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Method for coating motor vehicle exhaust cleaning catalyst

A tail gas purification and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of high cost, complicated process, difficult to use catalyst coating, etc., to achieve low price and easy operation Simple, the effect of reducing the amount of precious metals

Active Publication Date: 2014-08-13
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, the existing noble metal coating methods are costly and complicated, and are difficult to apply to the coating of catalysts in the micropores of wall-flow honeycomb ceramics.

Method used

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  • Method for coating motor vehicle exhaust cleaning catalyst
  • Method for coating motor vehicle exhaust cleaning catalyst
  • Method for coating motor vehicle exhaust cleaning catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example takes the preparation of a single platinum catalyst as an example to illustrate the method for preparing a noble metal catalyst disclosed in the present invention.

[0062] (1) Carrier pretreatment

[0063] The carrier is a wall-flow wall-flow cordierite honeycomb ceramic carrier, purchased from Yixing Prince Pottery Co., Ltd., Φ127×118mm, 200 mesh, crushed, take a 2cm square piece and soak the carrier with 5% nitric acid for 24 hours, and use pure Wash with water, and bake at 90°C for 10 hours. stand-by.

[0064] (2) Carrier sensitization

[0065] Put the carrier treated in step (1) into the sensitization solution, stay for 60min, prepare 250ml sensitization solution, the solvent of the sensitization solution is deionized water and CH at a volume ratio of 1:1 3 OH, the solute is SnCl 2 and C 2 HF 3 o 2 , SnCl 2 The concentration is 22mmol / L, C 2 HF 3 o 2 The concentration is 70mmol / L.

[0066] (3) Carrier activation

[0067] Take out the sensi...

Embodiment 2

[0076] (1) Carrier pretreatment

[0077] The carrier is a wall-flow honeycomb ceramic, which is soaked in 30% nitric acid for 24 hours, washed with pure water, and baked at 120° C. for 10 hours.

[0078] (2) Carrier sensitization

[0079] Put the carrier processed in step (1) into the sensitization solution and stay for 90min. The solvent of the sensitization solution is deionized water and CH at a volume ratio of 1:1. 3 OH, the solute is SnCl 2 and C 2 HF 3 o 2 , SnCl 2 The concentration is 27mmol / L, C 2 HF 3 o 2 The concentration is 80mmol / L.

[0080] (3) Carrier activation

[0081] Take out the sensitized carrier in step (2), rinse it with methanol first, then rinse it with pure water, and then immerse it in the activation solution for 30 minutes. The activation solution is AgNO 3 Dissolve in pure water to make a 40mmol / L solution, and then titrate with 37% ammonia water until the brown silver oxide precipitate disappears, thus obtaining the activation solution. ...

Embodiment 3

[0090] (1) Carrier pretreatment

[0091] The carrier is straight-through honeycomb ceramics, soaked in 5% nitric acid for 24 hours, washed with pure water, and baked at 90°C for 10 hours.

[0092] (2) Carrier sensitization

[0093] Put the carrier processed in step (1) into the sensitization solution and stay for 30min. The solvent of the sensitization solution is deionized water and CH at a volume ratio of 1:1. 3 OH, the solute is SnCl 2 and C 2 HF 3 o 2 , SnCl 2 The concentration is 17mmol / L, C 2 HF 3 o 2 The concentration is 60mmol / L.

[0094] (3) Carrier activation

[0095] Take out the sensitized carrier in step (2), rinse it with methanol first, then rinse it with pure water, and then immerse it in the activation solution and stay for 20 minutes. The activation solution is AgNO 3 Dissolve in pure water to form a 30mmol / L solution, and then titrate with 37% ammonia water until the brown silver oxide precipitate disappears to obtain the activation solution.

[...

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Abstract

The invention provides a method for coating a motor vehicle exhaust cleaning catalyst. The method comprises the following steps: (1) pretreating a carrier; (2) sensitizing the carrier; (3) activating the carrier; and (4) carrying out electroless-deposition. The method for coating the motor vehicle exhaust cleaning catalyst overcomes technical bottlenecks of a traditional impregnation method, a precipitation method, a vacuum coating method and the like, enables the uniform load of precious metal catalysts in wall-flow-type honeycomb ceramic carrier micropores as well as on straight-through-type honeycomb ceramic carrier coatings to be realized successfully; moreover, the precious metal catalysts prepared by the invention have the particle size of 50-100nm, have performances of nano particles, have large specific surface areas, improve the catalytic reaction speed and reaction activities greatly compared with those of great-size catalysts under the same condition; additionally, precious metal salt is used for the method, and is low in price, so that the using quantity of precious metal can be reduced greatly; techniques of high-temperature forging and the like are not required; the method is simple to operate, can be realized, and is wide in carrier application range.

Description

technical field [0001] The invention belongs to the field of air pollution control and environmental protection catalytic materials, and in particular relates to a method for coating a motor vehicle tail gas purification catalyst. Background technique [0002] With the rapid development of the economy, people's demand for motor vehicles is increasing day by day, the production and ownership of domestic motor vehicles have increased sharply, and the problem of motor vehicle exhaust pollution has become more and more serious. Relevant data show that: Beijing, Shanghai, Guangzhou and other big cities , motor vehicle exhaust has become the main source of air pollutants. In particular, diesel engines are gradually becoming the main power of motor vehicles because of their high thermal efficiency, good fuel economy, and long life. However, diesel engine exhaust contains a large amount of nitrogen oxides (NO x ) and particulate matter (PM), especially the emission of particulate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/03B01J23/42B01J23/44B01J23/46
Inventor 聂蓓周秋红王林志郭劲松
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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