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

Three-way catalyst for treatment of tail gas of automobile and preparation method thereof

A three-way catalyst and automobile exhaust technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of complex catalyst preparation process, easy loss of active components, and easy sintering of precious metals, etc. To achieve the effect of inhibiting precious metal agglomeration, reducing migration and firm adhesion

Inactive Publication Date: 2018-07-13
CHONGQING BRILLIANT TIGER CATALYTIC
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Three-way catalysts usually use ceramic honeycomb as the substrate, coated with activated alumina as the carrier, and then support noble metals Pt, Pd, Rh, etc. as active components to prepare a monolithic catalyst. The catalyst has two functions of catalytic oxidation and catalytic reduction, although It can effectively reduce the emission of HC, CO and NOx, but the preparation process of the catalyst is complicated and the cost of precious metals is high
The traditional preparation process, as described in patents CN200510062095.0, CN201510207711.0 and CN201310358641.X, adopts the coating method of direct immersion, and both the carrier and the active component need to be impregnated, dried and roasted multiple times to obtain the catalyst, not only The preparation process is complicated, the active components are easy to lose, the coating is easy to fall off, and after repeated drying and roasting, the precious metal is easy to sinter, and the utilization rate is low

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
  • Three-way catalyst for treatment of tail gas of automobile and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A preparation method of a three-way catalyst for automobile exhaust gas treatment includes the following steps:

[0022] (1) Preparation of Pd layer slurry: first dissolve the rare earth additive nitrate with an appropriate amount of deionized water, and then add the cerium-zirconium composite oxide and modified γ-Al 2 O 3 After stirring uniformly, add palladium nitrate solution, stir for 12-24 hours, add binder, continue to stir for 30-60min, adjust the pH value, and add water to adjust to the required solid content, then ball mill for 30min-60min to obtain Pd layer slurry material;

[0023] (2) Preparation of Rh layer slurry: first dissolve the rare earth additive nitrate with an appropriate amount of deionized water, and then add the cerium-zirconium composite oxide and modified γ-Al 2 O 3 After stirring uniformly, add rhodium nitrate solution, stir for 12-24 hours, add binder, continue to stir for 30-60min, adjust the pH value, and add water to adjust to the required soli...

Embodiment 1

[0039] After dissolving 1.8g of zirconium nitrate in 70g of water, add 19g of γ-Al modified by La 2 O 3 Mix well with 29g of cerium-zirconium composite oxide, dilute 2.2g of palladium nitrate by 1 time and slowly add dropwise to the slurry, stir for 12 hours; after stirring, add 1.4g of binder, stir for 30min, and adjust the pH to 3. After adding 18g of water, ball mill for 30min to obtain Pd layer slurry;

[0040] After dissolving 1.4g zirconium nitrate in 55g water, add 15g γ-Al modified by La 2 O 3 Mix with 23g of cerium-zirconium composite oxide uniformly, dilute 0.46g of rhodium nitrate twice and slowly add dropwise to the slurry, and stir for 12 hours; after the stirring, add 1.1g of binder, stir for 30min, and adjust the pH to 3. After adding 16g of water, ball mill for 30 minutes to obtain Rh layer slurry;

[0041] The honeycomb specification is 101.6mm in diameter, 62mm in height, and 600 meshes in cell density. The Pd layer is applied to the two ends of the honeycomb by ...

Embodiment 2

[0044] After dissolving 1.8g zirconium nitrate and 1.3g neodymium nitrate in 70g water, add 19g γ-Al modified by La 2 O 3 Stir and mix with 29g of cerium-zirconium composite oxide, take 2.67g of palladium nitrate solution with a concentration of 17.91%, slowly add dropwise to the slurry after dilution, and stir for 24 hours; after stirring, add 1.4g of binder and stir for 60min, Adjust the pH to 4, add 18g of water and then ball mill for 50min, and add the Pd layer slurry;

[0045] After dissolving 1.4g zirconium nitrate and 1.0g praseodymium nitrate in 60g water, add 15g γ-Al modified by La 2 O 3 Stir and mix 23g of cerium-zirconium composite oxide evenly, take 0.56g of rhodium nitrate solution with a concentration of 9.47%, slowly add dropwise to the slurry after dilution, and stir for 24 hours; after stirring, add 1.1g of binder and stir for 60min, Adjust the pH to 4, add 16 g of water and then ball mill for 50 minutes to obtain Rh layer slurry.

[0046] The honeycomb specificat...

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 invention relates to a three-way catalyst for treatment of tail gas of an automobile. The three-way catalyst is prepared from the following components of an oxygen storage material, modified gamma-Al2O3 (aluminum oxide), a rare earth additive, an adhesive, and noble metal nitrate, wherein the modified gamma-Al2O3 is La (lanthanum)-modified gamma-Al2O3; the oxygen storage material is cerium-zirconium composite oxide; the weight ratio of oxygen storage material to modified gamma-Al2O3 is 2:3 to 3:2; the rare earth additive comprises one or multiple of nitrates of zirconium, praseodymium, neodymium and yttrium, and the amount of rare earth additive is equal to 1 to 5% of the total weight of the coating. The three-way catalyst has the advantages that in the coating preparation process, thenoble metal salt solution is firstly thinned, then added, and stirred, and stays overnight, so as to effectively inhibit the agglomeration of noble metals, improve the dispersion degree of noble metals, and improve the utilization rate of the noble metals; the low-temperature drying is adopted, so as to avoid the agglomeration of active components due to transfer of active components in the quickdrying process, and avoid the sintering in the roasting process; the usage amount of noble metals is reduced.

Description

Technical field [0001] The invention relates to automobile tail gas treatment, in particular to a three-way catalyst for automobile tail gas treatment and a preparation method thereof. Background technique [0002] In recent years, the number of cars in my country has gradually increased, bringing convenience to mankind, and the large amount of car exhaust emissions have also brought pollution that cannot be ignored. After the car is started, due to incomplete fuel combustion or high temperature, a large amount of CO, HC and NOx will be produced. These pollutants seriously harm the ecological environment and human health. Therefore, it is necessary to urgently solve the problem of automobile exhaust pollution. [0003] At present, the most effective way to deal with automobile exhaust is to install automobile exhaust purifiers. The key technology is the preparation of three-way catalysts. Three-way catalysts usually use ceramic honeycomb as the substrate, coated with activated al...

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 Applications(China)
IPC IPC(8): B01J23/63B01J35/10B01J37/02B01J37/08B01D53/94
CPCB01D53/945B01J23/63B01J37/0018B01J37/0215B01J37/088B01D2255/908B01J35/60Y02A50/20Y02T10/12
Inventor 唐宇星王金波陈杰李俊强谭涛
Owner CHONGQING BRILLIANT TIGER CATALYTIC
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