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A kind of coating method of monolithic catalyst active coating

A monolithic catalyst and active coating technology, applied in catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problem of uneven coating, difficult to control slurry viscosity and fluidity, low coating rate, etc. problem, to achieve the effect of uniform coating, no sintering, and high loading

Active Publication Date: 2017-07-18
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at many problems in the current technology that the slurry viscosity and fluidity are difficult to control, uneven coating and low coating rate, the present invention provides a coating technology with simple preparation, uniformity and high loading rate, which can make the active coating γ-Al 2 o 3 Successfully coated on the bluestone carrier, this technology can also be applied to the uniform coating of large carriers (such as 10cm*10cm*10cm)

Method used

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  • A kind of coating method of monolithic catalyst active coating
  • A kind of coating method of monolithic catalyst active coating
  • A kind of coating method of monolithic catalyst active coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, weigh 200 g of deionized water and place it in a 500 mL beaker, and add 190 g of γ-Al 2 o 3 and 10 g of pseudo-boehmite, add concentrated nitric acid (65% by mass fraction) to adjust the pH value of the slurry to 3.9, and continue stirring for 15 minutes.

[0024] Measure 200 mL of slurry in an evaporating dish with an inner diameter of 7 cm, put half of the cordierite carrier with a specification of 5 cm*5 cm*5 cm in the above evaporating dish, soak for 5-10 s, take it out, and use an empty The press blows the slurry at the mouth of the channel into the channel, and blows out the excess slurry. After all the channels no longer have excess slurry, the other half of the carrier that is not impregnated with slurry is submerged in the slurry again , soak for 5-10 s, take it out, blow the slurry into the channel with an air compressor, blow out the excess slurry, and dry it at room temperature for a few minutes. Transfer to an oven at 50°C for 12 h, and then bake i...

Embodiment 2

[0026] First, weigh 200 g of deionized water and place it in a 500 mL beaker, and add 185 g of γ-Al 2 o 3 and 15 g of pseudo-boehmite, adding concentrated nitric acid (65% by mass fraction) to adjust the pH value of the slurry to 3.9, and continued to stir for 15 minutes.

[0027] Measure 200 mL of slurry in an evaporating dish with an inner diameter of 7 cm, put half of the cordierite carrier with a specification of 5 cm*5 cm*5 cm in the above evaporating dish, soak for 5-10 s, take it out, and use an empty The press blows the slurry at the mouth of the channel into the channel, and blows out the excess slurry. After all the channels no longer have excess slurry, the other half of the carrier that is not impregnated with slurry is submerged in the slurry again , soak for 5-10 s, take it out, blow the slurry into the channel with an air compressor, blow out the excess slurry, and dry it at room temperature for a few minutes. Transfer to an oven at 50°C for 12 h, and then bak...

Embodiment 3

[0029] First, weigh 200 g of deionized water and place it in a 500 mL beaker, and add 175 g of γ-Al 2 o 3 and 25 g of pseudo-boehmite, adding concentrated nitric acid (65% by mass fraction) to adjust the pH value of the slurry to 3.9, and continued to stir for 15 minutes.

[0030]Measure 200 mL of slurry in an evaporating dish with an inner diameter of 7 cm, put half of the cordierite carrier with a specification of 5 cm*5 cm*5 cm in the above evaporating dish, soak for 5-10 s, take it out, and use an empty The press blows the slurry at the mouth of the channel into the channel, and blows out the excess slurry. After all the channels no longer have excess slurry, the other half of the carrier that is not impregnated with slurry is submerged in the slurry again , soak for 5-10 s, take it out, blow the slurry into the channel with an air compressor, blow out the excess slurry, and dry it at room temperature for a few minutes. Transfer to an oven at 50°C for 12 h, and then bake...

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Abstract

The invention discloses an application method for an integral catalyst active coating. An organic adhesive and a dispersant are not introduced in a slurry preparation process; de-ionized water is utilized as the dispersant; a small amount of pseudo-boehmite is added; and the viscosity and flowability of slurry are regulated by controlling the pH value. The ratio of the pseudo-boehmite to gamma-aluminum oxide is 1:20 to 3:20; the solid content is 35-50%; and the pH value is controlled to be 3.5-3.9. A honeycomb ceramic carrier uniformly coated with the active coating can be obtained through simple two-time short-time dipping, purging and drying roasting. The method has the advantages of simple raw materials, simple coating process, uniformity for coating, high loading capacity, low possibility of dropping, no sintering phenomenon and the like, and is especially suitable for mini-preparation of fundamental researches in labs.

Description

technical field [0001] The present invention relates to a coating method of monolithic catalyst active coating, in particular to the application of large specific surface area active coating γ-Al on a cordierite honeycomb carrier 2 o 3 coating method. Background technique [0002] Monolithic catalysts refer to monolithic structure catalysts with many narrow, straight, or curved parallel channels, which have been widely used in automobile exhaust, energy production, automotive Manufacturing, pollution control and chemical process and other fields. Monolithic catalysts generally consist of three parts: carrier, coating and active components. Generally, high temperature resistant ceramics and metal alloys are used as carriers. The metal carrier needs to be further improved due to its high temperature oxidation resistance and high temperature hydrothermal stability. At present, more and more honeycomb ceramics are used as the carrier. Ceramic carrier materials mainly includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/02B01J21/16B01J32/00B01J23/89
Inventor 何丹农袁静赵昆峰蔡婷高振源杨玲金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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