Denitration catalyst and preparation method thereof and flue gas denitration method

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems that flue gas has not undergone desulfurization and dust removal, cannot meet the denitrification requirements, and is easy to lose catalytic activity. Effects of improving low-temperature SCR denitrification activity, regular pore structure, high catalytic activity and selectivity

Pending Publication Date: 2021-12-10
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing industrial applications, most of the flue gas with a temperature of 300-400 ° C has not undergone desulfurization and dust removal.
Therefore, the existing SCR denitrification catalysts in high ash content and high SO 2 easy to lose catalytic activity in the environment
After the flue gas passes through the dust removal and desulfurization devices, its temperature will generally drop below 300°C, and at this temperature, the existing SCR vanadium-titanium catalysts have low activity and cannot meet the industrial denitrification requirements

Method used

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  • Denitration catalyst and preparation method thereof and flue gas denitration method
  • Denitration catalyst and preparation method thereof and flue gas denitration method
  • Denitration catalyst and preparation method thereof and flue gas denitration method

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preparation example Construction

[0034] One embodiment of the present invention proposes a method for preparing a denitration catalyst, which specifically includes the following steps:

[0035] Step S1, UiO-66-NH 2 Powder preparation:

[0036] mixing the zirconium salt, aminoterephthalic acid, templating agent and the third solvent in a molar ratio of 1:0.5-4:0.1-5:50-300;

[0037]The mixed solution is mixed under magnetic stirring for more than 2 hours until the solution is clear and transparent to form a mixture, which is transferred to a polytetrafluoroethylene hydrothermal reaction kettle and reacted at 100-200° C. for 12-48 hours. Centrifuge the obtained solution at high speed or evaporate and filter to obtain a certain amount of powder, then dry the powder in a vacuum oven at 20-80°C for 10-30h, and take it out after cooling to room temperature to obtain UiO-66-NH 2 Powder.

[0038] In this step S1, this method uses zirconium salt as the metal origin, aminoterephthalic acid as the organic skeleton, w...

Embodiment 1

[0070] A preparation method for a MOFs catalyst in the SCR field, specifically comprising the steps of:

[0071] (1)UiO-66-NH 2 Preparation of powder: the ZrOCl of 0.59g 2 , 0.45g of aminoterephthalic acid, 0.9mL of glacial acetic acid and 30mL of N,N-dimethylformamide (DMF) were mixed; the mixed solution was magnetically stirred for 2h until the solution was clear and transparent, and then the solution was transferred to React in a polytetrafluoroethylene reactor at 120°C for 24 hours; centrifuge the reacted solution at 15000r / min, pour out the supernatant, add 20mL DMF and continue centrifuging, repeat this process 2-3 times , the centrifuged solid phase was vacuum-dried in a vacuum oven at 50°C for 12h, and after cooling to room temperature, UiO-66-NH 2 Powder;

[0072] (2) Preparation of vanadyl acetylacetonate solution: Weigh 0.50 g of vanadyl acetylacetonate powder, dissolve it in 30 mL of ethanol, stir magnetically for 2 hours until the solution is completely dissolv...

Embodiment 2

[0076] A preparation method for a MOFs catalyst in the SCR field, specifically comprising the steps of:

[0077] (1) UiO-66-NH 2 Preparation of powder: Weigh 0.79g of zirconium tetrachloride and 0.44g of aminoterephthalic acid, dissolve them in 30mL of N,N-dimethylformamide, and slowly add Add 1 mL of concentrated hydrochloric acid (concentration: 38%) dropwise; magnetically stir the mixed solution for 2.5 h until the solution is clear and transparent, then transfer the solution to a polytetrafluoroethylene reactor and react for 48 h at 100°C; The solution was centrifuged at 12000r / min, poured out the supernatant, added 30mL DMF, and continued centrifugation. After repeating this process 2-3 times, the centrifuged solid phase was vacuum-dried in a vacuum oven at 30°C for 28h. UiO-66-NH was obtained after cooling to room temperature 2 Powder;

[0078] (2) Preparation of vanadyl sulfate solution: Weigh 0.8 g of vanadyl sulfate powder, dissolve it in 50 mL of water, stir the s...

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Abstract

The invention relates to a denitration catalyst and a preparation method thereof and a flue gas denitration method. The preparation method of the denitration catalyst comprises the following steps: (1) preparing a UiO-66-NH2 solution by taking UiO-66-NH2 powder as a raw material; and (2) adding a vanadium-containing precursor solution into the UiO-66-NH2 solution to ensure that the molar ratio of vanadium in the vanadium-containing precursor to UiO-66-NH2 is (1-10):1, reacting for 12-48 hours under the water bath condition of 60-100 DEG C, and separating and drying the reacted solution to obtain the UiO-66-NH2-V catalyst. According to the UiO-66-NH2-V catalyst prepared by the preparation method disclosed by the invention, UiO-66-NH2 is used as a metal organic framework material, and the structure of the UiO-66-NH2-V catalyst is stable; vanadium sites in the catalyst are uniformly distributed, so that the catalytic activity of the catalyst is improved; and the UiO-66-NH2-V catalyst prepared by the method disclosed by the invention can be used for flue gas denitration, and still has relatively high catalytic activity at a low temperature.

Description

technical field [0001] The invention relates to the field of chemical industry catalysis, in particular to a denitration catalyst, a preparation method thereof and a flue gas denitration method. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. It will not only cause a series of problems such as acid rain and photochemical smog that destroy the earth's ecological environment, but also seriously endanger human health. Selective Catalytic Reduction (SelectiveCatalytic Reduction, SCR) is one of the effective flue gas denitrification technologies, and the catalyst is the key to the denitrification technology. [0003] At present, the most widely used SCR denitration catalyst is a vanadium-titanium catalyst. This product is a metal oxide catalyst based on anatase titanium dioxide as a carrier, loaded with vanadium oxide as an active material, and supplemented with tungsten oxide or molybdenum oxide as a cocatalyst. , which ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/10B01D53/56B01D53/86B01D53/90
CPCB01J31/1691B01J35/0066B01J35/1004B01D53/8628B01D53/90B01J2531/56B01D2257/404B01D2258/0283Y02C20/30
Inventor 陈琛梁海龙陈鑫吴彦霞胡利明陈玉峰
Owner CHINA BUILDING MATERIALS ACAD
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