High-firmness honeycomb ceramic carrier and preparation method thereof

A honeycomb ceramic carrier, firmness technology, applied in catalyst carriers, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as unfavorable industrialization, peeling, and easy cracking of the coating, etc. Achieve good penetration performance and wetting performance, improve firmness and good dispersion performance

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem that the coating is easy to crack and peel off, but the time and frequency of ultrasonic pretreatment are strictly controlled to avoid excessive collapse of the pore wall of the micropores. Especially for substrates of different strengths, ultrasonic pretreatment requires higher requirements. not conducive to industrialization

Method used

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  • High-firmness honeycomb ceramic carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cordierite acid treatment: add 5% hydrochloric acid solution to the lining to completely immerse the cordierite, seal the autoclave and place it in an oven at 250°C for 2 hours of hydrothermal treatment. After the hydrothermal treatment, the cordierite carrier was washed with distilled water until the washing liquid was neutral, and the distilled water on the surface was blown off with an air compressor, dried at 120°C for 8 hours, and calcined at 550°C for 3 hours to obtain a silicon-titanium oxide content of 2.8wt%. The properties of the product A1 are shown in Table 1.

[0038] Aluminum sol preparation: 20 grams of pseudoboehmite was added to 150 mL of deionized water, and 7 grams of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 2~5, and age for 24 hours to obtain a transparent aluminum sol with a content...

Embodiment 2

[0043] Cordierite acid treatment: Same as Example 1, except that 15% nitric acid solution was used instead and hydrothermally treated at 100°C for 3 hours to obtain a product A2 with a silicon-titanium oxide content of 0.5 wt%. The properties are shown in Table 1.

[0044] Aluminum sol is commercially available (solid content is 15%, pH is 3-4).

[0045] Composite coating slurry preparation: Add 54 grams of nano-titanium dioxide (50-100nm), 32 grams of fumed silica (10-80nm), and 17.2 grams of nano-cerium oxide into 280ml of carbonic acid solution (0.2mol / L), and stir evenly Finally, add 43 grams of aluminum sol to it, stir and mix for 90 minutes until uniform, add 4.3 grams of alkylphenol polyoxyethylene ether (molecular formula is RC 6 h 4 O(CH 2 CH 2 O) n H, where R is C 9 ~C 12 , n is 9~12), and then stir and mix for 30 minutes to obtain a uniform coating slurry.

[0046] Coating loading: Immerse A2 in the above-mentioned aluminum sol for 10 minutes, take it out, bl...

Embodiment 3

[0049] Cordierite acid treatment: Same as Example 1, except that 10% sulfuric acid solution was used instead and hydrothermally treated at 175°C for 1.5 hours to obtain a product A3 with a silicon-titanium oxide content of 1.2 wt%. The properties are shown in Table 1.

[0050] Aluminum sol preparation: same as embodiment 1.

[0051] Composite coating slurry preparation: Add 25 grams of nano-titanium dioxide (100-150nm), 5 grams of fumed silica (10-80nm), and 9.2 grams of nano-zirconia into 210ml of carbonic acid solution (0.3mol / L), and stir evenly Finally, 45 grams of aluminum sol was added thereto, and 6.1 grams of secondary octanol polyoxyethylene ether (molecular formula C 8 h 17 (CH 2 CH 2 O) n H, wherein n is 1 ~ 6), and then shear and disperse for 5 minutes to obtain a coating slurry.

[0052] Alumina coating loading: Immerse A3 in the aluminum sol prepared above for 8 minutes, take it out, blow off the residual liquid, dry at 110°C for 10 hours, and bake at 500°C ...

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Abstract

The invention discloses a high-firmness honeycomb ceramic carrier and a preparation method thereof. Cordierite honeycomb ceramic is used as a base body; an aluminum oxide coating layer and a composite coating layer are arranged on the surface of the base body in sequence; by the total weight of the honeycomb ceramic carrier, the honeycomb ceramic carrier contains 85-95 percent of cordierite honeycomb ceramic, 2-7 percent of the aluminum oxide coating layer and 3-8 percent of the composite coating layer; by the total weight of the composite coating layer, the composite coating layer contains 40-80 percent of titanium dioxide, 5-35 percent of silicon dioxide, 1-10 percent of aluminum oxide and 10-40 percent of an auxiliary. The preparation method comprises the following steps: (1) immersing the cordierite honeycomb ceramic base body subjected to acid treatment into alumina sol for treatment, taking out the cordierite honeycomb ceramic base body, blowing away residual liquid, and drying and roasting to obtain the cordierite honeycomb ceramic base body loaded with the aluminum oxide coating layer; (2) soaking the carrier obtained by the step (1) in composite coating layer slurry for treatment, taking out the carrier, blowing away the residual liquid, and drying and roasting to obtain a final product. The coating layer load of the honeycomb ceramic carrier is large, the firmness is high, and the preparation technology is simple; the mechanical strength of the base body is not damaged; the high-firmness honeycomb ceramic carrier is suitable for industrial application.

Description

technical field [0001] The invention relates to a high firmness honeycomb ceramic carrier and a preparation method thereof. Background technique [0002] Monolithic catalysts are integrated catalysts that are neatly arranged with many narrow parallel channels. Compared with traditional powder catalysts or granular catalysts, monolithic catalysts have the advantages of reduced bed pressure, high catalytic efficiency, and low amplification effect. At present, it is mainly used in the fields of automobile exhaust purification treatment, catalytic combustion of volatile organic compounds (VOC), and flue gas denitrification. [0003] Monolithic catalysts generally consist of substrates, coatings and active components. This type of catalyst is usually a honeycomb ceramic structure, that is, honeycomb ceramics are used as a substrate, coated with a carrier coating, and then loaded with catalyst active components. The catalytic effect of the catalyst is closely related to the bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/10B01J21/14B01J35/04
Inventor 刘淑鹤王学海陈玉香程明珠
Owner CHINA PETROLEUM & CHEM CORP
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