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
View PDF3 Cites 48 Cited by
  • 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 catalyt

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automobile exhaust purifying catalyst and preparation method thereof
  • Automobile exhaust purifying catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] The preparation method of the above-mentioned catalyst provided by the embodiment of the present invention includes the following steps:

[0026] (1) Load the oxygen storage material with a soluble rhodium salt solution in a manner of impregnation, and dry and roast to obtain a rhodium modified oxygen storage material;

[0027] (2) Load in activated alumina by impregnation with palladium soluble salt solution, dry and roast to obtain palladium modified alumina;

[0028] (3) Ball mill the prepared rhodium-modified oxygen storage material and palladium-modified alumina, respectively, with water and a binder to a thickness of 1-10 μm to prepare the first layer and the second layer coating slurry;

[0029] (4) The first layer and the second layer coating slurry are sequentially coated on the catalyst carrier, dried and calcined to obtain the catalyst.

[0030] In the preparation method provided by the present invention, the drying steps are all carried out at 85-130°C, and the ...

Example Embodiment

[0036] Example 1

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

[0038] 60g of cerium-zirconium solid solution was impregnated with a rhodium trichloride solution containing 0.15g of rhodium. The cerium-zirconium solid solution was in parts by weight, in which Ce:Zr=4:6, and then dried at 100°C for 6h and roasted at 600°C for 2h to prepare rhodium Oxygen storage material: 100g activated alumina is impregnated with 1.2g palladium chloride hydrochloric acid solution containing palladium, and then dried at 100°C for 6 hours and calcined at 600°C for 2 hours to prepare palladium-modified alumina. Mix 60g of rhodium-modified oxygen storage material, 80g of activated alumina, 20g of pseudo-boehmite and 200g of water to 3μm to form 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...

Example Embodiment

[0039] Example 2

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

[0041] 80g of cerium-zirconium solid solution was impregnated with 0.2g rhodium trichloride solution containing La in parts by weight, where Ce:Zr:La=3:6:1, and then dried at 110°C for 4h, 550 The rhodium-modified oxygen storage material was calcined at °C for 4 hours to prepare the rhodium-modified oxygen storage material; 120 g of activated alumina was impregnated with a palladium chloride hydrochloric acid solution containing 2 g of palladium, and then dried at 110 °C for 4 hours and calcined at 550 °C for 4 hours to prepare palladium-modified alumina. The rhodium-modified oxygen storage material 80g, activated alumina 80g, pseudo-boehmite 20g, barium nitrate 10g and water 220g are mixed and ball milled to 3μm to make the inner coating slurry; 120g palladium-modified alumina, oxygen storage 30 g of materials...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap