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Preparation method of denitration demercuration integral filter material

An integral filter material technology, applied in the field of composite filter material, can solve the problems of hindering the exposure of catalyst active sites, affecting the effect of dust removal and denitrification, and low catalytic activity and efficiency, so as to achieve stable denitrification and mercury removal efficiency and avoid secondary Effects of pollution, simplification of production process and cost

Active Publication Date: 2018-12-04
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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  • Preparation method of denitration demercuration integral filter material
  • Preparation method of denitration demercuration integral filter material

Examples

Experimental program
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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 (7 mmol) 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 Dissolve to form a suspension B, transfer the suspension B to a 100ml reaction kettle, 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 reaction kettle and cool it to room temperature, take out the precipitate, and use The deionized water and absolute ethanol were washed by centrifugation three times, and dried...

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 preparation method of a denitration demercuration integral filter material. The preparation method comprises the following steps: dipping a pretreated metal fiber felt into ametal salt precursor solution, and growing the multifunctional integral filter material with the denitration and demercuration catalysis function and the dust removal function on the surface of the metal fiber felt in situ through the processes of hydrothermal treatment, high-temperature calcination and the like. The denitration demercuration and dust removal multifunctional composite filter material disclosed by the invention not only can avoid the adverse effect of fly ash particles on the catalyst, fine dust can be effectively reduced, and the catalyst is firmly combined with the filter material, the inherent performance of the filter material is not influenced, and the method is particularly 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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IPC IPC(8): B01D39/20B01D46/30B01D53/86B01D53/56B01D53/64B01J23/889B01J35/02
CPCB01D39/20B01D46/30B01D53/8628B01D53/8665B01J23/8892B01J35/50
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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