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A denitrification catalyst for improving anti-arsenic poisoning performance and its preparation method and application

A denitrification catalyst and arsenic poisoning technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems affecting catalyst activity, selectivity and temperature window , to achieve the effect of improving anti-arsenic poisoning performance, low cost, and improving anti-arsenic poisoning performance

Active Publication Date: 2021-06-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the anti-arsenic poisoning performance of the catalyst is often improved by adding molybdenum oxide. However, the addition of molybdenum oxide will significantly affect the activity, selectivity and temperature window of the catalyst.

Method used

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  • A denitrification catalyst for improving anti-arsenic poisoning performance and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Preparation of VWMgTi catalyst.

[0022] (1) 0.13g of ammonium metavanadate, 0.86g of ammonium metatungstate, 2g of oxalic acid and 1.1g of magnesium nitrate were dissolved in 100mL of deionized water and stirred to obtain a precursor solution;

[0023] (2) Add 9 g of titanium dioxide to the precursor solution in step (1), and stir at room temperature for 120 min to obtain a slurry;

[0024] (3) heating and stirring the slurry at 100° C., gradually evaporating the water in the slurry to obtain a solid;

[0025] (4) The solid substance obtained in step (3) is washed and filtered with deionized water several times, and then dried overnight at 110° C. to obtain a semi-finished product;

[0026] (5) Put the semi-finished product obtained in step (4) into a muffle furnace for roasting. The calcination conditions are as follows: in an air atmosphere, the temperature is raised from room temperature to 500° C. at a rate of 2° C. / min and kept for 4 hours to obtain ...

Embodiment 2

[0027] Example 2 Preparation of VWBaTi catalyst.

[0028] (1) 0.13g of ammonium metavanadate, 0.86g of ammonium metatungstate, 2g of oxalic acid and 0.34g of barium nitrate were dissolved in 100mL of deionized water and stirred to obtain a precursor solution;

[0029] (2) Add 9 g of titanium dioxide to the precursor solution in step (1), and stir at room temperature for 120 min to obtain a slurry;

[0030] (3) heating and stirring the slurry at 100° C., gradually evaporating the moisture in the slurry to obtain a solid;

[0031] (4) The solid material obtained in step (3) is washed and filtered with deionized water several times, and then dried overnight at 110° C. to obtain a semi-finished product;

[0032] (5) Putting the semi-finished product obtained in step (4) into a muffle furnace for roasting to obtain an anti-arsenic poisoning vanadium-tungsten-barium-titanium catalyst.

[0033] The firing conditions are as follows: in air atmosphere, the temperature is raised fr...

Embodiment 3

[0034] Example 3 Preparation of CeWMg catalyst.

[0035] (1) Dissolve 8.68g of cerium nitrate, 7.605g of ammonium tungstate, 2g of oxalic acid and 4.6g of magnesium nitrate in 100mL of deionized aqueous solution and stir to mix;

[0036] (2) Ammonia water with a concentration of 25 wt% was added dropwise to the solution in step (1), controlled at pH=11, and stirred at room temperature for 120 min to fully precipitate;

[0037] (3) Suction filter the precipitate obtained in step (2), and wash it with deionized water several times, and then dry it overnight at 110° C. to obtain a semi-finished product;

[0038] (4) Put the semi-finished product obtained in step (3) into a muffle furnace, and raise it from room temperature to 500°C at a rate of 2°C / min in an air atmosphere and keep it for 4h to prepare an anti-arsenic poisoning cerium-tungsten-magnesium catalyst .

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Abstract

The invention discloses a denitrification catalyst for improving arsenic poisoning resistance and a preparation method thereof, belonging to the technical fields of environmental protection and catalysts. The invention obtains a new denitration catalyst by introducing an anti-arsenic auxiliary agent in the preparation process of the denitration catalyst, effectively improves the chemical stability of the existing vanadium-based and cerium-based catalysts, and is used for fixed source denitrification. After testing, after adding anti-poisoning elements, the denitrification activity of the simulated poisoned catalyst under arsenic-containing conditions is significantly improved compared with that of the fresh catalyst, and the NO conversion rate can rise from 35% at 300°C to more than 78%. The optimal NO conversion rate can be As high as 88%; and whenever the temperature rises to 400°C, the NO conversion rate further increases to 90%. The optimal anti-arsenic additive is magnesium salt, which improves the anti-arsenic poisoning performance of the catalyst through the synergistic effect of Mg and As, and greatly avoids the influence of the addition of components on the temperature window and activity.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and catalysts, in particular to a denitrification catalyst for improving arsenic poisoning resistance and a preparation method thereof, and the application of the catalyst in the field of nitrogen oxide purification. Background technique [0002] Nitrogen oxides (NO x , mainly including NO and NO 2 ), not only constitute the important precursor of secondary organic aerosols (Secondary Organic Aerosols, SOA) in PM2.5, but also can generate secondary pollutants such as O3 through a series of photochemical reactions, leading to the occurrence of photochemical smog events. Therefore, vigorously reducing the emission of nitrogen oxides is of great significance to the improvement of regional air quality in my country. Among the 18.519 million tons of nitrogen oxide emissions in my country (2015), stationary source NOx emissions represented by the power industry and industrial boilers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J23/888B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/30B01J23/888Y02C20/10
Inventor 李想
Owner BEIHANG UNIV
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