A kind of preparation method of denitrification and mercury removal integral filter material

An integrated, filter material technology, applied in the field of composite filter materials, can solve the problems of hindering the exposure of catalyst active sites, low catalytic activity and efficiency, affecting the effect of dust removal and denitrification, etc., to achieve stable denitration and mercury removal efficiency, and simplify the production process. and cost, the effect of avoiding secondary pollution

Active Publication Date: 2021-02-26
YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: patent (CN107158799A) impregnates the metal salt solution of Mn, Ce, Zr in the filter material fiber, and then aging it with alkaline solution to obtain the dust removal and denitrification composite filter material fiber, but this loaded filter material Easy to pulverize and fall off, affecting the effect of dust removal and denitrification
The patent (CN104014200A) mixes the denitrification catalyst, polytetrafluoroethylene powder, diffusing agent, coupling agent, and lubricant in a certain proportion to make a catalytic filter membrane and obtain an integrated filter material for dust removal by hot pressing and compounding. Although the bonding fastness between the catalyst and the filter material is enhanced, the coating hinders the exposure of the active sites of the catalyst, and the utilization rate of the catalyst is low, resulting in problems such as low catalytic activity and efficiency.
Therefore, it is still a big challenge to integrate the denitrification and mercury removal catalyst with the dust removal filter material.

Method used

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  • A kind of preparation method of denitrification and mercury removal integral filter material
  • A kind of preparation method of denitrification and mercury removal integral filter material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The stainless steel fiber felt was punched into discs with a diameter of 3 cm, and the three discs were ultrasonically washed with ethanol and 1 mmol / L hydrochloric acid for 1 h to remove surface oil and oxides, and then rinsed with deionized water at 60 °C. down dry;

[0030] First weigh the Mn(NO 3 ) 2 (5mmol) and Al(NO 3 ) 3 .9H 2 Dissolve O (2 mmol) in 80 ml of deionized water, stir vigorously until completely dissolved to form solution A, slowly add 25% ammonia water dropwise to solution A, adjust the pH value to 8.5±0.2, stir and dissolve to form a suspension, transfer Put it into a 100ml reaction kettle, put it into an oven, control the reaction temperature at 100°C, and the reaction time is 24h. After the reaction, take out the reaction kettle and cool it to room temperature, take out the precipitate, and wash it with deionized water and absolute ethanol for 3 times. Dry at 80°C for 12h. Get the precursor Co 3-x mn x Al-LDHs; the above product at 400 o ...

Embodiment 2

[0035] The nickel fiber mat was punched into discs with a diameter of 3 cm, and three discs were ultrasonically washed with ethanol and 1 mmol / L hydrochloric acid for 1 h to remove surface oil and oxides, and then rinsed with deionized water for 60 o Dry at C;

[0036] First weigh the Co(NO 3 ) 2 .6H 2 O (8 mmol), 50% Mn(NO 3 ) 2 (15mmol) and Al(NO 3 ) 3 .9H 2 Dissolve O (7mmol) in 75ml of deionized water, stir vigorously until completely dissolved to form solution A, slowly add 2mol / L sodium hydroxide and sodium carbonate solution to solution A, adjust the pH value to 9.5±0.2 and stir to dissolve Form suspension B, transfer the suspension B to a 100ml reactor, put it into an oven, control the reaction temperature at 150°C, and the reaction time is 12 h. After the reaction, take out the reactor and cool it to room temperature, take out the precipitate, and use a deionized Water and absolute ethanol were washed by centrifugation three times, and dried at 80°C for 12 hours...

Embodiment 3

[0040] The iron-chromium-aluminum fiber mat was punched into discs with a diameter of 3 cm, and three discs were ultrasonically washed with ethanol and 1 mmol / L hydrochloric acid for 1 h to remove surface oil and oxides, and then rinsed with deionized water. 60 o Dry at C;

[0041] First weigh the Co(NO 3 ) 2 .6H 2 O (10 mmol), 50% Mn(NO 3 ) 2 (20mmol) and Al(NO 3 ) 3 .9H 2 Dissolve O (10mmol) in 60 ml of deionized water, stir vigorously until completely dissolved to form solution A, slowly add 25% ammonia water dropwise to solution A, adjust the pH value to 10.5±0.2, stir and dissolve to form suspension B, Transfer the suspension B to a 100ml reactor and put it in an oven. The reaction temperature is controlled at 200°C and the reaction time is 8 h. After the reaction, take out the reactor and cool it to room temperature. Take out the precipitate and wash it with deionized water and absolute ethanol. Each was centrifuged and washed 3 times, and dried at 80°C for 12 h...

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Abstract

The invention discloses a method for preparing a monolithic filter material for denitrification and demercuration, which comprises the following steps: immersing a pretreated metal fiber felt in a metal salt precursor solution, and then immersing the metal fiber felt in the process of hydrothermal and high-temperature calcination. The surface of the felt grows in situ a multi-functional integral filter material that not only has the catalytic function of denitrification and mercury removal, but also can remove dust. The multi-functional composite filter material for denitrification, mercury removal and dust removal prepared by the present invention can not only avoid the adverse effect of fly ash particles on the catalyst, but also effectively reduce the discharge of fine dust; and the catalyst is firmly combined with the filter material without affecting the inherent performance of the filter material. Especially suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a denitrification and demercury integral filter material, which belongs to the technical field of composite filter materials. Background technique [0002] Nitrogen oxides (NOX) in the atmosphere mainly come from the flue gas emitted from steel, cement, ceramic glass, coal-fired power plants, waste incineration, etc., which can easily cause air pollution such as smog, photochemical smog, and acid rain. In addition, mercury in industrial flue gas is also a major environmental pollutant, and it is the most serious emission from coal-fired power plants. Mercury emitted into the atmosphere from coal combustion mainly includes elemental mercury (Hg0), divalent mercury (Hg 2+ ), particulate adsorption of mercury (Hgp). Among them, through wet desulfurization and dedusting processes, Hg 2+ It can be effectively removed with Hgp, but Hg0 has strong dissociation, low solubility in water, and is difficult to remo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20B01D46/30B01D53/86B01D53/56B01D53/64B01J23/889B01J35/02
CPCB01D39/20B01D46/30B01D53/8628B01D53/8665B01J23/8892B01J35/026
Inventor 陈建军单良李俊华王慧
Owner YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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