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Co-In/Hbeta catalyst and preparation method and application thereof

A catalyst and co-in technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of high pipeline equipment requirements, poor water resistance and sulfur resistance, easy leakage reaction, etc., to achieve catalytic The active effect is obvious, the effect of improving water and sulfur resistance and reducing the active temperature

Inactive Publication Date: 2010-03-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this technology has obvious disadvantages: ①NH 3 It is a toxic and corrosive gas, which is difficult to store and transport, requires high pipeline equipment, and is expensive; ②NH in this process 3 It is necessary to measure and control the addition amount, which is easy to leak or cause secondary pollution due to incomplete reaction; ③NH 3 with SO in the flue gas 2 reaction, forming corrosive NH 4 HSO 4 , easy to poison the catalyst
Catalytic reduction of NO due to the use of low-carbon hydrocarbons as reductants x The reaction temperature is high, and the resistance to water and sulfur is poor

Method used

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  • Co-In/Hbeta catalyst and preparation method and application thereof
  • Co-In/Hbeta catalyst and preparation method and application thereof
  • Co-In/Hbeta catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0017] The preparation method of the Co-In / Hbeta catalyst is to co-impregnate cobalt nitrate and indium nitrate solutions with a molar concentration of 0.05-0.2mol / L on the H-beta molecular sieve, leave it at room temperature for 20-26 hours, and bake it at 100-120°C. 3-6 hours, then calcined at 400-600° C. for 2-6 hours, finally pressed into tablets, pulverized and sieved with 40-60 mesh to obtain Co-In / Hbeta catalyst.

[0018] The Co-In / Hbeta catalyst can be applied to pulse plasma synergistic catalytic purification of nitrogen oxides in coal-fired flue gas. The method for synergistic catalytic purification of nitrogen oxides in coal-fired flue gas is: in 10000h -1 Under the condition of space velocity, low-carbon hydrocarbons are used as reducing agents, and Co-In / Hbeta is used as catalyst to catalytically reduce nitrogen oxides in flue gas. The volume concentration ratio of low-carbon hydrocarbons and nitrogen oxides in flue gas is 0.5- 3. The reaction temperature is 200-...

Embodiment 1

[0022] The catalyst of the present invention uses cobalt and indium as active components, and is carried on an artificially synthesized Hbeta molecular sieve with a silicon-to-aluminum ratio of 25. The weight percent of cobalt carried on the molecular sieve is 3%, and the weight percent of indium is 3%. %, namely: Co-In / Hbeta (3:3:100);

[0023] Now take the Co-In / H-beta catalyst (silicon-aluminum ratio is 25) that contains Co3%, In3% (percentage by weight) as an example to generally describe the use and effect thereof of process equipment among the present invention, specifically for:

[0024] Cobalt nitrate and indium nitrate were used to prepare In-containing 2+ and Co 2+ A solution of 0.1mol / L is used as the impregnation solution. Take 37ml of the solution and impregnate it on 10 grams of H-beta molecular sieve, let it stand for 24 hours, bake it at 120°C for 5 hours, put it in a muffle furnace and bake it at 500°C for 3 hours, and finally The catalyst was pressed into ...

Embodiment 2

[0030] The catalyst of the present invention uses cobalt and indium as active components, and is carried on an artificially synthesized Hbeta molecular sieve with a silicon-to-aluminum ratio of 25. The weight percent of cobalt carried on the molecular sieve is 3%, and the weight percent of indium is 3%. %, namely: Co-In / Hbeta (3:3:100);

[0031] Now take the Co-In / H-beta catalyst (silicon-aluminum ratio is 25) that contains Co2%, In2% (percentage by weight) as an example to generally describe the use and effect thereof of process equipment among the present invention, specifically for:

[0032] Cobalt nitrate and indium nitrate were used to prepare In-containing 2+ and Co 2+A solution of 0.1mol / L is used as the impregnation solution. Take 24.5ml of the solution and impregnate it on 10 grams of H-beta molecular sieve, let it stand for 24 hours, bake it at 120°C for 5 hours, and bake it in a muffle furnace for 3 hours at 500°C after drying. Finally, the catalyst was pressed i...

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Abstract

The invention discloses a Co-In / Hbeta catalyst and a preparation method and an application thereof for the synergetic catalysis and purification of nitrogen oxides in coal-fired flue gas. The catalystadopts Co and In as active components to load on H-beta molecular sieve with the silica-alumina ratio of 10-50 and the weight percentages of Co and In loaded on the H-beta molecular sieve are both 1-5%. The invention adopts dielectric barrier plasma to induce light hydrocarbon to perform selective catalyctic reduction of nitrogen oxides so as to increase the removal rate of nitrogen oxides, reduce the activity temperature and increase the water resistance and sulfur resistance of the catalyst.

Description

[0001] Technology area [0002] The invention relates to the field of pollution control and technology, in particular to a method for selectively catalytically reducing nitrogen oxides induced by pulsed plasma. Background technique [0003] Nitrogen oxides (NO x ) is the main species and trigger for the formation of acid rain and photochemical smog, which can cause diseases such as emphysema, vision loss and bronchitis in humans. Therefore, the efficient elimination of NO x The study of the process becomes more important. NO x The main sources of gas are the flue gas of various combustion furnaces and the exhaust gas of various motor vehicles. Currently, selective catalytic reduction of ammonia under oxygen atmosphere (NH 3 -SCR) is a NO reduction method commonly used in developed countries x The most effective method of emission, with high removal efficiency. But this technology has obvious disadvantages: ①NH 3 It is a toxic and corrosive gas, which is difficult to st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/02B01D53/56B01D53/86B01D53/76B01D53/74
Inventor 施耀苏清发潘华陈杰
Owner ZHEJIANG UNIV
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