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Back segment coating of ternary catalyst for purifying automobile exhaust

A three-way catalyst, automobile exhaust technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve problems such as price increases and reduce fuel consumption. , The effect of reducing production cost and reducing exhaust back pressure

Inactive Publication Date: 2016-05-04
重庆海特汽车排气系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the one hand, the increasingly stringent emission regulations require the three-way catalyst to have higher catalytic activity and heat aging resistance; on the other hand, the competition in the automobile market is becoming more and more fierce, and the cost pressure is increasing. However, the preparation of the three-way catalyst The rising prices of raw materials, active components, precious metals, etc. have brought great cost pressure to three-way catalyst enterprises. , a low-cost three-way catalyst that can simultaneously treat carbon monoxide, hydrocarbons, and nitrogen oxides in automobile exhaust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of the front-end coating: impregnate 30g / L of alumina and 10g / L of cerium-zirconium composite oxide with a palladium nitrate solution containing 2.5g / L of palladium. The alumina contains La with a content of 3wt%. The cerium-zirconium The composite oxide contains La and Y in parts by weight, wherein Ce:Zr:La:Y=4:5:0.5:0.5. Immerse 20g / L of cerium-zirconium composite oxide with rhodium nitrate solution containing 0.15g / L of rhodium. The cerium-zirconium composite oxide contains La and Y in parts by weight, wherein Ce:Zr:La:Y=2:7 :0.5:0.5. The impregnated Pd loading material and Rh loading material were mixed and ball-milled to a particle size of 3 μm to make a front-end coating slurry, and the slurry was coated on the front section of the carrier, dried at 100°C for 4 hours, and fired at 500°C for 2 hours.

[0020] Preparation of the back-stage coating: 40 g / L of alumina is impregnated with a palladium nitrate solution containing 0.4 g / L of palladium, and th...

Embodiment 2

[0022] Preparation of the front-end coating: 50 g / L of alumina is impregnated with a palladium nitrate solution containing 2.8 g / L of palladium, and the alumina contains La with a content of 3 wt%. Immerse 20g / L of cerium-zirconium composite oxide with a rhodium nitrate solution containing 0.1g / L of rhodium. The cerium-zirconium composite oxide contains La and Nd in parts by weight, wherein Ce:Zr:La:Nd=2:7.35 :0.15:0.5. The impregnated Pd loading material and Rh loading material were mixed and ball-milled to a particle size of 3 μm to make a front-end coating slurry, and the slurry was coated on the front section of the carrier, dried at 100°C for 4 hours, and fired at 500°C for 2 hours.

[0023] Preparation of the back-stage coating: 40 g / L of alumina is impregnated with a palladium nitrate solution containing 0.5 g / L of palladium, and the alumina contains La at a content of 3 wt%. Use rhodium 0.1g / L rhodium nitrate solution to impregnate 30g / L cerium-zirconium composite oxi...

Embodiment 3

[0025] Preparation of the front-end coating: impregnate 20g / L of alumina and 5g / L of cerium-zirconium composite oxide with palladium nitrate solution containing 2.2g / L of palladium, the alumina contains La with a content of 3wt%, and the cerium-zirconium The composite oxide contains La and Y in parts by weight, wherein Ce:Zr:La:Y=3.5:5.5:0.5:0.5. Impregnate 15 g / L of cerium-zirconium composite oxide with rhodium nitrate solution containing 0.18 g / L of rhodium. The cerium-zirconium composite oxide contains La in parts by weight, wherein Ce:Zr:La=2.2:7.3:0.5. The impregnated Pd loading material and Rh loading material were mixed and ball-milled to a particle size of 2 μm to make a front-end coating slurry, and the slurry was coated on the front section of the carrier, dried at 110°C for 4 hours, and fired at 550°C for 2 hours.

[0026] Preparation of the back-stage coating: 40 g / L of alumina is impregnated with a palladium nitrate solution containing 0.3 g / L of palladium, and th...

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Abstract

The invention provides a back segment coating of a ternary catalyst for purifying automobile exhaust. The back segment coating is loaded on a back segment using Iolite cellular ceramic as a carrier, the back segment comprises active aluminum oxide and one cerium-zirconium composite oxide, palladium is loaded on active aluminum oxide, and rhodium is loaded on the cerium-zirconium composite oxide. A ternary catalyst which is composed of the back segment coating and a front segment coating has the advantages of good low-temperature light-off performance, good heat aging resistance and durability, and low cost; the ternary catalyst is used for treating carbon monoxide, hydrocarbon and oxynitride in automobile exhaust at the same time.

Description

technical field [0001] The invention relates to a catalyst for purifying automobile tail gas, in particular to a three-way catalyst capable of simultaneously treating carbon monoxide, hydrocarbons and nitrogen oxides in automobile tail gas. Background technique [0002] Automobile exhaust contains many harmful substances, mainly including: unburned hydrocarbons in gasoline, carbon monoxide produced by incomplete combustion, and nitrogen oxides converted under high oxygen-enriched conditions. Reducing the emission of harmful substances in automobile exhaust is an important issue that human beings must solve. At present, the most effective way to control vehicle exhaust pollution is to reduce the emission of a single vehicle, and use a conversion device to convert harmful components into harmless gases. The most commonly used purifier is a three-way purifier, which converts carbon at the same time near the theoretical air-fuel ratio. Hydrogen compounds, carbon monoxide and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01D53/94B01D53/62B01D53/56B01D53/72
CPCB01D53/925B01D53/9413B01D2255/1023B01D2255/1025B01D2255/2065B01D2255/20715B01D2255/2092B01D2257/404B01D2257/502B01D2257/702B01J23/002B01J23/44B01J23/464B01J2523/00B01J2523/31B01J2523/3712B01J2523/48Y02A50/20
Inventor 周波
Owner 重庆海特汽车排气系统有限公司
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