Powdery denitration catalyst and preparation method thereof

A denitration catalyst, powder technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc. and other problems, to achieve the effect of low one-time investment in equipment, prevention of corrosion, and reduction of NH3

Pending Publication Date: 2019-12-03
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kong Xuebiao and others improved the denitrification efficiency by improving the low-nitrogen burner, but the denitrification efficiency can only reach about 50%. Some people can only meet 100mg / m through low-nitrogen combustion plus SNCR denitrification technology 3 However, it is still unable to achieve ultra-low emissions, and there is serious ammonia escape, causing secondary environmental pollution and equipment corrosion
SCR denitrification technology, the denitrification efficiency can be greater than 90%. Although it is widely used in the power industry for ultra-low emissions, the high-alkali dust in the cement industry will easily poison and deactivate the catalyst, and the high dust will easily block the catalyst, so it is difficult to be applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] (1) Preparation of active components

[0021] After getting 2355.54g ferric nitrate nonahydrate and roasting under air atmosphere, the roasting temperature is 500°C, the time is 2h, and the hydrogen atmosphere is treated for 45min; 144.25g manganese nitrate tetrahydrate is roasted under air atmosphere; the roasting temperature is 500°C, and the time is 2h; wherein the mass ratio of ferric oxide and manganese dioxide is 9:1;

[0022] (2) Preparation of additives

[0023] Take 265.64g of lanthanum nitrate hexahydrate, 252.32g of cerium nitrate hexahydrate, and 115.97g of erbium nitrate pentahydrate and roast them in an air atmosphere at a temperature of 500°C for 2 hours; take 500g of alumina powder, 500g of silicon oxide powder, and 200g of Calcium powder, 0.005g nano-gold and 0.005g platinum are mixed evenly;

[0024] (3) Preparation of Monolithic Catalyst

[0025] Mix the active components and additives prepared above with 3000g of activated carbon, 2000g of melamin...

example 2

[0029] (1) Preparation of active components

[0030] Get 785.16g ferric nitrate nonahydrate and roast under air atmosphere, roasting temperature is 500 ℃, time is 3h, hydrogen atmosphere handles 35min; Get 432.76g manganese nitrate tetrahydrate roasting under air atmosphere; roasting temperature is 600 ℃, time is 3h; wherein the mass ratio of ferric oxide and manganese dioxide is 1:1;

[0031] (2) Preparation of additives

[0032] Take 106.26g of lanthanum nitrate hexahydrate, 151.40g of cerium nitrate hexahydrate, 57.98g of erbium nitrate pentahydrate and roast in air atmosphere at a temperature of 600°C for 3 hours; take 300g of alumina powder, 300g of silicon oxide powder, 50g of oxide Calcium powder, 0.0005g nano-gold and 0.0005g platinum are mixed evenly;

[0033] (3) Preparation of Monolithic Catalyst

[0034] The above-mentioned active component and auxiliary agent are mixed with 50g of activated carbon and 150g of urea, and fully ball milled to 20-80 mesh; a new typ...

example 3

[0038] (1) Preparation of active components

[0039] Get 1046.91g ferric nitrate nonahydrate and roast under air atmosphere, the roasting temperature is 600 ℃, time is 2h, hydrogen atmosphere treatment 40min; Get 57.70g manganese nitrate tetrahydrate roasting under air atmosphere; roasting temperature is 500 ℃, time is 2h; wherein the mass ratio of ferric oxide and manganese dioxide is 10:1;

[0040] (2) Preparation of additives

[0041] Take 26.56g of lanthanum nitrate hexahydrate and 50.46g of cerium nitrate hexahydrate and roast in air atmosphere at a temperature of 500°C for 2 hours; take 100g of alumina powder, 50g of silicon oxide powder, 0.0005g of nano-gold and 0.0005g of platinum and mix evenly ;

[0042] (3) Preparation of Monolithic Catalyst

[0043] Mix the active component and auxiliary agent prepared above with 300g melamine, 100g glucose, and 200g urea, and fully ball mill to 20-80 mesh; obtain a new type of powder denitration catalyst, wherein the active com...

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PUM

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Abstract

The invention relate to a novel powdery denitration catalyst and a preparation method thereof. The novel powdery denitration catalyst is characterized by being prepared from the components in percentage by weight: 5-30% of active components, 15-50% of an assistant and 20-80% of an additive, wherein the active components are an oxide of Fe and an oxide of Mn, the assistant is one or more of oxidesof Ce, La, Er, Si, Al, Ca and Ti, and Au or Pt, and the additive is a mixture of one or two of active carbon or urea and one or two of melamine or glucose. The roasted active components, assistant andadditive are fully mixed and ball-milled, and the novel powdery denitration catalyst is prepared. The novel powdery denitration catalyst is environmental friendly in component, NO<x> removal activitytemperature is high, the window is wide, and denitration can be effectively achieved within the temperature range of 700-1200 DEG C.

Description

technical field [0001] The invention relates to a novel powdery denitrification catalyst and a preparation method thereof, belonging to the fields of environmental protection catalytic materials and air pollution control. Background technique [0002] Nitrogen oxides are one of the important causes of smog and acid rain, and the cement industry is the main NOx x Stationary sources of emissions are also the focus of air pollution control. Due to the lack of efficient and practical denitrification technology, the cement industry currently emits NO x Emission in general area is 400mg / m 3 , 320mg / m in key areas 3 standard. And the power industry has implemented NO x Emission in general area is 50mg / m 3 , 25mg / m in key areas 3 standard. With the increasing pressure of environmental protection, the cement industry NO x The emission standard will be implemented at 100mg / m 3 , ultra-low emissions have been implemented in some areas, requiring less than 50mg / m 3 . However...

Claims

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Application Information

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IPC IPC(8): B01J31/32B01D53/86B01D53/56
CPCB01J31/32B01D53/8628B01J2523/00
Inventor 祝社民李喜红陶兴军金奇杰
Owner NANJING UNIV OF TECH
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