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Method for applying coating on cordierite honeycomb ceramics and applications thereof

A technology of cordierite honeycomb and ceramics, which can be used in applications, ceramic products, and other household appliances, etc., and can solve problems such as the inability to modify aluminum sol, coating pollution, and concentration limitations of aluminum sol

Active Publication Date: 2010-06-16
FOSHAN SHUNDE KINGLEI ENVIRONMENT & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of method needs to add a large amount of additional reagents, and there are strict restrictions on the concentration of aluminum sol, and aluminum sol with too high a concentration cannot be modified; at the same time, in order to avoid pollution to the coating, the added additional reagents need to be roasted to remove. This also results in a large waste of

Method used

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  • Method for applying coating on cordierite honeycomb ceramics and applications thereof
  • Method for applying coating on cordierite honeycomb ceramics and applications thereof
  • Method for applying coating on cordierite honeycomb ceramics and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pretreatment of cordierite honeycomb ceramics: heat and boil the cordierite honeycomb ceramics in 12wt% nitric acid solution for 20 minutes, take them out, rinse them with distilled water and dry them; cut the processed honeycomb ceramics into 15mm×15mm×25mm.

[0019] Using the pseudo-boehmite slurry with a solid content of 10wt% as raw material, add nitric acid, the acid-aluminum molar ratio is 0.1, stir and reflux in a water bath at 80°C for 4 hours, and age overnight; then the pretreated cordierite honeycomb ceramics One end is immersed in the aluminum sol impregnation solution, the other end is connected to the vacuum device through a rubber hose, and the vacuum degree is controlled to be 0.02MPa; then every 3 minutes, the vacuum device is suspended, and the reverse air is blown for 10 seconds, and then the vacuum is repeated for impregnation; finally, the vacuum is pumped After a total of 6 minutes of extraction and impregnation, turn off the vacuum device, take out...

Embodiment 2

[0022] Using the pseudo-boehmite slurry with a solid content of 12wt% as raw material, add nitric acid, the acid-aluminum molar ratio is 0.1, stir and reflux in a water bath at 80°C for 6 hours, and age overnight; then the pretreated cordierite honeycomb ceramics One end is immersed in the aluminum sol impregnation solution, the other end is connected to the vacuum device through a rubber hose, and the vacuum degree is controlled to be 0.05MPa; then every 3 minutes, the vacuum device is suspended, the reverse air is blown for 20 seconds, and then the vacuum is repeated for impregnation; finally, the vacuum is pumped After extraction and impregnation for a total of 12 minutes, turn off the vacuum device, take out the honeycomb ceramics, blow off the residual liquid inside the channels, dry at 100°C for 3 hours, and bake at 500°C for 4 hours.

[0023] The aluminum sol used in this example has a solid content of 12 wt % and a viscosity of 35 mPa·s. The coating coverage and specifi...

Embodiment 3

[0025] Using the pseudo-boehmite slurry with a solid content of 14wt% as raw material, add nitric acid, the acid-aluminum molar ratio is 0.1, stir and reflux in a water bath at 80°C for 8 hours, and age overnight; then the pretreated cordierite honeycomb ceramics One end is immersed in the aluminum sol impregnation solution, the other end is connected to the vacuum device through a rubber hose, and the vacuum degree is controlled to be 0.07MPa; then every 3 minutes, the vacuum device is suspended, the reverse air is blown for 30 seconds, and then the vacuum is repeated for impregnation; finally, the vacuum is pumped After a total of 9 minutes of extraction and impregnation, turn off the vacuum device, take out the honeycomb ceramics, blow off the residual liquid inside the channels, dry at 110°C for 2 hours, and bake at 500°C for 4 hours.

[0026] The aluminum sol used in this example has a solid content of 14 wt % and a viscosity of 60 mPa·s. The coating coverage and specific ...

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Abstract

The invention discloses a method for applying a coating on cordierite honeycomb ceramics and applications thereof. Started with the improvement of the immersion coating technique, the invention applies a thick dense alumina coating with uniform distribution, high coating rate and high specific area on the surface of pore canals of the cordierite honeycomb ceramics by using a vacuum extraction immersion method. In particular, when the viscosity of the alumina sol is greater than or equal to 35 mPa.s, the alumina sol can not easily enter the interior of the pore canals of the honeycomb ceramics by using the common immersion method, and the coating can not be applied normally, while the vacuum extraction immersion technique of the invention does not have the defect, and can be used for uniformly applying the alumina coating with high coating rate. When the honeycomb ceramics applied with the alumina coating by using the method of the invention is loaded with an integral catalyst prepared from noble metal Pd and used for cleaning treatment of toluene catalytic combustion, the percent conversion of toluene can reach 99% at the low temperature of 215 DEG C, and the concentration of toluene is reduced to below 40 mg / m<3>.

Description

technical field [0001] The invention relates to a method for uniformly coating an alumina coating on cordierite honeycomb ceramics and its application. Background technique [0002] Because of its regular pore structure, good thermal stability, low price, and convenient processing and molding, cordierite honeycomb ceramics are currently one of the main skeleton substrates for supported noble metal monolithic catalysts used in the catalytic combustion and purification of VOCs (such as toluene, etc.) . Compared with supported noble metal granular catalysts, this type of monolithic catalyst has a large number of hollow pores on the macro scale due to its unique skeleton structure, and there is no radial body transmission of fluid between parallel pores, so the pressure drop is 2~ lower than that of granular catalysts. 3 orders of magnitude, good heat and mass transfer performance, and simple industrial scale-up. However, due to the small specific surface area of ​​honeycomb c...

Claims

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Application Information

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IPC IPC(8): C04B41/85C04B41/80C04B38/00B01J32/00B01J37/02B01J23/44
Inventor 李永峰李宇余林麦荣坚刘祖超
Owner FOSHAN SHUNDE KINGLEI ENVIRONMENT & TECH CO LTD
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