A kind of preparation method of automobile exhaust catalyst

A technology for automobile exhaust gas and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor stability and poor catalytic performance of PTO, and achieve Good lubricity, active redox performance, improved activity

Active Publication Date: 2018-04-24
柳州永安行汽车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing single-component PTO has poor catalytic performance and poor stability, and cannot meet the increasingly severe automobile exhaust pollution.

Method used

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Examples

Experimental program
Comparison scheme
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preparation example Construction

[0019] A preparation method for an automobile exhaust catalyst, comprising the following steps:

[0020] First, mix zirconia, cerium oxide and nickel powder according to the mass fraction and ball mill for 30-50 hours, then add alumina and continue ball milling for 20-40 hours to obtain a composite powder, in which zirconia accounts for 4-8wt%, and cerium oxide accounts for 15-20wt% , nickel accounts for 2-4wt%, and the balance is alumina; in the ball milling process, the speed of 180-220r / min is used, and the ball-to-material ratio of (9-10):1 is used, so that nano-scale composite powder can be obtained. During the ball milling process, due to the stress-induced allotropic phase transition of alumina ball milling, the generated α-Al 2 o 3 It is not good for catalytic performance, so it should be milled after ball milling zirconia, cerium oxide and nickel powder; and nickel powder has a strong cold welding effect in the early stage of ball milling, so it should be mixed with ...

Embodiment 1

[0024] Mix zirconia, cerium oxide and nickel powder according to the mass fraction, use the speed of 180r / min, ball-to-material ratio of 9:1 ball mill for 30h, then add alumina and continue the ball milling time for 20h to obtain a composite powder, in which zirconia accounts for 4wt% , cerium oxide accounts for 15wt%, nickel accounts for 2wt%, and the balance is alumina; then the composite powder is prepared into a slurry with deionized water, and then the pretreated cordierite carrier is immersed in the slurry, and taken out after about 1min. And blow off the excess slurry in the channel, after drying, immerse in the slurry for 1min, then dry at 130°C for 3h, and bake at 600°C for 1h; after the slurry is coated, immerse the carrier in 1g / L palladium chloride ammonia solution , magnetically stirred for 4 hours, then removed, blown off excess solution, dried in the air, dried at 120°C for 4 hours, roasted at 500°C for 2 hours, cooled; then immersed the carrier in potassium boro...

Embodiment 2

[0026] Mix zirconia, cerium oxide and nickel powder according to the mass fraction, use the speed of 200r / min, ball-to-material ratio of 10:1 ball mill for 40h, then add alumina and continue the ball milling time for 30h to obtain a composite powder, in which zirconia accounts for 6wt% , cerium oxide accounts for 18wt%, nickel accounts for 3wt%, and the balance is alumina; then the composite powder is prepared into a slurry with deionized water, and then the pretreated cordierite carrier is immersed in the slurry, and taken out after about 1min. And blow off the excess slurry in the channel, after drying, immerse in the slurry for 1min, then dry at 130°C for 3h, and bake at 600°C for 1h; after the slurry is coated, immerse the carrier in 1g / L palladium chloride ammonia solution , magnetically stirred for 4 hours, then removed, blown off excess solution, dried in the air, dried at 120°C for 4 hours, roasted at 500°C for 2 hours, cooled; then immersed the carrier in potassium bor...

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Abstract

The invention relates to an automobile exhaust catalyst, in particular to a preparation method of the automobile exhaust catalyst. The preparation method comprises the following steps: performing mixing and ball mixing on the following components in percentage by mass: zirconium oxide, cerium oxide and nickel powder, adding alumina powder, and performing continuous ball milling so as to obtain composite powder; preparing the composite powder into pulp with deionized water, performing immersing, drying and roasting on carriers, and performing immersing in a palladium chloride ammonia solution; performing taking out, drying, roasting and cooling; immersing the carriers in a potassium borohydride solution, performing a reaction, and then performing washing with the deionized water; then immersing the carriers in a solution prepared from palladium chloride, an ammonia solution, EDTA, hydrazine hydrate and deionized water, and then performing taking out, washing and drying. According to the automobile exhaust catalyst disclosed by the invention, ball milling is performed, so that catalyst powder granules are refined, and the grain size achieves a nanometer level. Besides, noble metals are replaced with transition metal namely nickel, and because nickel has a plurality of oxidation states, the automobile exhaust catalyst has active oxidation-reduction properties. Therefore, the activity of the obtained catalyst is improved, and besides, the cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to an automobile exhaust catalyst, in particular to a preparation method of an automobile exhaust catalyst. Background technique [0002] With the increase of car ownership, the CO, HC and NO emitted by cars into the atmosphere X more and more. At present, many countries have adopted strict emission control measures on vehicle exhaust emissions. Therefore, the treatment of automobile exhaust has become an important issue day by day. In the prior art, the control of automobile exhaust emission is realized by adding a catalytic converter, and the key of the catalytic converter is the catalyst. Catalysts usually adopt a three-layer structure consisting of active components, washcoat and carrier. Since the rare earth perovskite oxide (PTO) was used in exhaust gas catalysis, because its A and B sites can be replaced to generate oxygen vacancies, and at the same time, this type of catalyst has a greater price advantage over noble me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89
CPCB01J23/894
Inventor 钟静清韦晗
Owner 柳州永安行汽车科技有限公司
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