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A preparing method of a three-way catalyst

A three-way catalyst and dispersing aid technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can achieve the effect of high utilization rate of precious metals, excellent three-way catalytic activity, and fast light-off.

Active Publication Date: 2016-11-09
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the impregnation height and area are difficult to control when the catalyst is prepared by the traditional impregnation method, and the uneven distribution of the active components makes the catalytic effect poor, and provides a three-way catalyst with simple preparation method and easy operation. Preparation

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] Adopt the preparation process of dipping method of the present invention:

[0031] (1) Preparation of precious metal Pd impregnation solution: Take 1 part of methylcellulose as a dispersing aid, add it to 90 parts of water, stir for 3 hours, then add 8 parts of palladium nitrate solution dropwise, and continue stirring for 3 hours until it is evenly mixed , the viscosity of the dipping solution is 105 centipoise;

[0032] (2) Coating of the first coating slurry: take a blank carrier of φ103*130mm, coat the first coating slurry on it with a coating amount of 120g / L, and dry it in an oven at 150°C for 5h, 500 Roasting at ℃ for 2 hours;

[0033] The components in the first coating slurry are 50 parts by weight of alumina, 30 parts of cerium-zirconium powder, 10 parts of lanthanum nitrate, and 10 parts of cerium nitrate;

[0034] (3) Traditional method of precious metal Pd impregnation: according to the partition ratio of carrier length ratio of 1:1, only the front end is...

Embodiment 2

[0044] A preparation method of a three-way catalyst, characterized in that: comprising the steps of:

[0045] (1) Preparation of precious metal Pd impregnation solution in the front area: Take 1.6 parts of hydroxyethyl cellulose as a dispersing aid, add it to 90 parts of water, stir for 3 hours, then add 8 parts of palladium nitrate solution dropwise, and continue stirring for 2 hours to It is mixed evenly, and the viscosity of the dipping solution is 120 centipoise;

[0046] (2) Preparation of precious metal Pd impregnating solution in the rear area: Take 0.4 parts of polyurethane as a dispersion aid, add it to 94 parts of water, stir for 3 hours, then add 4 parts of palladium nitrate solution dropwise, and continue stirring for 2 hours until it is evenly mixed. The viscosity of the dipping solution is 115 centipoise;

[0047] (3) Coating of the first coating slurry: take a blank carrier of φ103*130mm, apply the first layer of slurry without active components on it according...

Embodiment 3

[0057] A preparation method of a three-way catalyst, characterized in that: comprising the steps of:

[0058] (1) Preparation of precious metal Pd impregnation solution in the front area: Take 2 parts of methylcellulose as a dispersing aid, add it to 89.8 parts of water, stir for 3 hours, then add 10 parts of palladium nitrate solution dropwise, and continue stirring for 2 hours until it reaches its peak. Mix evenly, and the viscosity of the dipping solution is 130 centipoise;

[0059] (2) Preparation of precious metal Pd impregnating solution in the back area: Take 0.2 parts of methylcellulose as a dispersing aid, add it to 96 parts of water, stir for 3 hours, then add 2 parts of palladium nitrate solution dropwise, and continue stirring for 2 hours until it reaches its peak. Mix evenly, the viscosity of the dipping solution is 115 centipoise;

[0060] (3) Coating of the first coating slurry: take a blank carrier of φ103*130mm, coat the first coating slurry on it with a coat...

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Abstract

The invention relates to a preparing method of a three-way catalyst. The method includes preparing a front-zone precious metal solution and a rear-zone precious metal solution, coating a carrier with a first slurry layer with the coating amount being 100-140 g / L, drying, calcinating, dipping the front end of the carrier in 50-300 g of the precious metal solution, dipping the rear end of the carrier in 100-500 g of the precious metal solution, drying in a drying oven having a temperature of 100-150 DEG C for 4-8 h, calcinating at 400-600 DEG C for 1-3 h, coating the carrier with a second slurry layer with the coating amount being 60-100 g / L, drying, and calcinating to obtain the catalyst. The method is simple and easily controllable in steps. Both ends of the carrier are respectively dipped in the precious metal solutions by a dipping manner. Active components are controllable in distribution and mostly distributed on the surface of a pore channel structure. The catalyst is high in catalytic conversion capability and still shows excellent three-way catalytic activity after high-temperature ageing. Compared with traditional three-way catalysts, the catalyst is rapid in ignition, high in precious metal utilization rate and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a three-way catalyst, belonging to the technical field of catalyst preparation. Background technique [0002] With the increase in the number of motor vehicles, their exhaust emissions have become a major source of environmental pollution, seriously affecting people's quality of life. The application of three-way catalysts (purifiers) to catalytically convert gasoline vehicle exhaust is an important method for the prevention and control of motor vehicle exhaust pollutants, and it will be an effective method for a long time in the future. During the development of three-way catalysts, catalyst preparation process technology has always been an important factor affecting catalyst performance. The mixed coating method is currently the mainstream method for producing and preparing honeycomb ceramic catalysts, but special methods are required for special samples, and the impregnation method is one of them. D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/02
CPCB01J23/63B01J37/0203B01J37/0244
Inventor 张云郝士杰蔡晓江吴颖毛冰斌杨金吕衍安王云锋张徐民朱云贾莉伟王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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