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A catalyst for denitration and demercuration of flue gas and its preparation method

A catalyst and denitration technology, applied in the field of air pollution control, can solve the problems of the influence of zero-valent mercury oxidation activity, poor mercury oxidation effect, and poor catalyst sulfur resistance, and achieve low SO2 oxidation performance, strong industrial application value, and reduced oxygen The effect of bridge density

Active Publication Date: 2022-04-12
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are denitrification and mercury removal catalysts on the market, but the catalysts in the prior art are rarely suitable for industrial applications, or the catalysts have poor sulfur resistance, or the zero-valent mercury oxidation activity is greatly affected by the smoke temperature components. Under actual flue gas conditions, the mercury oxidation effect is not good, and it cannot meet the actual actual needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) N, P, Cl modified TiO 2 -MoO 3 Preparation of vector

[0023] a. Weigh 0.3g of urea, 0.30g of ammonium dihydrogen phosphate, and 0.11g of ammonium chloride and dissolve them in 20ml of deionized water to make a solution, and add 2ml of glacial acetic acid;

[0024] b. Nano-TiO 2 -MoO 3 Add powder to step (a), wherein the mass of molybdenum oxide is 1%, stir evenly, make a paste with a water content of 30%, put it into the reaction kettle, the temperature of the reaction kettle is 125°C, and keep it warm for 10h;

[0025] c. Calcinate the paste completed in (b) at 400°C for 10h, and grind it to obtain modified TiO 2 -MoO 3 carrier powder.

[0026] (2) V-Y-Sn-Zr-O X Preparation of active ingredients

[0027] a. Weigh 0.79g of ammonium metavanadate and 0.55g of oxalic acid, dissolve them in deionized water to make solution (I); mix 0.06g of yttrium nitrate, 0.11g of tin tetrachloride, and 0.05g of zirconium oxychloride at the same time Dissolve in deionized wa...

Embodiment 2

[0035] (1) N, P, Cl modified TiO 2 -MoO 3 Preparation of vector

[0036] a. Weigh 5.10g of urea, 9.77g of ammonium dihydrogen phosphate, and 2.73g of ammonium chloride and dissolve them in 50ml of deionized water to make a solution, and add 50ml of glacial acetic acid;

[0037] b. Nano-TiO 2 -MoO 3 Add powder to step (a), wherein the mass of molybdenum oxide is 1%, stir evenly, make a paste with a water content of 45%, put it into the reaction kettle, the temperature of the reaction kettle is 175 ° C, and keep it warm for 3 hours;

[0038] c. Calcinate the paste completed in (b) at 600°C for 2h, and grind it to obtain modified TiO 2 -MoO 3 carrier powder.

[0039](2) V-Y-Sn-Zr-O X Preparation of active ingredients

[0040] a. Weigh 0.08g of ammonium metavanadate and 0.16g of polyethanolamine, dissolve them in deionized water to make a solution (I); mix 0.84g of yttrium nitrate, 0.07g of tin tetrachloride, and 0.535g of zirconium oxychloride Dissolve in deionized water...

Embodiment 3

[0048] (1) N, P, Cl modified TiO 2 -MoO 3 Preparation of vector

[0049] a. Weigh 4.90g of urea, 9.38g of ammonium dihydrogen phosphate, and 2.61g of ammonium chloride and dissolve them in 30ml of deionized water to make a solution, and add 5ml of glacial acetic acid;

[0050] b. Nano-TiO 2 -MoO 3 Add powder to step (a), wherein the mass of molybdenum oxide is 5%, stir evenly, make a paste with a water content of 40%, put it into the reaction kettle, the temperature of the reaction kettle is 155°C, and keep it warm for 5h;

[0051] c. Calcinate the paste completed in (b) at 500°C for 2h, and grind it to obtain modified TiO 2 -MoO 3 carrier powder.

[0052] (2) V-Y-Sn-Zr-O X Preparation of active ingredients

[0053] a. Weigh 1.25g of ammonium metavanadate and 1.2g of polyethanolamine, dissolve them in deionized water to make a solution (I); mix 4.71g of yttrium nitrate, 1.1g of tin tetrachloride, and 7.93g of zirconium oxychloride Dissolve in deionized water at the sa...

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PUM

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Abstract

The invention provides a flue gas denitrification and mercury removal catalyst and a preparation method thereof, belonging to the technical field of air pollution control. The catalyst includes N, P, Cl modified nano-TiO 2 -MoO 3 powder as carrier, load V‑Y‑Sn‑Zr‑O X As the active component, starch and activated carbon are added to modify the micropores, and the catalyst for denitrification and demercuration is obtained by blending, aging, drying and calcining. The denitrification and mercury removal catalyst prepared by the present invention has higher denitrification activity, mercury oxidation performance, and better anti-SO 2 And water resistance, suitable for emission control of denitrification and demercuration of fixed source flue gas such as thermal power plants and coking plants.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a denitrification and mercury removal catalyst for flue gas and a preparation method thereof. Background technique [0002] China is a big coal consumer, with coal consumption reaching 3.779×10 in 2016 9 t, of which about 50% is used for power generation. There are many main types of coal in my country, and their average mercury content varies greatly, and they are all higher than the average mercury content in coal combustion in the world (0.13 mg / kg). Mercury compounds in coal (pyrite (FeS 2 ) and cinnabar (HgS), etc.) with the combustion of coal, the formation of Hg 0 let go. Hg 0 It is considered to be the most difficult and the most important control object. Hg 0 With a high vapor pressure (0.18Pa), it is easy to enter the atmosphere through volatilization and diffusion. With high surface tension, it is very easy to gather into small water droplets and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/56B01D53/64
CPCB01J27/24B01D53/8628B01D53/8665B01D2257/602B01D2258/0283
Inventor 纵宇浩秦婷婷黄力常铮峰王虎于洋
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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