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Honeycomb ceramic carrier and preparation method thereof

A honeycomb ceramic carrier and ceramic technology, which is applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of peeling, unfavorable industrialization, easy cracking of coatings, etc. , the effect of high firmness

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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  • Honeycomb ceramic carrier and preparation method thereof
  • Honeycomb ceramic carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cordierite pretreatment: completely immerse cordierite honeycomb ceramics in 5wt% nitric acid solution for 1 hour, rinse with deionized water for 3 times after taking it out, put it in an oven at 120°C, and dry it for 10 hours to obtain Surface activated cordierite honeycomb ceramic support.

[0033] 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 of 8% based on alumina.

[0034] Composite coating slurry preparation: add 178ml of nitric acid solution (0.1mol / In L), after stirring evenly, add 52 grams of aluminum sol to it, use a high-shear dispersing emulsifier (FLUKO FA25 10000rpm) to shear and disperse for 10 minutes, and t...

Embodiment 2

[0038] Cordierite pretreatment: with embodiment 1.

[0039] Aluminum sol is commercially available (solid content is 15%, pH is 3-4).

[0040] 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.

[0041] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the above aluminum sol for 10 minutes, take it out, blow off the residual liquid, dry at 120°C for 8 hours, and bake at 550°C for 5 hours.

[0042] Composite coating loading: After immersing the alumina-coated carrier in the abo...

Embodiment 3

[0044] Cordierite pretreatment: with embodiment 1.

[0045] Aluminum sol preparation: same as embodiment 1.

[0046] 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.

[0047] Alumina coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the above-prepared aluminum sol for 8 minutes, take it out, blow off the residual liquid, dry at 110°C for 10 hours, and bake at 500°C for 5 hours.

[0048] Composite coating loading: After immersing the alumina-coated carrier in the above-mentioned additive solution for 8 minutes, take it out, blow of...

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Abstract

The invention discloses a 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; according to the total weight of the honeycomb ceramic carrier, the honeycomb ceramic carrier comprises 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; according to the total weight of the composite coating layer, the composite coating layer comprises 40-80 percent of titanium dioxide, 5-35 percent of silicon dioxide, 1-10 percent of aluminum oxide and 10-40 percent of auxiliaries. The preparation method comprises the following steps: (1) immersing the cordierite honeycomb ceramic base body into alumina sol for treatment, taking out the cordierite honeycomb ceramic base body, blowing away residual liquid, 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, 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 process is simple; the mechanical intensity of the base body is not damaged; the honeycomb ceramic carrier is suitable for industrial application.

Description

technical field [0001] The invention relates to a 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 bonding strength ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J35/04B01J37/025B01J23/10B01J21/14
Inventor 杨爱霞陈玉香王学海刘淑鹤
Owner CHINA PETROLEUM & CHEM CORP
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