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Automobile exhaust purifying catalyst and preparation method thereof

A technology for purifying catalysts and automobile exhaust. It is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of poor high-temperature anti-aging performance and high ignition temperature, and achieve excellent aging resistance. Satisfies emission requirements and has good low-temperature ignition activity

Active Publication Date: 2009-12-16
常熟华虞环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as CN1010282, CN1803263, CN100998941, etc., the catalysts invented by these patents have the characteristics of wide air-fuel ratio range, good catalytic activity, and good anti-poisoning ability, but there are also defects such as high light-off temperature and poor high-temperature anti-aging performance

Method used

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  • Automobile exhaust purifying catalyst and preparation method thereof
  • Automobile exhaust purifying catalyst and preparation method thereof

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preparation example Construction

[0025] The preparation method of above-mentioned catalyst that the embodiment of the present invention provides, comprises the following steps:

[0026] (1) Loading the soluble salt solution of rhodium in the oxygen storage material in the form of impregnation, drying and roasting to obtain the rhodium-modified oxygen storage material;

[0027] (2) Loading activated alumina in the form of impregnation with a soluble salt solution of palladium, drying and roasting to obtain palladium-modified alumina;

[0028] (3) The prepared rhodium-modified oxygen storage material and palladium-modified alumina are respectively mixed with water and a binder and ball-milled to 1-10 μm to make the first layer and the second layer of coating slurry;

[0029] (4) Coating the coating slurry of the first layer and the second layer on the catalyst carrier in sequence, drying and calcining to obtain the catalyst.

[0030] In the preparation method provided by the present invention, the drying steps...

Embodiment 1

[0037] This example is used to illustrate the automobile exhaust purification catalyst provided by the present invention and its preparation method.

[0038] Impregnate 60 g of cerium-zirconium solid solution with rhodium-containing 0.15 g of rhodium chloride solution, the cerium-zirconium solid solution is in parts by weight, wherein Ce: Zr=4:6, and then dried at 100 ° C for 6 h and roasted at 600 ° C for 2 h to obtain rhodium modified Oxygen storage material; 100g of activated alumina is impregnated with palladium chloride hydrochloric acid solution containing 1.2g of palladium, then dried at 100°C for 6h and calcined at 600°C for 2h to obtain palladium-modified alumina. 60g of rhodium-modified oxygen storage material, 80g of activated alumina, 20g of pseudoboehmite and 200g of water were mixed and ball-milled to 3 μm to make an inner coating slurry; 100g of palladium-modified alumina, 30g of oxygen storage material, pseudo-boehmite 30 g of boehmite and 180 g of water were m...

Embodiment 2

[0040] This example is used to illustrate the automobile exhaust purification catalyst provided by the present invention and its preparation method.

[0041] Immerse 80 g of cerium-zirconium solid solution with rhodium-containing 0.2 g of rhodium trichloride solution, which contains La, in parts by weight, where Ce: Zr: La=3:6:1, and then dried at 110 ° C for 4 h, 550 Roasting at ℃ for 4 hours to obtain a rhodium-modified oxygen storage material; impregnating 120g of activated alumina with palladium chloride hydrochloric acid solution containing 2g of palladium, then drying at 110℃ for 4h and calcining at 550℃ for 4h to obtain palladium-modified alumina. Mix 80g of rhodium-modified oxygen storage material, 80g of activated alumina, 20g of pseudoboehmite, 10g of barium nitrate and 220g of water and ball mill to 3μm to make an inner coating slurry; 120g of palladium-modified alumina, oxygen storage 30g of materials, 30g of pseudo-boehmite, 10g of barium nitrate and 240g of water...

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Abstract

The invention provides an automobile exhaust purifying catalyst and a preparation method thereof. Honeycomb ceramics are used as a carrier, activated aluminum oxide and an oxygen storage material are used as a coating, noble metals of palladium and rhodium are used as activated components of the catalyst; the coating is of a double-layered structure, wherein a first-layer load is loaded on the carrier, and contains the activated aluminum oxide and the oxygen storage material; a second-layer load is loaded on the first coating and contains the activated aluminum oxide along with or without the oxygen storage material; the activated components of the noble metals of palladium and rhodium are respectively loaded on different materials; a metal and / or oxide load of rhodium is loaded on the first-layer oxygen storage material, and a metal and / or oxide load of palladium is loaded on the second-layer activated aluminum oxide. The automobile exhaust purifying catalyst has the advantages of good low-temperature combustion activity and good anti-aging performance and can satisfy the requirement for low emission.

Description

technical field [0001] The invention belongs to the technical field of environmental protection catalysts, in particular to a catalyst for purifying automobile exhaust and a preparation method thereof. Background technique [0002] The core part of the automobile exhaust catalytic converter is the catalyst. Its working principle is to use the residual oxygen in the exhaust gas and the high temperature of the exhaust gas to carry out oxidation-reduction reaction on the surface of the catalyst to make harmful substances CO, hydrocarbons (HC) and NOx into non-toxic CO 2 、H 2 O and N 2 , thereby reducing environmental pollution. The most widely used automobile exhaust catalyst can carry out reduction and oxidation reactions at the same time, and is a three-way catalyst (TWC) that can purify harmful gases HC, NOx and CO in automobile exhaust. With the increasing improvement of my country's automobile exhaust emission regulations, the control of automobile exhaust emissions is...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/89B01J37/025B01D53/94
Inventor 周波方伟刘武略翟江茹王胜杰
Owner 常熟华虞环境科技有限公司
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