Unlock instant, AI-driven research and patent intelligence for your innovation.

Double-base precious metal DOC catalyst for purifying diesel exhaust and preparation method thereof

A tail gas purification and noble metal technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor heat resistance of DOC catalysts, low HC conversion efficiency, loss of activity of noble metal catalyst coatings, etc. problems, to achieve the effect of high temperature aging resistance and high catalytic oxidation performance

Inactive Publication Date: 2018-02-02
NANJING IKAKAT EMISSIONS TECH CO LTD
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical application, there are disadvantages and deficiencies such as poor heat resistance of DOC catalyst, noble metal catalyst coating is easy to sinter and lose activity at high temperature, and low conversion efficiency of HC in low temperature cold start stage.

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
  • Double-base precious metal DOC catalyst for purifying diesel exhaust and preparation method thereof
  • Double-base precious metal DOC catalyst for purifying diesel exhaust and preparation method thereof
  • Double-base precious metal DOC catalyst for purifying diesel exhaust and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare a slurry with a precious metal loading of 60g / ft3, pt:pd=2:1, and a coating loading of 80g / l. The slurry is composed of 70% alumina and 30% cerium-zirconium oxide; Coating carrier specifications are height*diameter*mesh*wall thickness 80mm*90mm / 400cpsi / 4mil;

[0023] 1. Grinding slurry: Weigh 700g of alumina powder and 300g of cerium-zirconium oxide powder, mix the two, add them to 1500g of water, and prepare an initial slurry with a solid content of 40%, put the initial slurry into sand Grind in the mill, detect the particle size of the slurry during the grinding process, and test the particle size of the slurry with a laser particle size analyzer. When the particle size D50 of the slurry is between 3-5 μm, stop the grinding, take out the slurry from the grinding tank, and fully stir the slurry , the solid content of the test slurry is 40%, and it is set aside.

[0024] 2. Add precious metal solution to the slurry:

[0025] Take by weighing 56.998g of the pal...

Embodiment 2

[0032] Prepare and prepare the monoplatinum precious metal catalyst according to the above method, the precious metal load is 60g / ft3, pt:pd=1:0, the coating load is 80g / l slurry, and the slurry is composed of 70% alumina, cerium zirconium The oxide content is 30% slurry; the coating carrier specification is height*diameter*mesh*wall thickness 80mm*90mm / 400cpsi / 4mil;

[0033] 1. Grinding slurry: Weigh 700g of alumina powder and 300g of cerium-zirconium oxide powder, mix the two, add them to 1500g of water, and prepare an initial slurry with a solid content of 40%, put the initial slurry into sand Grind in the mill, detect the particle size of the slurry during the grinding process, and test the particle size of the slurry with a laser particle size analyzer. When the particle size D50 of the slurry is between 3-5 μm, stop the grinding, take out the slurry from the grinding tank, and fully stir the slurry , the solid content of the test slurry is 40%, and it is set aside.

[0...

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

PropertyMeasurementUnit
Volumeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a double-base precious metal DOC catalyst for purifying diesel exhaust and a preparation method thereof. The preparation method comprises the following steps: S1, mixing aluminium oxide powder and ceriumzirconium oxide, and preparing mixed powder into slurry with the solid content of 30 to 40 percent; S2, regulating the pH values of the slurry by using HAC or NH3.H2O, respectively diluting precious metal pt salt solution and pd salt solution by using deionized water, fully stirring the precious metal salt solution, and slowing adding the precious metal pt salt solutioninto the pt salt solution dropwise; S3, slowly adding the solution which contains two precious metal salts into a certain mass of the slurry which is prepared through the step S1, and preparing double-base precious metal pt-pd slurry, namely, the double-base precious metal DOC catalyst. The application of the catalyst disclosed by the invention and a DOC+DPF matching strategy of an EGR engine system meet the requirements of National V Emission Standards for Motor Vehicles.

Description

technical field [0001] The invention relates to a double-base noble metal DOC catalyst for purifying diesel exhaust gas and a preparation method thereof. Background technique [0002] In recent years, the development momentum of diesel vehicles is very rapid. Compared with gasoline vehicles, diesel vehicles have many advantages such as superior environmental performance, good power performance and less fuel consumption. Therefore, compared with gasoline vehicles, diesel vehicles have better economy, and are more and more concerned and favored by everyone. At the same time, diesel vehicle exhaust emission standards are becoming increasingly stringent, which also puts forward higher requirements for diesel vehicle exhaust after-treatment technology. Among them, the diesel vehicle oxidation catalyst (DOC,) is one of the important exhaust gas purification catalysts in the diesel vehicle exhaust gas treatment system. [0003] DOC is installed in the exhaust system of diesel ve...

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
IPC IPC(8): B01J23/63B01J37/03B01J37/02B01D53/94B01D53/56
Inventor 孔庆梅胡广舒慧敏何俊俊
Owner NANJING IKAKAT EMISSIONS TECH CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com