Novel core-shell structure catalyst for synergistic denitration and demercuration and preparation method ofnovel core-shell structure catalyst

A core-shell structure and catalyst technology, which is applied in the field of new core-shell structure catalysts and preparations for synergistic denitration and demercuration, can solve the problems of increasing the denitrification cost of enterprises, shortening the service life of catalysts, soil and groundwater pollution, etc., and achieving good low temperature Effects of denitrification activity, catalyst activity improvement, and excellent environmental protection

Inactive Publication Date: 2021-01-15
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its active component V 2 o 5 Toxic and soluble in water, it will pollute the soil and groundwater
The post-processing of spent catalysts will increase the post-denitrification cost of enterprises
In addition V 2 o 5 Has a strong oxidation rate, which will increase the SO in the denitrification process 2 convert to SO 3 conversion rate, so that more ammonium sulfate salts are generated during the reaction process, resulting in catalyst deactivation, shortening the service life of the catalyst, and causing corrosion to the equipment, increasing the maintenance cost of the enterprise's equipment

Method used

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  • Novel core-shell structure catalyst for synergistic denitration and demercuration and preparation method ofnovel core-shell structure catalyst
  • Novel core-shell structure catalyst for synergistic denitration and demercuration and preparation method ofnovel core-shell structure catalyst
  • Novel core-shell structure catalyst for synergistic denitration and demercuration and preparation method ofnovel core-shell structure catalyst

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Experimental program
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Effect test

Embodiment 1

[0049] This embodiment discloses the preparation method of the novel core-shell catalyst for synergistic denitration and demercuration of the present invention, specifically as follows:

[0050] Step 1. Preparation of α-MnO 2 nanorod particles

[0051] 72.70g of 50% potassium permanganate (KMnO 4 ) solution, 58.32g of manganese sulfate were added to 200mL of deionized water, then 2mL of concentrated sulfuric acid (98wt%) was added, and the above solution was stirred at room temperature until it was completely dissolved, then the solution was transferred to a polytetrafluoroethylene tank, and the polytetrafluoroethylene After the tetrafluoroethylene tank was sealed, it was placed in an oven at 80°C for constant temperature reaction for 12 hours. After the reaction is complete, the polytetrafluoroethylene tank is naturally cooled to room temperature, and the solid sediment in the tank is centrifuged and washed three times with deionized water and ethanol alternately until the ...

Embodiment 2

[0058] This example discloses the preparation method of the novel core-shell catalyst for synergistic denitration and demercuration of the present invention. Step 1 and step 2 of this embodiment are the same as in embodiment 1, only step 3 is different, specifically:

[0059] Step 1-2: same as embodiment 1;

[0060] Step 3. Preparation of CeO 2 -MnO 2 @TiO 2 Powder:

[0061] 319.05g of tetrabutyl titanate was dissolved in 478.58g of absolute ethanol, according to the titration rate of 10mL / min, 75g of 10% ammonia water was added to the mixed solution, and 52.63g of CeO 2 -MnO 2 Add the powder to the above solution, and stir at a constant speed of 300r / min throughout the process; transfer the suspension to a polytetrafluoroethylene tank, seal the polytetrafluoroethylene tank, and put it in an oven at 80°C for 12 hours of constant temperature reaction.

[0062] After the reaction is complete, naturally cool the polytetrafluoroethylene tank to room temperature, and centrifu...

Embodiment 3

[0064] This example discloses the preparation method of the novel core-shell catalyst for synergistic denitration and demercuration of the present invention. In this embodiment, step 1 and step 2 are the same as in embodiment 1, only step 3 is different, specifically:

[0065] Step 1-2: same as embodiment 1;

[0066] Step 3. Preparation of CeO 2 -MnO 2 @TiO 2 powder

[0067] Dissolve 425.4g of tetrabutyl titanate in 638.1g of absolute ethanol, add 100g of 10% ammonia water to the mixed solution according to the titration rate of 10mL / min, and dissolve 52.63g of CeO 2 -MnO 2 Add the powder to the above solution, and stir at a constant speed of 300r / min throughout the process; transfer the suspension to a polytetrafluoroethylene tank, seal the polytetrafluoroethylene tank, and put it in an oven at 80°C for 12 hours of constant temperature reaction.

[0068] After the reaction is complete, naturally cool the polytetrafluoroethylene tank to room temperature, and centrifugall...

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Abstract

The invention discloses a novel core-shell structure catalyst for synergistic denitration and demercuration and a preparation method of a novel core-shell structure catalyst and belongs to the technical field of chemical environment-friendly catalysts. According to the core-shell structure catalyst disclosed by the invention, nanoscale TiO2 is used as a catalyst shell, and an alpha-MnO2 nanorod loaded with CeO2 is used as an inner core. The preparation method comprises the following steps of: by taking potassium permanganate and manganese sulfate as raw materials, preparing alpha-MnO2 nanorodparticles by adopting a hydrothermal method; loading CeO2 on the alpha-MnO2 nanorod particles by adopting an excessive impregnation method, so as to prepare CeO2-MnO2 particles; and wrapping the CeO2-MnO2 particles with the nanoscale TiO2 by adopting a hydrothermal method, so as to prepare the catalyst. The novel core-shell type catalyst for simultaneous denitration and demercuration still has relatively strong capability of catalyzing mercury oxidation under the condition that HCl does not exist in flue gas, and also has good low-temperature denitration activity.

Description

technical field [0001] The invention belongs to the technical field of chemical environmental protection catalysts, and in particular relates to a novel core-shell structure catalyst for synergistic denitration and demercuration and a preparation method thereof. Background technique [0002] As the world's largest coal producer and consumer, China's annual coal consumption accounts for more than 50% of the world's total coal, and it is expected that my country's coal-based energy structure will not undergo fundamental changes for a long time to come. . As the main source of coal consumption, coal-fired power plants are accompanied by many air pollutants during their work, among which nitrogen oxides and mercury emissions are extremely harmful to the ecological environment and human health. [0003] As the world's largest man-made mercury emitter, my country's emissions account for about 25% to 40% of the world's considered emissions, and coal-fired power plants are one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/02B01D53/86B01D53/56B01D53/64
CPCB01D53/8628B01D53/8665B01J23/002B01J23/34B01J35/0073B01J35/023B01J35/026B01J2523/00B01J2523/3712B01J2523/47B01J2523/72
Inventor 王蕾张向辉赵安民黄晨贺安平彭颖娟
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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