Automobile exhaust gas purifying catalyst preparation method

A technology for purifying catalysts and automobile exhaust, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Through micropores and other problems, the effects of simple process, high specific surface area, and good oxygen storage and release capacity are achieved.

Inactive Publication Date: 2016-05-25
重庆海特汽车排气系统有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, multi-layer coating leads to the uncontrollable distribution position and state of most active components, and the active components inside the coating are not conducive to being fully utilized, and multi-layer coating prolongs the production cycle
[0005] In the existing catalyst coating preparation process, the main active component noble metal elements are loaded on the inside and surface of the carrier material. If the noble metal is attached to the surface of the carrier at a high temperature, it is very easy to sinter and agglomerate and deactivate; if the noble metal is loaded inside the carrier material , because there are few micropores inside the carrier material that can be used for gas diffusion, it is difficult for harmful gas to reach the precious metal inside the carrier material through the micropores.
Due to the lack of effective catalytic active sites and low utilization rate of the catalyst prepared by the existing preparation method, the tail gas treatment effect is not good

Method used

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Embodiment Construction

[0020] Preferred embodiments of the present invention are described in detail below.

[0021] A kind of preparation method of automobile tail gas purification catalyst of the present invention comprises the following steps:

[0022] 1) Mix and stir ethanol, deionized water, and citric acid to form a solution I;

[0023] 2) Combine the soluble salt of cerium with H 2 o 2 mix to make Ce 3+ Oxidized to Ce 4+ , get Ce 4+ Solution II;

[0024] 3) Add Ce and Ce to solution II 4+ The soluble salt solution of zirconium of the same molar ratio, obtains mixed solution III;

[0025] 4) Add solution III to solution I, and heat and stir to form solution IV;

[0026] 5) A soluble salt solution of noble metal elements (Pt, Pd, Rh) and a nonionic surfactant are uniformly mixed to form a solution V, and then the solution IV is dropped into the solution V to form a solution VI, which is stirred while dropping;

[0027] 6) Evaporate solution VI to dryness and form gel A;

[0028] 7) Th...

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Abstract

The present invention discloses an automobile exhaust gas purifying catalyst preparation method, a noble metal, cerium and zirconium are prepared into a noble-metal-containing cerium-zirconium solid solution by a co-precipitation method, the method is simple in process and easy to control, and the noble-metal-containing cerium-zirconium solid solution obtained by the method has more micropores, high specific surface area and good oxygen storage and release capacity.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for purifying automobile tail gas, in particular to a preparation method of a solid solution catalyst doped with elements cerium, zirconium and precious metal elements. Background technique [0002] With the increase of the number of motor vehicles, carbon monoxide, nitrogen oxides, and hydrocarbons emitted into the atmosphere by motor vehicles have brought great harm to the human environment. At present, the three-way catalyst mainly treats the exhaust gas that is fueled by the purification of gasoline. This three-way catalyst uses alumina with a high specific surface area and cerium-zirconium composite oxide with rich oxygen storage and release capabilities as the carrier, and its active component is noble metal. (Pt, Pd, Rh) and other metal elements, the powder material is prepared by making a cohesive slurry and coating it on a cordierite ceramic honeycomb carrier. [0003] For example, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/10B01D53/86B01D53/62B01D53/56B01D53/72
CPCB01J23/63B01D53/8643B01D53/8668B01D2258/01B01J35/1004
Inventor 刘津
Owner 重庆海特汽车排气系统有限公司
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