A kind of preparation method of ozone decomposition catalyst in high-humidity exhaust gas

A technology of ozone decomposition and catalyst, which is applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc. It can solve the problems of the decrease of ozone catalytic degradation efficiency and the catalyst's inability to withstand high humidity exhaust gas, so as to save power energy consumption and ensure catalytic decomposition effect, the effect of increasing the load

Active Publication Date: 2022-08-09
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing an ozone decomposition catalyst in high-humidity tail gas in order to overcome the defects in the above-mentioned prior art, and solve the technical problem that the catalyst in the prior art cannot withstand high-humidity tail gas
Thereby overcoming the problem that the catalytic degradation efficiency of ozone in high-humidity tail gas decreases, the preparation method comprises the following steps:

Method used

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  • A kind of preparation method of ozone decomposition catalyst in high-humidity exhaust gas
  • A kind of preparation method of ozone decomposition catalyst in high-humidity exhaust gas

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[0024] A method for preparing an ozone decomposition catalyst in a high-humidity exhaust gas, comprising the following steps:

[0025] (1) The molar ratio of ferric nitrate, manganese nitrate, copper nitrate and silver nitrate is 1:(0.1~1):(0.1~1):(0.1~0.5) deionized water, the amount of deionized water and the ferric nitrate The molar ratio is (80-200):1, and it is configured as an immersion liquid. Add ZSM-5 molecular sieve powder with a silicon-alumina ratio of 50-300 to the impregnation solution, and the molecular sieve dosage is 1-2 times the mass of iron nitrate, manganese nitrate, copper nitrate and silver nitrate, and ultrasonically disperse. Place on a shaker and soak for 2 to 24 hours. filter. Transfer to an oven and dry at 60-100°C for 2-6 hours. Transfer to a muffle furnace and bake at 400-550°C for 2-6 hours. Grind into powder and pass through a 200-mesh sieve. The supported molecular sieve powder was obtained.

[0026] (2) Dissolve ethyl orthosilicate and a...

Embodiment 1

[0030] Ferric nitrate, manganese nitrate, copper nitrate and silver nitrate were dissolved in 80moL of deionized water at the rate of 1moL:1moL:1moL:0.5moL to prepare an immersion solution. 780 g of ZSM-5 molecular sieve powder with a silicon-alumina ratio of 300 was added to the impregnation solution, and ultrasonically dispersed. Place on shaker and soak for 24 hours. Transfer to an oven and dry at 80°C for 4 hours. Transfer to a muffle furnace and bake at 400°C for 2 hours. Grind into powder and pass through a 200-mesh sieve. The supported molecular sieve powder was obtained.

[0031]Ethyl orthosilicate and n-propyl triethoxysilane are dissolved in ethanol, and the dosages of ethyl orthosilicate, n-propyl triethoxysilane and ethanol are 1moL:0.1moL:5moL. Rapid stirring, dropwise addition of 0.3 mol / L dilute hydrochloric acid to adjust pH to 2, and stirring at room temperature for 12 hours. 10.4 g of the above-obtained supported molecular sieve powder was added, stirred...

Embodiment 2

[0043] Ferric nitrate, manganese nitrate, copper nitrate, and silver nitrate were dissolved in 200 moL of deionized water at the rate of 1moL:0.1moL:0.1moL:0.1moL to prepare an immersion solution. 591 g of ZSM-5 molecular sieve powder with a silicon-alumina ratio of 50 was added to the impregnation solution, and ultrasonically dispersed. Place on shaker and soak for 24 hours. filter. Transfer to an oven and dry at 80°C for 2 hours. Transfer to a muffle furnace and bake at 550°C for 2 hours. Grind into powder and pass through a 200-mesh sieve. The supported molecular sieve powder was obtained.

[0044] Ethyl orthosilicate and n-octyltriethoxysilane are dissolved in ethanol, and the molar ratio of ethyl orthosilicate, n-octyltriethoxysilane and ethanol is 1:0.5:10. Rapid stirring, dropwise addition of 0.3 mol / L hydrochloric acid to adjust pH to 4, and stirring at room temperature for 24 hours. 42 g of the above-obtained supported molecular sieve powder was added, stirred r...

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Abstract

The invention relates to a method for preparing an ozone decomposition catalyst in high-humidity exhaust gas. Active components are loaded on ZSM-5 molecular sieve powder and used to prepare molecular sieve-silica aerogel, which is used for ozone in high-humidity exhaust gas. Catalytic decomposition. Compared with the prior art, the surface of the molecular sieve-silica composite aerogel prepared by the present invention is hydrophobic, which can prevent the condensation of water vapor on the surface of the catalyst, effectively improve the anti-high humidity performance of the catalyst, and at the same time, the composite aerogel has The highly developed pore structure has low resistance to exhaust gas and saves power and energy consumption.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a preparation method of an ozone decomposition catalyst in high-humidity exhaust gas. Background technique [0002] Ozone is a strong oxidant and is more soluble in water than oxygen. Therefore, ozone is often used for oxidative degradation of organic matter in wastewater. Its core devices are gas-liquid contact devices such as ozone contact pool and ozone contact tower. However, the utilization rate of ozone in the gas is usually only 70% to 90%, and it is difficult to fully utilize it. As a result, the exhaust gas still contains a certain amount of ozone. If it is directly discharged into the atmosphere, it will cause atmospheric pollution. The environmental emission regulation of ozone tail gas is 0.12mg / m 3 . Therefore, effective measures must be taken to remove ozone from exhaust gas. [0003] At present, the main methods for removing ozone in exhaust gas are therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01D53/86B01D53/66
CPCB01J29/48B01D53/8675B01J2229/186Y02A50/20
Inventor 徐增益余金鹏徐华胜王鹏飞李森王世勇
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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