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Preparation method for honeycomb ceramic carrier coating

A honeycomb ceramic carrier and coating technology, which is applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of long cycle, complicated process, poor reproducibility, etc., achieve good shock resistance and improve specific surface area. , The effect of improving fluidity and thixotropy

Inactive Publication Date: 2010-04-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for preparing alumina coatings are as follows: ①Using aluminum nitrate or aluminum chloride as the aluminum source, the sol is prepared by the sol-gel method. This process has many control parameters and poor reproducibility, so it is not suitable for industrial production.
②Using activated alumina powder as aluminum source to prepare coating slurry, this method has complex process and long period
This patent studies the addition of different types of pore-forming agents and dispersants in different amounts to increase the specific surface area of ​​the coating, improve the fluidity and thixotropy of the sol, and apply it to the coating material of honeycomb ceramics. There is no report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Using pseudo-boehmite with a solid content of 22% as the aluminum source, stir for 30 minutes, add nitric acid, the molar ratio of acid to aluminum is 0.08, and add 2.07% polyethylene glycol of the pseudo-boehmite mass, and add Urea with 35% of the pseudo-boehmite mass is stirred at high speed for 2 hours to obtain aluminum sol. The pretreated honeycomb ceramic cordierite is immersed in the sol, taken out after 10 minutes, the residual sol is blown out, air-dried, and then dried at 110°C, heated to 500°C at a rate of 1°C / min, and kept for 3h. The modified honeycomb ceramic carrier is obtained. Then sonicate.

Embodiment 2

[0016] Example 2: Using pseudo-boehmite with a solid content of 22% as the aluminum source, stirring for 30 minutes, adding nitric acid, the molar ratio of acid to aluminum is 0.08, adding 0.94% of the pseudo-boehmite mass of polyvinyl alcohol, adding the pseudo-boehmite 40% urea of ​​boehmite mass is stirred at high speed for 4 hours to obtain aluminum sol. The pre-treated honeycomb ceramic cordierite is immersed in the sol, taken out after 5 minutes, the residual sol is blown out, air-dried, and then dried at 110°C, heated to 500°C at a rate of 1.5°C / min, and kept for 4 hours. The modified honeycomb ceramic carrier is obtained. Then sonicate.

Embodiment 3

[0017] Example 3: Using pseudo-boehmite with a solid content of 22% as the aluminum source, stirring for 30 minutes, adding nitric acid, the molar ratio of acid to aluminum is 0.1, and adding 0.19% carboxymethyl cellulose of pseudo-boehmite mass, Add 35% urea of ​​pseudo-boehmite mass and stir at high speed for 4 hours to obtain aluminum sol. The pre-treated honeycomb ceramic cordierite was immersed in the sol, taken out after 3 minutes, the residual sol was blown out, air-dried, and then dried at 80°C, heated to 500°C at a rate of 1°C / min, and kept for 8h. The modified honeycomb ceramic carrier is obtained. Then sonicate.

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Abstract

The invention discloses a preparation method for a honeycomb ceramic carrier coating, which comprises the following steps: using cordierite as a carrier, using polyethylene glycol or polyvinyl alcohol or carboxymethyl cellulose as a pore-forming agent and using urea as a dispersant; at the room temperature, using pseudo-boehmite grout having a solid content of 22 percent as a raw material, adding nitric acid into the raw material, wherein the molar ratio of the nitric acid to the pseudo-boehmite is 0.08 to 0.1, the mass ratio of the pore-forming agent to the pseudo-boehmite is 0.19 to 3 percent and the mass ratio of the dispersant to the pseudo-boehmite is 35 to 50 percent; stirring the mixture at a high speed for 2 to 5h to form alumina sol; and soaking the pre-treated honeycomb ceramic cordierite in the alumina sol to form a modified honeycomb ceramic carrier. The coating material of the invention is suitable for the surface modification of honeycomb ceramics, enables the specific surface area of the honeycomb ceramic carrier to reach 51.18m<2> / g and forms high binding firmness between the coating and the carrier, so the honeycomb ceramic carrier coating is suitable for industrialized application.

Description

Technical field [0001] The invention relates to a preparation method of a honeycomb ceramic carrier coating. Background technique [0002] With the progress of society and rapid economic development, environmental pollution caused by automobile exhaust is becoming more and more serious. The method of catalytic purification of automobile exhaust is an effective means to reduce exhaust pollution. Due to the large flexibility of automobile operation, it should have high mechanical strength, good thermal stability, low thermal expansion coefficient and good durability as exhaust gas purification materials. Honeycomb ceramic cordierite is widely used as a carrier of automobile exhaust due to its high mechanical strength, good thermal stability, and low thermal expansion coefficient. However, the specific surface area of ​​cordierite is very small (<1m 2 / g), in order to reduce the volume of the purifier, a layer of high specific surface coating (washcoat) must be attached to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J37/02B01J35/04
Inventor 余林杨霞卿孙明李永峰
Owner GUANGDONG UNIV OF TECH
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