Preparation technology of catalyst for purification of motor vehicle exhaust

A preparation process and exhaust gas purification technology, which is applied in the field of catalyst preparation process for motor vehicle exhaust purification, can solve the problems of less production process reports, and achieve the effects of improving utilization, stability, and consistency

Inactive Publication Date: 2015-12-30
ZHEJIANG DA FENG AUTOMOBILE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many units researching and producing motor vehicle exhaust purifiers at home and abroad, and there are many research pa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A catalyst preparation process for purifying motor vehicle exhaust, comprising the following steps:

[0029] (1) Add deionized water into stirring tanks 1, 2, and 3 respectively, then add glacial acetic acid respectively, and stir evenly to obtain an acid solution, the pH of which is 3;

[0030] (2) Add the powder material A into the stirring tank 1 at a speed of 60Kg / h, and stir while adding the powder material. After the powder material is added, continue to stir at a stirring rate of 300 rpm / min for 3.5 hours to obtain the slurry A; the powder material A The ratio of the water added to the stirred tank 1 is 1:3; the powder A is a rare earth composite oxide, modified alumina and a binder;

[0031] (3) Add the powder B into the stirring tank 2 at a speed of 20Kg / h, and stir while adding the powder. After the powder is added, continue to stir at a stirring rate of 1000 rpm for 1 hour to obtain the slurry B. The powder B is mixed with The ratio of water added in the sti...

Embodiment 2

[0038] A catalyst preparation process for purifying motor vehicle exhaust, comprising the following steps:

[0039] (1) Add deionized water into stirring tanks 1, 2, and 3 respectively, then add nitric acid respectively, and stir evenly to obtain an acid solution, the pH of which is 1;

[0040] (2) Add powder A to stirring tank 1 at a speed of 100Kg / h, and stir while adding. After the powder is added, continue to stir at a stirring rate of 600 rpm for 4 hours to obtain slurry A; powder A and The ratio of water added in the stirred tank 1 is 1:2; the powder A is a rare earth composite oxide, an additive, a rare earth oxide additive, and a binder;

[0041] (3) Add the powder B into the stirring tank 2 at a speed of 80Kg / h, and stir while adding the powder. After the powder is added, continue to stir at a stirring rate of 600 rpm for 3 hours to obtain the slurry B, and the powder B and The ratio of water added in the stirred tank 2 is 1:2; the powder B is silicon-aluminum compos...

Embodiment 3

[0048] A catalyst preparation process for purifying motor vehicle exhaust, comprising the following steps:

[0049] (1) Add deionized water into stirring tanks 1, 2, and 3 respectively, then add glacial acetic acid and nitric acid respectively, and stir evenly to obtain an acid solution, the pH of which is 6;

[0050] (2) Add powder A to stirring tank 1 at a speed of 50Kg / h, and stir while adding. After the powder is added, continue to stir at a stirring rate of 1000 rpm for 1 hour to obtain slurry A; powder A and The ratio of water added in the stirred tank 1 is 5:3; the powder A is a rare earth composite oxide, modified alumina, and a binder;

[0051] (3) Add the powder B into the stirring tank 2 at a speed of 100Kg / h, and stir while adding the powder. After the powder is added, continue to stir at a stirring rate of 100 rpm for 5 hours to obtain the slurry B. The powder B is mixed with The ratio of water added in the stirred tank 2 is 1:1; the powder B is silicon-aluminum ...

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Abstract

The invention relates to a preparation technology of a catalyst for purification of motor vehicle exhaust. The preparation technology comprises the following steps: (1) preparing an acid liquid; (2), preparing slurry A; (3), preparing slurry B; (4), preparing slurry C; (5) preparing primary slurry; (6), preparing catalyst slurry; (7), coating a carrier. According to matching of different precious metal loaded materials, separate loading is performed, the utilization rate of precious metal is increased, the precious metal realizes the maximum effect on each material, the precious metal components are completely adsorbed, the slurry stability is improved, matching of the coating, the coating amount and the coating technology is realized, and the product consistency is improved; the technology is simplified, the disqualified rate is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a catalyst preparation process for purifying motor vehicle tail gas, belonging to the technical field of motor vehicle tail gas purification. Background technique [0002] At present, the total number of motor vehicles in the world is about 600 million. The forecast shows that motor vehicles will continue to grow in the next 30 years, and the total number of motor vehicles in the world will exceed the 1 billion mark in 2020-2030. While automobiles bring convenience to people's travel, the automobile exhaust causes huge pollution to the atmospheric environment. People pay more and more attention to the air pollution caused by motor vehicle exhaust emissions. Many countries have formulated various laws and regulations and adopted many measures, including administrative and technical means, to strictly control the exhaust pollution of automobiles. Emission standards are mainly formulated for the emission of three substances: HC, ...

Claims

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Application Information

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IPC IPC(8): B01J23/63
Inventor 李光凤王磊王秋艳沈一泽张汉浪
Owner ZHEJIANG DA FENG AUTOMOBILE TECH
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