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A kind of preparation method of catalytic membrane for gas purification

A gas purification and catalytic membrane technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of difficult industrialization and amplification, single removal of impurities, and low efficiency.

Active Publication Date: 2017-04-05
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese utility model patent CN 2603691Y loads a photocatalytic nano-coating on porous ceramics to form a purification device for filtering and sterilizing water and air; Chinese invention patent CN 101322903A uses a photocatalytic active layer and an inorganic membrane for photocatalytic removal of SO 2 and NOx and other toxic gases; but both of them use a single photocatalytic active component. In the actual application system, there are problems such as low efficiency and single removal of impurities.
Chinese invention patent CN101745402A uses hydrothermal method to load Bi on high specific surface area substrate 2 WO 6 Photocatalyst, the catalytic membrane prepared by this method is expected to be used in sewage treatment, indoor and outdoor air purification, antibacterial, etc., but the cost of this method is high and it is difficult to scale up industrially

Method used

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  • A kind of preparation method of catalytic membrane for gas purification
  • A kind of preparation method of catalytic membrane for gas purification
  • A kind of preparation method of catalytic membrane for gas purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.1 mol of zinc acetate dihydrate, add ethanolamine which is equimolar to zinc acetate dihydrate, then add ethylene glycol methyl ether, the total volume of ethanolamine and ethylene glycol methyl ether is 100ml, heat and stir in a constant temperature water bath at 60°C 60min, prepare the precursor sol of 1mol / L; Al with porosity 30% 2 o 3 The membrane was placed in ethanol aqueous solution in advance, and ultrasonicated at 100kW, 30°C for 30min to remove the impurity components on the surface. The membrane was dried in a drying oven at 70°C for 1 hour, and then calcined in a muffle furnace at 500°C to obtain a SiC porous ceramic membrane modified by nano-zinc oxide. The loading of zinc oxide was 4%, and the average particle size was 60nm; the modified porous ceramic membrane was immersed in 1g / L chloroplatinic acid solution for 12h, taken out and dried completely, and calcined at 500°C to obtain Pt / ZnO / Al 2 o 3 In the catalytic membrane, the average particle ...

Embodiment 2

[0028] Weigh 0.1 mol of zinc acetate dihydrate, add ethanolamine which is equimolar to zinc acetate dihydrate, then add ethylene glycol methyl ether, the total volume of ethanolamine and ethylene glycol methyl ether is 100ml, heat and stir in a constant temperature water bath at 60°C 60min, prepare a precursor sol of 1mol / L; put SiC with a porosity of 75% into an aqueous ethanol solution in advance, and ultrasonicate at 100kW and 30°C for 30min to remove impurities on the surface. After drying at ℃, immerse in the sol and suck under negative pressure for 1h; put the impregnated porous ceramic membrane in a drying oven at 70℃ for 1h, and then put it in a muffle furnace for calcination at 800℃ to obtain a porous ceramic membrane made of zinc oxide. Modified SiC porous ceramic membrane, repeated impregnation and calcination process, so that the loading capacity of zinc oxide is 10%, and the average particle size of zinc oxide is 150nm;

[0029] The modified porous ceramic membran...

Embodiment 3

[0031] Weigh 0.1mol of zinc acetate dihydrate, add diethanolamine which is equimolar to zinc acetate dihydrate, then add ethylene glycol, the total volume of diethanolamine and ethylene glycol is 100ml, heat and stir in a constant temperature water bath at 60°C for 60min, Prepare the precursor sol of 1mol / L; ZrO with porosity 50% 2 Put it in the ethanol aqueous solution in advance, and ultrasonicate at 100kW, 30°C for 30min to remove the impurity components on the surface. After the ultrasonic porous ceramic membrane is dried at 70°C, it is immersed in the sol and sucked under negative pressure for 1h; the impregnated porous ceramic membrane The ceramic membrane was dried in a drying oven at 70°C for 1 hour, and then calcined in a muffle furnace at 600°C to obtain a SiC porous ceramic membrane modified by zinc oxide. The loading of zinc oxide was 5%, and the average particle size was 90nm;

[0032] Immerse the modified porous ceramic membrane in 1g / L palladium nitrate solutio...

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Abstract

The invention relates to a preparation method of a catalytic membrane used for gas purifying, a metal alkoxide precursor sol is used for modifying ceramic membrane channels, and after drying calcination, the ceramic membrane is impregnated in a precious metal salt solution, and again dried and calcined. The catalytic active components of the prepared catalytic membrane are a nano metal oxide and a precious metal. The prepared catalytic membrane can be applied to high temperature exhaust gas purification and atmospheric governance and other processes. The catalytic membrane can entrap and remove particle pollutants in a gas, meanwhile can effectively remove gas pollutants and bacteria microbes, and can realize gas purification integration.

Description

technical field [0001] The invention belongs to the field of gas purification, and in particular relates to a method for preparing a catalytic membrane for gas purification. Background technique [0002] The increasing emphasis on environmental protection in the chemical industry has put forward new demands for functional materials. In terms of high-temperature exhaust gas purification and atmospheric environment treatment with many components and complex forms, the current technology is relatively independent, and multiple functional units such as dust removal, denitrification, desulfurization, and VOCs removal are carried out separately, and the investment, energy consumption, and land occupation of facilities are large. . In response to the above problems, if multiple functions such as dust removal, denitrification, desulfurization, and VOCs removal can be realized in one operating unit to form a multifunctional reactor, the process of removing pollutants in the atmosphe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/72B01D53/60B01D53/68B01D53/62B01J27/224A62D3/30A62D101/20A62D101/28A61L9/16
CPCY02A50/20Y02C20/10
Inventor 邢卫红仲兆祥胡俭徐南平范益群
Owner NANJING TECH UNIV
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