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High temperature-resisting active coating and preparation method thereof

An active coating, high temperature resistant technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. problems such as low rate, to achieve the effect of simple method, easy operation and good heat resistance stability

Active Publication Date: 2012-09-19
JIANGSU GAOCHUN CERAMICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the prior art, which only focus on the firmness or high temperature resistance of the coating, and provide a coating with good coating effect and low shedding rate, which can still maintain high coating performance under high temperature and long-term use. Preparation method of active coating with specific surface area

Method used

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  • High temperature-resisting active coating and preparation method thereof
  • High temperature-resisting active coating and preparation method thereof
  • High temperature-resisting active coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take 5.0 grams of pseudoboehmite, 44 grams of γ-Al 2 o3 , 44 grams of Ce-Zr composite oxide, 1.25 grams of PEG6000, add 100 grams of deionized water and mix evenly;

[0032] (2) Take 8.4 grams of cerium nitrate, 0.35 grams of lanthanum nitrate, 5 grams of 7% polyvinyl alcohol aqueous solution, 2.0 grams of urea, add 50 grams of deionized water to dissolve and mix;

[0033] Mix the above two coating materials and stir evenly at high speed, slowly add 20.0 grams of SiO 2 Silica sol with a mass percentage of 22% and an average particle size of 15nm was moved to a ball mill jar and ball milled at a frequency of 30Hz for 16h to obtain a slurry, and then added HNO 3 Adjust the pH of the slurry to 3.5.

[0034] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and blow it with compressed air to remove the excess slurry in the channels, then dry it at 50°C for 2h, at 120°C for 2h, and bake it at 600°C for 3h. The product is ...

Embodiment 2

[0036] (1) Take 6.0 grams of pseudo-boehmite, 44 grams of γ-Al 2 o 3 , 44 grams of Ce-Zr-Al composite oxide, 2.0 grams of PEG8000, add 100 grams of deionized water and mix evenly;

[0037] (2) Take 8.0 grams of cerium nitrate, 0.40 grams of lanthanum nitrate, 0.40 grams of praseodymium nitrate, add 50 grams of deionized water to dissolve and mix;

[0038] Mix the above two coating materials and stir evenly at high speed, slowly add 20.0 grams of SiO 2 Silica sol with a mass percentage of 21% and an average particle size of 17nm was moved to a ball mill jar and milled at a frequency of 30Hz for 16h to obtain a slurry, and then HNO was added 3 Adjust the pH of the slurry to 3.7.

[0039] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and blow it with compressed air to remove the excess slurry in the channels, then dry it at 60°C for 2h, at 110°C for 4h, and bake it at 600°C for 3h. The product is labeled B.

Embodiment 3

[0041] (1) Take 6.0 grams of pseudo-boehmite, 44 grams of γ-Al 2 o 3 , 44 grams of Ce-Zr-Pr composite oxide, 1.5 grams of PEG5000, add 100 grams of deionized water and mix evenly;

[0042] (2) Take 8.4 grams of cerium nitrate, 0.35 grams of lanthanum nitrate, 4.5 grams of 7% polyvinyl alcohol aqueous solution, 2.0 grams of urea, add 50 grams of deionized water to dissolve and mix;

[0043] Mix the above two coating materials and stir evenly at high speed, slowly add 20.0 grams of SiO 2 Silica sol with a mass percentage of 22% and an average particle size of 15nm was moved to a ball mill jar and ball milled at a frequency of 30Hz for 16h to obtain a slurry, and then added HNO 3 Adjust the pH of the slurry to 3.6.

[0044] (3) Immerse the blank honeycomb ceramic carrier in the coating slurry for 2 minutes, take it out and blow it with compressed air to remove the excess slurry in the channels, then dry it at 60°C for 4 hours, at 110°C for 2 hours, and bake it at 700°C for 2 h...

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Abstract

The invention relates to a high temperature-resisting active coating for a three-way catalyst for purifying automobile exhaust. The high temperature-resisting active coating comprises the following components by weight percent: 20-80wt% of aluminum oxide, 5-50wt% of oxygen storage material, 0.5-5wt% of silica sol, 1-20wt% of metal nitrate, 0.1-5wt% of dispersant, and the balance of water, wherein the aluminum oxide is a mixture of pseudoboehmite and gamma-Al2O3; and the average particle size of the silica sol is 10-20nm. The preparation method comprises the steps of uniformly mixing materials; adding nitric acid to regulate the pH value to be 3.5-4.0 to obtain an active coating slurry; coating the slurry on a honeycomb ceramic carrier; blowing out excess slurry in the hole channel by using the compressed air; and finally, drying and roasting the product to obtain the high temperature-resisting active coating. The active coating has excellent heat-resisting stability, low expulsion rate and good coating effect. The preparation method is simple, is easy to operate and is suitable for commercial production.

Description

technical field [0001] The invention relates to a method for preparing a coating in the technical field of catalysts, in particular to a method for preparing a high-temperature resistant active coating. Background technique [0002] The three-way catalytic converter has become a key technology to control automobile exhaust emissions, which can convert CO, HC and NO in the exhaust x and other harmful ingredients are greatly reduced. The three-way catalytic converter generally consists of three parts: carrier, active coating and active components. The commonly used carrier is mainly cordierite honeycomb ceramic carrier. Since the specific surface area of ​​the honeycomb ceramic carrier is usually small, it is generally necessary to coat a layer of coating material with a large specific surface area and a firm bond on the carrier. Adjustments are made to improve catalytic activity and stability. [0003] The loading, firmness and heat resistance stability of the coating on ...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J35/04B01J23/10
Inventor 孙敏孔德双宦秀桦杨红兵
Owner JIANGSU GAOCHUN CERAMICS
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