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Multifunctional composite oxides powder body and method for using the powder body to prepare catalyst for motor vehicle exhausting gas purification

A composite oxide, multi-functional technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems that functional materials are difficult to achieve uniform mixing, affect the effect, etc., to simplify the preparation process and technology. , Not easy to agglomerate and aging, easy to disperse and uniform effect

Inactive Publication Date: 2009-12-09
北京英泰世纪环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the preparation conditions, it is difficult to achieve uniform mixing of functional materials in the preparation of the coating, which affects its effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First prepare the multifunctional composite oxide powder P0:

[0028] Step 1. Weigh active alumina Al 2 o 3 100~120g, barium carbonate BaCO 3 200-250g, 180-200g of lanthanum, yttrium, cerium and zirconium solid solution, 65-85g of ZSM-5 molecular sieve and 220g of deionized water are put into an agate ball mill jar and ground for 1.5 hours to make slurry C0. The lanthanum, yttrium, cerium and zirconium solid solution used is La 0.08 Y 0.04 Ce 0.31 Zr 0.6 o 2 .

[0029] Step 2. Pour the above slurry C0 into a high-energy ball mill, add 20g of self-made surfactant SURF23, and ball mill it to a particle size of 0.8-1 μm to make slurry C1; the SURF23 is a mixture of various organic surfactants , the main ingredients include polyethylene glycol 400, lignocellulose and starch, etc., and the main functions are water reduction, dispersion and grinding aid.

[0030] Step 3. Quickly spray-dry the slurry C1, and lightly burn it at 450° C. for 1.5 hours to obtain the requi...

Embodiment 2

[0037] First prepare the multifunctional composite oxide powder P0:

[0038] Step 1. Weigh 100-120g of activated alumina, 100-150g of barium carbonate, 100-120g of lanthanum, yttrium, cerium and zirconium solid solution, 95-105g of ZSM-5 molecular sieve and 230g of deionized water, put them into a ball mill jar, and grind for 1.5 hours to form Slurry C0, the lanthanum yttrium cerium zirconium solid solution used is La 0.08 Y 0.04 Ce 0.6 Zr 0.31 o 2 .

[0039] Step 2. Pour the above slurry C0 into a high-energy ball mill, add 20 g of the self-made surfactant SURF23 as described in Example 1, and ball mill until the particle size is about 0.5 μm to make slurry C1.

[0040] In step 3, the slurry C1 is rapidly spray-dried, and then lightly fired at 450° C. for 1.5 hours to obtain the required multifunctional composite oxide powder P0.

[0041] Then utilize the prepared multifunctional composite oxide powder P0 to prepare a catalyst for purifying motor vehicle exhaust:

[00...

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PUM

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Abstract

The invention provides a multifunctional composite oxide powder capable of simultaneously adsorbing and storing NOx, HC and O2 and a method for preparing a catalyst for exhaust purification of motor vehicles by using the powder. The preparation steps of the powder are: (1) take activated alumina, barium carbonate, lanthanum yttrium cerium zirconium solid solution, molecular sieve and deionized water, and grind into slurry CO; (2) slurry CO and surfactant, Ball milling into slurry C1; (3) Dry the slurry C1 and lightly burn it. The steps for preparing the catalyst are: (1) Weighing pseudo-boehmite, deionized water and acetic acid, and dissolving it into C2; (2) stirring the slurry C2, multifunctional composite oxide powder and deionized water at high speed , homogenized, and mixed to make slurry C3; (3) soak the honeycomb carrier in the slurry C3, and after hanging the slurry, dry and roast to obtain the catalyst coating; (4) load the precious metal active component on the catalyst coating After the layer is on, lightly burn. The multifunctional composite oxide powder of the invention is not easy to agglomerate and age, is easy to disperse evenly, and has a high specific surface area.

Description

technical field [0001] The invention relates to a device that can simultaneously absorb and store NO x , HC and O 2 A multifunctional composite oxide powder and a method for preparing a catalyst for exhaust purification of motor vehicles using the powder. Background technique [0002] In order to better protect the environment, emission regulations are becoming more and more stringent, and the requirements for engine and vehicle cold start emission limits are also getting higher and higher. Objectively, catalysts are required to: 1. have better HC adsorption and storage functions, and Reduce the HC emissions of the engine under cold start conditions; 2. Better NO x Adsorption and storage function, increase the catalyst's ability to react to NO under lean burn conditions x The adsorption and storage capacity of NO x 3. It has a better ability to absorb and store oxygen, ensuring that the catalyst is effective against HC and NO under the condition of the engine air-fuel ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01D53/94
Inventor 刘耀军王大祥潘陆陆
Owner 北京英泰世纪环境科技有限公司
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