Ceramics catalyst surface active coating and its preparation method

A technology of ceramic catalyst and surface activity, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., which can solve the problems of low coating amount of active coating, high equipment requirements, complicated operation, etc., and achieve easy quantification The effect of chemical and industrialized production, low shedding rate and simple preparation method

Inactive Publication Date: 2010-02-24
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active coating prepared by this method has a low coating amount at one time, and has high requirements for equipment. It needs to provide a vacuum system and the operation is complicated.

Method used

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  • Ceramics catalyst surface active coating and its preparation method
  • Ceramics catalyst surface active coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 5g of pseudo-boehmite, 10g of deionized water, 0.05g of ethylene glycol, mix well, beat at 600r / min for 15min, add HNO 3 Adjust the pH of the slurry to 3.5.

[0029] The honeycomb ceramics were immersed in the coating slurry for 1 min, and the excess slurry in the channels was blown away with high-pressure air, then dried at 120°C for 4 hours, and fired at 500°C for 3 hours to obtain a coating. The active coating loading was 14.75%.

[0030] After the same detection steps as the comparative example, the shedding rate of the coating obtained in this embodiment was 1.53%.

Embodiment 2

[0032] Weigh 5g of pseudo-boehmite, 10g of deionized water, and 0.05g of glycerol, mix well, beat at a speed of 600r / min for 15min, add HNO 3 Adjust the pH of the slurry to 3.5.

[0033] The honeycomb ceramics were dipped in the coating slurry for 1 min, and after taking it out, the excess slurry in the channels was blown away with high-pressure air, then dried at 120°C for 4 hours, and fired at 500°C for 3 hours to obtain a coating. The active coating loading was 14.58%.

[0034] After the same detection steps as the comparative example, the shedding rate of the coating obtained in this embodiment was 0.19%.

Embodiment 3

[0036] Weigh 5g of pseudo-boehmite, 10g of deionized water, 0.05g of polyethylene glycol 300, mix well, beat at 600r / min for 15min, add HNO 3 Adjust the pH of the slurry to 3.5.

[0037] The honeycomb ceramics were dipped in the coating slurry for 1 min, and after taking it out, the excess slurry in the channels was blown away with high-pressure air, then dried at 120°C for 4 hours, and fired at 500°C for 3 hours to obtain a coating. The active coating loading was 14.51%.

[0038] After the same detection steps as the comparative example, the shedding rate of the coating obtained in this embodiment was 0.99%.

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Abstract

A ceramics catalyst surface active coating in the catalyst technical field and its preparation method. The coating has following components in mass ratio: 6.62-33.11% of pseudo-boehmite, 0-26.49% of gamma-alumina and 0.33-1.96% of additive and the balance of water. The produced active alumina coating has small deposition loss, has uniform coating and stable physical and chemical properties. The obtained coating has low shedding rate of less than 1.55%.

Description

technical field [0001] The invention relates to a material in the technical field of catalysts and a preparation method thereof, in particular to an active coating on the surface of a ceramic catalyst and a preparation method thereof. Background technique [0002] Honeycomb ceramics are widely used as monolithic catalyst carrier materials due to their excellent properties such as high temperature resistance, oxidation resistance, corrosion resistance, and wear resistance. However, the specific surface area of ​​honeycomb ceramic materials is usually relatively small. In order to make the active components stable, highly dispersed and have a long life on the surface of the carrier, it is necessary to coat a layer of coating material with a large specific surface area and not easy to fall off on the carrier. It meets the requirements of a catalyst support. The load and firmness of the coating on the honeycomb ceramic carrier are important factors affecting the catalytic activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J37/02B01J32/00B01J35/10
Inventor 刘洋姚炜周洁张豪杰金彩虹何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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