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Catalyst for decomposing formaldehyde and preparation method of catalyst

A catalyst and formaldehyde technology are applied in the field of catalyst for decomposing formaldehyde and its preparation, which can solve the problems of poor plasticity and low formaldehyde purification efficiency, and achieve the effects of improving catalytic efficiency, increasing surface area and improving purification rate.

Inactive Publication Date: 2019-05-24
ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a catalyst to solve the technical problems of the poor plasticity of the carrier of the catalyst and the low efficiency of formaldehyde purification in the prior art

Method used

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  • Catalyst for decomposing formaldehyde and preparation method of catalyst
  • Catalyst for decomposing formaldehyde and preparation method of catalyst
  • Catalyst for decomposing formaldehyde and preparation method of catalyst

Examples

Experimental program
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Embodiment approach

[0031] According to one embodiment of the catalyst of the present invention, the noble metal nanoparticles are preferably platinum nanoparticles.

[0032] Platinum nanoparticles are loaded on the titanium dioxide film of the titanium mesh, which has a better catalytic effect on the decomposition of formaldehyde. Of course, other noble metal nanoparticles, such as palladium nanoparticles, can also be used.

[0033] According to one embodiment of the catalyst of the present invention, the particle size of the platinum nanoparticles is preferably 4-6 nm.

[0034] The particle size of the platinum nanoparticles is 4-6nm, and the particle size is small, which increases the number of catalytic sites, improves the catalytic efficiency, and further improves the purification rate of formaldehyde.

[0035] According to one embodiment of the catalyst of the present invention, the mesh size of the titanium gauze is 20-100 mesh.

[0036] According to another aspect of the present inventio...

Embodiment 1

[0048] In the preparation method of this example, the pretreatment step of the titanium screen is firstly carried out: soak the titanium screen in the mixed acid solution for 5 minutes, place it in deionized water for ultrasonic cleaning for 30 minutes, take it out and dry it at 50° C. for 6 hours; wherein, The mixed acid is prepared by mixing hydrofluoric acid and nitric acid at a volume ratio of 1:1, the mass percentage concentration of hydrofluoric acid is 3%, and the mass percentage concentration of nitric acid is 15%; the preparation step of carrying out the titanium dioxide film: the titanium wire mesh Carry out calcination, the calcination temperature is 300°C, and the calcination time is 2h, so that the surface of the titanium mesh forms a titanium dioxide film; then proceed to the preparation step of noble metal nanoparticles: under the protection of the protective agent, use the reducing agent to reduce the noble metal compound to the noble metal nanometer Particles, ...

Embodiment 2

[0050] In the preparation method of this example, the pretreatment step of the titanium screen is firstly carried out: soak the titanium screen in the mixed acid solution for 15 minutes, place it in deionized water and ultrasonically clean it for 60 minutes, and dry it at 70° C. for 8 hours after taking it out; , the mixed acid is prepared by mixing hydrofluoric acid and nitric acid at a volume ratio of 2:1, the mass percentage concentration of hydrofluoric acid is 5%, and the mass percentage concentration of nitric acid is 30%; The screen is calcined, the calcining temperature is 500°C, and the calcining time is 6h, so that the surface of the titanium screen forms a titanium dioxide film; after that, the preparation step of noble metal nanoparticles is carried out: under the protection of the protective agent, the noble metal compound is reduced to Noble metal nanoparticles, and form noble metal nanoparticle colloids, the noble metal nanoparticles are platinum nanoparticles, t...

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Abstract

The invention provides a catalyst for decomposing formaldehyde and a preparation method of the catalyst. According to the catalyst for decomposing formaldehyde, a titanium wire mesh serves as a carrier, the surface of the titanium wire mesh is provided with a titanium dioxide thin film, and noble metal nano particles are loaded on the surface of the titanium dioxide thin film. The preparation method of the catalyst for decomposing formaldehyde comprises the steps of preparation of the titanium dioxide thin film, preparation of the noble metal nano particles, adsorption and activating. The catalyst takes the titanium wire mesh as the carrier, the mechanical property of the titanium wire mesh is good, and forming and machining can be carried out according to requirements; the titanium dioxide thin film is formed on the surface of the titanium wire mesh through calcination, so that the surface of the titanium dioxide thin film becomes rough, the surface area is increased, more precious metal particles can be adsorbed, the number of catalytic sites is increased, and the formaldehyde purification rate is increased; the particle size of the metal nano particles loaded on the surface of the carrier is small, the catalytic sites are increased, and the formaldehyde purification rate is further increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a catalyst for decomposing formaldehyde and a preparation method thereof. Background technique [0002] With the advancement of science and technology, the impact of air quality on human health has received more and more attention. With the development of industrialization, there are more and more air pollution sources and pollution types. Volatile organic pollutants are one of the pollution types, and formaldehyde is a kind of volatile organic pollutants that is closely related to people's living environment. pollutants. [0003] Long-term exposure to low-concentration formaldehyde can cause tears, sneezing and coughing, and even lead to diseases such as conjunctivitis, rhinitis, bronchitis, contact dermatitis, allergic asthma and allergic purpura; excessive concentration of formaldehyde can cause nausea, coughing, etc. , chest tightness, asthma and emphysema, and even poison ...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J37/16B01J37/02B01J37/08B01J35/10B82Y30/00B01D53/86B01D53/72
Inventor 黄勇李丽吴稷鎏孙明明李道远曹希传
Owner ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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