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Composite carrier of exhaust gas cleaning catalyst and preparation method of carrier

A technology for composite carrier and tail gas purification, which is applied in the direction of catalyst carrier, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of high cost and unsuitability for industrial production, and achieve improved stability, large specific surface area and pores Content effect

Inactive Publication Date: 2013-03-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alumina precursors of the above two patents both use soluble aluminum salts, which are expensive and not suitable for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A method for preparing a composite carrier of an exhaust gas purification catalyst, the specific implementation steps are as follows:

[0022] (1) React aluminum hydroxide and sodium hydroxide to form sodium aluminate solution, use dilute sulfuric acid for co-precipitation titration, age, filter and wash to obtain macroporous pseudo-boehmite, filter cake with pure water Dubbed into a slurry with a certain solid content.

[0023] (2) Take cerium nitrate and zirconium nitrate solutions, mix them in a certain proportion, then add a certain amount of hydrogen peroxide, put them in a container and stir well.

[0024] (3) Co-precipitate and titrate the precipitant and the salt solution in step 2 into the pseudo-boehmite slurry prepared in step 1 for precipitation, and control the pH value between 8-10 to obtain the precipitate .

[0025] (4) Suction filter the precipitate obtained in step 3, wash the filter cake three times with pure water, then dry it, and roast it at a ce...

Embodiment 1

[0032] This embodiment is a method for preparing pseudo-boehmite, which is applicable to Examples 2-5.

[0033] Add 4L of pure water into the autoclave reactor, pour 2kg of solid sodium hydroxide, stir to dissolve it, put in 2.9kg of industrial aluminum hydroxide, cover the kettle, stir, heat to 140°C for 4h, stop heating, Cool down to 80 degrees, filter to obtain pure sodium aluminate solution, the concentration is 725g / l. Dilute the sodium aluminate solution to 100g / l, then co-precipitate with 25% dilute sulfuric acid into a fixed reaction tank, control the pH value to 8.5, age at 80°C for 4h after the reaction is completed, filter with suction, and wash to obtain the proposed Boehmite filter cake, set aside.

Embodiment 2

[0035] Take 1 / 10 of the filter cake in Example 1, mix and stir with 2L pure water to form a slurry. Get 239.8g cerium nitrate, 248.9g zirconium oxychloride and dissolve in pure water, the solution concentration is 100g / l. Then add 30ml of 30% hydrogen peroxide and stir well. The buffer solution of ammonia water and ammonium bicarbonate and the above salt solution were co-precipitated and titrated into the reaction tank containing the pseudo-boehmite slurry, the pH value was controlled at 9, and the mixture was aged at 80°C for 3 hours. Vacuum suction filtration, washing with pure water three times until the filtrate is neutral, mixing the resulting filter cake with 2L of 5% polyethylene glycol solution for beating, spray drying at 110°C, and roasting in a muffle furnace at 600°C for 3h, Obtain composite tail gas catalyst carrier, mass ratio CeO 2 : ZrO 2 :Al 2 o 3 1:1:2, marked as CZA1; aging CZA1 in a high-temperature furnace at 1000°C for 12 hours, marked as ACZA1.

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Abstract

The invention discloses a composite carrier of an exhaust gas cleaning catalyst and a preparation method of the carrier, and relates to the preparation method of a composite material for cleaning and catalyzing automobile exhaust. The composite carrier is characterized by comprising the components of 34-75% of aluminum oxide, 12.5-35% of cerium oxide and 12.5-31% of zirconium oxide. The preparation process comprises the steps of: preparing a pseudo-boehmite base material by a sodium aluminate solution sulfuric acid neutralization method, and then merging and precipitating cerium-zirconium mixed soluble salt solution and a precipitator on the surface of the pseudo-boehmite base material, thus obtaining the composite carrier material which is large in specific surface area, and good in oxygen storage capacity, and has the capability of keeping high specific surface area and high oxygen storage capacity stability at high temperature by aging, drying and roasting, wherein the specific surface area can be up to 113m<2> / g after sintering for 12 hours at 1000 DEG C. The preparation method is simple in production process, and the prepared composite carrier material has excellent property and can be used as a coating carrier of a high-performance exhaust catalyst.

Description

technical field [0001] The invention relates to a composite carrier of an exhaust gas purification catalyst and a preparation method thereof, and relates to a preparation method of a composite material used for automobile exhaust purification and catalysis. Background technique [0002] Automobile exhaust is one of the main causes of air pollution, which has attracted great attention from all countries in the world, and invested a lot of money, technology and manpower to control it. Automobile exhaust gas purification catalysts are being widely used as environmental protection catalysts. With the increasingly stringent emission regulations of various countries, the requirements for such catalysts are also getting higher and higher, and all vehicles are allowed to be put into the market only after their exhaust emissions meet the standards. [0003] There are two types of key materials used in automobile exhaust catalysts: high temperature stable activated alumina and rare e...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/10B01D53/94
Inventor 宋为聪刘永鹤王建立刘明珠李东红
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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