrochlore ZC was added to the slurry 2 for forming the upper layer of the catalyst coating so that the capacity relative to the substrate was 30 g / L, 50 g / L, and 70 g / L, respectively. Each catalyst was obtained in the same manner as in Comparative Example 4 except for the amount of L.

Embodiment 3、4 and comparative example 7

[0094] In Examples 3, 4, and Comparative Example 7, pyrochlore ZC was added to the slurry 2 for forming the catalyst coating layer of the upper layer, so that the capacity relative to the base material became 30 g / L, 50 g / L, and 70 g / L, respectively. Each catalyst was obtained in the same manner as in Comparative Example 6 except for the amount of L.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a catalyst for exhaust gas purification. [Problem] An object of the present invention is to provide a catalyst for exhaust gas purification which optimizes OSC performance and pressure loss. [Solution] A catalyst for exhaust gas purification, which has a substrate and two or more catalyst coatings formed on the substrate, wherein the uppermost catalyst coating contains: an OSC material having a pyrochlore structure, oxygen An OSC material whose absorption and emission rate is faster than that of an OSC material having a pyrochlore structure, and a noble metal catalyst containing at least Rh; The material capacity is 30g / L-50g / L, and the content of the OSC material whose oxygen absorption and release rate is faster than the OSC material having a pyrochlore structure is 36g / L-72g / L relative to the above-mentioned base material capacity.

Description

technical field [0001] The present invention relates to a catalyst for exhaust gas purification. Background technique [0002] Exhaust gas from internal combustion engines such as automobiles contains harmful components such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx), and these harmful components are released into the atmosphere after being purified by exhaust gas purification catalysts. Conventionally, as the catalyst for purifying exhaust gas, a three-way catalyst that simultaneously oxidizes CO and HC and reduces NOx has been used. As the three-way catalyst, noble metals such as platinum (Pt), palladium (Pd), and rhodium (Rh) have been widely used. supported on alumina (Al 2 o 3 ), silicon oxide (SiO 2 ), zirconia (ZrO 2 ), titanium oxide (TiO 2 ) and other porous oxide carriers. [0003] In order to use such a three-way catalyst to effectively purify the above-mentioned harmful components in exhaust gas, the air-fuel ratio (A / F) of the ai...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J23/63B01D53/94B01D53/72B01D53/56B01D53/62
CPCB01D53/9418B01D2255/2092B01J37/088B01J23/58B01J37/0009B01J37/0201B01J23/464B01D2258/01B01J37/0244B01D2255/9022B01D2255/908B01D2255/1021B01D2255/1023B01D2255/1025B01D2255/407B01D53/945Y02T10/12B01J35/19B01J23/42B01J23/44B01J23/002B01D2255/207B01D2257/404B01D2257/502B01D2257/70B01J35/56
Inventor 镇西勇夫铃木宏昌
Owner TOYOTA JIDOSHA KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com