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Preparation method of catalytic membrane used for gas purifying

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 high cost, single, difficult to scale up in industrialization, etc.

Active Publication Date: 2015-09-16
NANJING UNIV OF TECH
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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 101322903 A uses a photocatalytic active layer and a separation active layer Inorganic membrane, in order to photocatalytically remove toxic gases such as SO2 and NOx; but both of them use a single photocatalytic active component, and in the actual application system, there are low efficiency and single removal of impurities. question
Chinese invention patent CN101745402 A uses a hydrothermal method to support Bi2WO6 photocatalyst on a substrate with a high specific surface area. The catalytic membrane prepared by this method is expected to be used in sewage treatment, indoor outside 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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  • Preparation method of catalytic membrane used for gas purifying
  • Preparation method of catalytic membrane used for gas purifying
  • Preparation method of catalytic membrane used for gas purifying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 0.1 mol of zinc acetate dihydrate, add ethanolamine equimolar to zinc acetate dihydrate, then add glycol methyl ether, the total volume of ethanolamine and glycol methyl ether is 100ml, and heat and stir in a constant temperature water bath at 60°C 60min, prepare 1mol / L precursor sol; change the porosity of Al with 30% 2 O 3 The membrane was put into an ethanol aqueous solution in advance, and ultrasonicated for 30 minutes at 100kW and 30°C to remove the impurities on the surface. After the ultrasonic porous ceramic membrane was dried at 70°C, it was immersed in the sol and suctioned under negative pressure for 1h; 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 prepare a porous SiC ceramic membrane with pores modified by nano-zinc oxide. The zinc oxide loading was 4% and the average particle size Is 60nm;

[0027] The modified porous ceramic membrane was immersed in a 1g / L chloroplatinic acid solution for...

Embodiment 2

[0029] Weigh 0.1 mol of zinc acetate dihydrate, add ethanolamine equimolar to zinc acetate dihydrate, then add glycol methyl ether, the total volume of ethanolamine and glycol methyl ether is 100ml, and heat and stir in a constant temperature water bath at 60°C 60min, prepare 1mol / L precursor sol; put SiC with 75% porosity into ethanol aqueous solution in advance, and sonicate it at 100kW and 30℃ for 30min to remove impurities on the surface. The porous ceramic membrane after ultrasound is at 70 After drying at ℃, immerse in the sol, suction for 1h; put the impregnated porous ceramic membrane in a drying oven at 70℃ for 1h, and then put it in a muffle furnace and calcine at 800℃ to produce zinc oxide with pores The modified SiC porous ceramic membrane is repeatedly impregnated and calcined so that the loading amount of zinc oxide is 10%, and the average particle size of zinc oxide is 150nm;

[0030] The modified porous ceramic membrane was immersed in a 1g / L chloroplatinic acid s...

Embodiment 3

[0032] Weigh 0.1 mol of zinc acetate dihydrate, add diethanolamine 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 60 minutes, Preparation of 1mol / L precursor sol; ZrO with 50% porosity 2 Put it into the ethanol aqueous solution in advance, ultrasonic for 30min at 100kW, 30℃, to remove the impurity components on the surface, the porous ceramic membrane after ultrasound is dried at 70℃, immersed in the sol, vacuum suction for 1h; the impregnated porous The ceramic membrane was dried in a drying oven at 70°C for 1 hour, and then placed in a muffle furnace and calcined at 600°C to prepare a SiC porous ceramic membrane with pores modified by zinc oxide. The zinc oxide loading was 5% and the average particle size Is 90nm;

[0033] The modified porous ceramic membrane was immersed in a 1g / L palladium nitrate solution for 12 hours, taken out and ...

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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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IPC IPC(8): B01D53/86B01D53/72B01D53/60B01D53/68B01D53/62B01J27/224A62D3/30A62D101/20A62D101/28A61L9/16
CPCY02C20/10Y02A50/20
Inventor 邢卫红仲兆祥胡俭徐南平范益群
Owner NANJING UNIV OF TECH
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