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Method for covering aluminum oxide coating on honeycomb shaped wire mesh carrier

A technology of honeycomb metal and aluminum oxide coating, which is applied in the direction of chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst carriers, etc. The layer preparation process is complicated and other problems, and the process is simple, and the effect of improving thermal shock resistance and mechanical vibration resistance is achieved.

Inactive Publication Date: 2008-10-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a method for coating an aluminum oxide coating on a honeycomb wire mesh carrier, which solves the problem of poor adhesion between the metal carrier and the coating in the prior art and the difficulty in coating preparation. Problems such as complex process, uneven coating on the metal surface, easy cracking and peeling off

Method used

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  • Method for covering aluminum oxide coating on honeycomb shaped wire mesh carrier
  • Method for covering aluminum oxide coating on honeycomb shaped wire mesh carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: select the honeycomb carrier specification of the aluminum-containing stainless steel wire mesh (30 orders, wire diameter 0.3mm) of 0Fe25Cr5Al to be

[0036] In the first step, the honeycomb wire mesh carrier is immersed in 10% sulfuric acid solution, soaked for 5 minutes under ultrasonic conditions, rinsed with deionized water after taking it out, and then dried at 100°C for 5 hours;

[0037] In the second step, add 8g of γ-Al to 184ml of absolute ethanol which is constantly stirring 2 o 3 powder (5-10μm in particle size) and 0.8g aluminum powder (4-5μm in particle size), then add 4ml of 1.016g / L polyacrylic acid ethanol solution and 12ml of 3g / L aluminum isopropoxide ethanol solution, the total volume of the slurry 200ml. After stirring for 30 minutes, sonicate in an ultrasonic oscillator for 30 minutes;

[0038] The third step is to apply a voltage of 10V to the slurry for 5h while stirring, and the electrodes used are stainless steel electrodes; ...

Embodiment 2

[0042] Embodiment 2: select the aluminum-containing stainless steel wire mesh (30 orders, wire diameter 0.3mm) of 0Fe25Cr5Al for use. The honeycomb carrier specification is

[0043] In the first step, the honeycomb wire mesh carrier is immersed in a sulfuric acid solution, soaked for 5 minutes under ultrasonic conditions, rinsed with deionized water after taking it out, and then dried at 100°C for 8 hours;

[0044] In the second step, add 8g of γ-Al to 184ml of absolute ethanol which is constantly stirring 2 o 3 powder (5-10μm in particle size) and 2.0g aluminum powder (4-5μm in particle size), then add 4ml of 1.016g / L polyacrylic acid ethanol solution and 12ml of 3g / L aluminum isopropoxide ethanol solution, the total volume of the slurry 200ml. After stirring for 30 minutes, sonicate in an ultrasonic oscillator for 30 minutes;

[0045] The third step is to apply a voltage of 20V to the slurry for 5h while stirring, and the electrodes used are stainless steel electrodes; ...

Embodiment 3

[0049] Embodiment 3: select the aluminum-containing stainless steel wire mesh (30 orders, wire diameter 0.3mm) of 0Fe25Cr5Al for use. The honeycomb carrier specification is

[0050] In the first step, the honeycomb wire mesh carrier is immersed in sulfuric acid solution, soaked under ultrasonic conditions for 10 minutes, taken out, rinsed with deionized water, and then dried at 100°C for 8 hours;

[0051] In the second step, add 8.0g of γ-Al to 184ml of absolute ethanol which is constantly stirring 2 o 3 powder (5-10 μm in particle size) and 8.0 g of aluminum powder (4-5 μm in particle size), then add 4 ml of 1.016 g / L polyacrylic acid ethanol solution and 12 ml of 3 g / L aluminum isopropoxide ethanol solution, the total amount of slurry The volume is 200ml. After stirring for 30 minutes, sonicate in an ultrasonic oscillator for 30 minutes;

[0052] The third step is to add 10V voltage to the slurry for 5 hours while stirring, and the electrodes used are stainless steel el...

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Abstract

The invention discloses a method for coating an alumina coating layer on a faviform metal wire mesh carrier, which belongs to the technical field of the preparation of the coating layers of metal carriers, and is characterized in that after the faviform metal wire mesh carrier is molded, a pretreatment is implemented on the metal surface, and then the faviform metal wire mesh carrier is soaked in a sizing agent that contains Gamma-Al2O3 powder and aluminum powder, the Gamma-Al2O3 powder and the aluminum powder are sedimentated on the surface of the faviform metal wire mesh carrier through the electrolytic deposition method, and finally the faviform metal wire mesh carrier coated with the coating layer is roasted, wherein, the faviform metal wire mesh carrier takes the material of a stainless metal wire mesh that contains aluminum, the coating layer is distributed evenly on the surface of the faviform metal wire mesh carrier and does not chap, the thickness of the coating layer is 30 to 80Mum; the addition of the aluminum powder improves the thermal shock resistance and the mechanical vibration resistance of the coating layer, as well as the conglutination degree between the coating layer and the faviform metal wire mesh. The method for coating the alumina coating layer on the faviform metal wire mesh carrier of the invention has the advantages that the method is applicable to the preparation of the coating layers of the catalyst carriers which are used in the gas-solid catalytic reactions that are related to the environmental protection field such as the fields of the tail gas burning of motor vehicles and fixed sources and catalytic burning.

Description

technical field [0001] The invention belongs to the technical field of metal carrier coating preparation and relates to a method for coating an aluminum oxide coating on a honeycomb wire mesh carrier. Background technique [0002] Most catalysts need to be attached to a certain catalyst carrier for catalysis. In order to expand the contact area between the catalyst and the carrier, it is necessary to coat the carrier with a layer of high specific surface area coating, γ-Al 2 o 3 Having a large specific surface area is one of the most commonly used carrier media in catalyst carrier preparation technology. [0003] The metal carrier has the advantages of small heat capacity, high thermal conductivity, and small exhaust resistance, but the specific surface area of ​​the metal carrier is very small. When used, it is necessary to load a layer of high specific surface area coating on the surface. [0004] Due to the large difference in thermal expansion coefficient between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J35/04B01J37/02B01J23/745B01J21/04
Inventor 全燮周云龙孙红赵雅芝陈硕
Owner DALIAN UNIV OF TECH
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