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Coating method of catalyst and carbon smoke particle filter prepared with same

A catalyst and filter technology, applied in the field of air purification, can solve the problems of weak catalyst adhesion, different thermal expansion coefficients, shortened filter life, etc., and achieve the effect of improving catalytic effect and life, prolonging life, and improving adhesion.

Active Publication Date: 2016-08-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, under normal circumstances, most commercial filters use physical methods to coat materials such as precious metals on the carrier, but the catalyst coated in this way has the defect of weak adhesion of the catalyst on the substrate, and both the carrier and the catalyst Different coefficients of thermal expansion can also easily cause the catalyst layer to crack and fall off, shortening the life of the filter

Method used

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  • Coating method of catalyst and carbon smoke particle filter prepared with same
  • Coating method of catalyst and carbon smoke particle filter prepared with same
  • Coating method of catalyst and carbon smoke particle filter prepared with same

Examples

Experimental program
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preparation example Construction

[0038](2) Preparation of coating solution.

[0039] The catalyst source and carbon are weighed in a weight ratio of 1-10:1, placed in deionized water, and stirred evenly to obtain a coating solution; the catalyst source is a compound with a catalytic metal element.

[0040] It can be understood that the concentration of the catalyst source and carbon in the coating solution can be adjusted according to the required wrapping amount, but the catalyst source, carbon and deionized water are in a weight ratio of 1-10:1:1- 10, which can coat the catalyst source and carbon deposition on the surface of the metal-based carrier uniformly and in an appropriate amount.

[0041] Wherein, the catalyst source is a compound with a catalytic metal element, which only needs to be able to provide a catalytic metal element (such as noble metal, alkali metal, etc.) in the chemical deposition reaction. However, an alkali metal compound, such as a hydroxide of an alkali metal, is used. Lithium hydr...

Embodiment 1

[0051] A soot particle filter is prepared by the following catalyst coating method:

[0052] (1) Activation of metal-based supports.

[0053] The wire mesh with wavy stainless steel wire stacked and wound is used as the metal base carrier. The scanning electron microscope image of the wire mesh is as follows: figure 1 As shown, the metal-based carrier was put into deionized water and ultrasonicated for 0.5 h, then placed in a tube furnace and heated to 800 °C, and activated at this temperature for 8 h to obtain an activated metal-based carrier.

[0054] (2) Preparation of coating solution.

[0055] In parts by weight, take 2 parts of potassium hydroxide and 1 part of carbon black, add them to 5 parts of deionized water, stir evenly, form a slurry, and prepare a coating liquid.

[0056] (3) Wrapping of metal-based carrier.

[0057] Put the activated metal-based carrier (wire mesh) prepared in step (1) into the above coating solution in time, after ultrasonication for 1 hour,...

Embodiment 2

[0063] A soot particle filter is prepared by the following catalyst coating method:

[0064] (1) Activation of metal-based supports.

[0065] A metal mesh made of wavy stainless steel wires is used as a metal-based carrier. After the metal-based carrier is placed in deionized water for 3 hours, it is placed in a tube furnace and heated to 850 ° C. The temperature is maintained and activated for 10 hours. Activated metal-based supports.

[0066] (2) Preparation of coating solution.

[0067] In parts by weight, 3 parts of cesium chloride and 1 part of carbon black were added to 5 parts of deionized water, and stirred evenly to form a slurry to obtain a coating liquid.

[0068] (3) Wrapping of metal-based carrier.

[0069] Put the activated metal-based carrier (wire mesh) prepared in step (1) into the above-mentioned coating solution in time, after ultrasonication for 2 hours, let it stand for 12 hours, and dry it at 110°C for 24 hours to obtain the coated solution Wrapped me...

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Abstract

The invention relates to a coating method of a catalyst and a carbon smoke particle filter prepared with the same and belongs to the technical field of air purification. The coating method includes the steps of: 1) activation of a metal based carrier: activating the metal based carrier at 500-1000 DEG C for 5-10 h; 2) preparation of a coating solution: weighing a catalyst source and carbon according to the weight part ratio of 1-10:1, placing the components in deionized water, and stirring the solution uniformly, wherein the catalyst source is a compound containing a catalytic metal element; 3) coating of the metal based carrier: coating the surface of the metal based carrier with the catalyst source and the carbon in the coating solution in a deposition manner; and 4) chemical deposition: roasting the metal based carrier coated with the coating solution at 550-1100 DEG C for 4-12 h, and cooling the catalyst. The coating method can effectively deposit the active catalyst components on the surface of the carrier to form a stable compound, thereby improving adhesion force of the catalyst on the carrier.

Description

technical field [0001] The invention relates to the technical field of air purification, in particular to a catalyst coating method and a soot particle filter prepared by the method. Background technique [0002] In recent years, my country's smog weather has become more and more frequent. One of the main reasons is the soot particles emitted by diesel vehicles, especially PM2.5, which seriously threatens human health. In order to control its emissions, installing a particulate filter has become one of the most effective means. It can not only filter the exhaust gas, but also catalyze the combustion of soot after being coated with a catalyst, so that the filter can be passively regenerated. [0003] Common filter matrix materials generally include ceramic bases, metal bases, and the like. Among them, the ceramic matrix is ​​more common in the application, but the production process of the ceramic matrix filter body is complex, the thermal conductivity is small, and the radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/08B01J37/02B01D53/94
CPCB01D53/94B01D2258/01B01J37/0201B01J37/0207B01J37/0213B01J37/0215B01J37/0217B01J37/08
Inventor 张业新张建齐国禄
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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