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A kind of flat type anti-sulfur low-temperature SCR denitrification catalyst and preparation method thereof

A denitration catalyst, a flat-plate technology, used in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of severe corrosion of pipeline equipment, low activity, loss of activity, etc.

Active Publication Date: 2018-06-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercial SCR denitration catalysts have low activity in flue gas < 150°C, so the development of low-temperature SCR denitration catalysts with high activity is the core of the low-temperature denitration field
Among the many low-temperature and high-activity denitration catalysts developed, manganese-based catalysts have received the most attention, such as MnOx (manganese oxide) / TiO 2 , MnOx (manganese oxide) / Al 2 o 3 It has high denitrification activity at 100-150°C, but these catalysts have poor resistance to sulfur dioxide poisoning and lose their activity quickly in flue gas
At the same time, the existence of the catalyst oxidizes the sulfur dioxide in the flue gas into sulfur trioxide, which seriously corrodes the pipeline equipment
Therefore, there are still great limitations in the industrial application of manganese-based denitrification catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 434.0g of cerium nitrate in 4400g of deionized water, and obtain a clear solution under stirring; add another 128.8g of zirconium oxychloride to the above solution of cerium nitrate; slowly add dropwise under vigorous stirring Ammonia water reaches pH 9 to get the hydroxide precipitate and let it stand for 24h; then the above mixture is filtered, washed, and AgNO 3 The solution is detected until no precipitation is produced; then it is placed in a common blast drying oven at 110°C for 12 hours, and in a muffle furnace at 550°C for 3 hours to obtain nano-Ce-ZrO 2 Composite oxide powder, wherein the molar mass ratio of Ce:Zr is 1:0.4;

[0028] (2) ① Dissolve 50.0g of manganese acetate, 62.5g of ferric nitrate and 15.2g of ammonium paramolybdate in 40mL of deionized water to prepare its salt solution; then add manganese acetate, ferric nitrate and ammonium paramolybdate in the order The three solutions were added to 200g of the composite oxide carrier prepared in ...

Embodiment 2

[0033] (1) Dissolve 520.8g of cerium nitrate in 6000g of deionized water, and obtain a clear solution under stirring conditions; add another 193.2g of zirconium oxychloride to the cerium nitrate solution slowly; under vigorous stirring, slowly add ammonia water dropwise When the pH value reaches 9, get the hydroxide precipitate and let it stand for 20h; then the above mixture is filtered, washed, and AgNO 3 The solution is detected until no precipitation is produced; then it is placed in a common blast drying oven at 110°C for 12 hours, and in a muffle furnace at 550°C for 3 hours to obtain nano-Ce-ZrO 2 Composite oxide powder, wherein the molar mass ratio of Ce:Zr is 1:0.5;

[0034] (2) ① Dissolve 75.8g of manganese acetate, 63.2g of ferric nitrate and 30.1g of ammonium paramolybdate in 50mL of deionized water to prepare its salt solution; then mix the manganese acetate, ferric nitrate and ammonium paramolybdate in the order Three solutions were added to 240g Ce-ZrO prepared in s...

Embodiment 3

[0039] (1) Dissolve 607.6g of cerium nitrate in 8000g of deionized water, and obtain a clear solution under stirring conditions; add another 360.6g of zirconium oxychloride to the cerium nitrate solution slowly; under vigorous stirring, slowly add ammonia water dropwise When the pH value reaches 9, get the hydroxide precipitate and let it stand for 24h; then filter, wash, and use AgNO 3 The solution is detected until no precipitation occurs; then it is placed in a common blast drying oven at 105°C for 12 hours, and in a muffle furnace at 550°C for 3 hours to obtain nano-Ce-ZrO 2 Composite oxide powder, wherein the molar mass ratio of Ce:Zr is 1:0.8;

[0040] (2) ①Respectively dissolve 90.0g manganese acetate, 56.3g ferric nitrate and 22.9g ammonium paramolybdate in 58mL deionized water to prepare its salt solution; then combine manganese acetate, ferric nitrate and ammonium paramolybdate in the order Three solutions were added to 300g Ce-ZrO prepared in step (1) 2 In the composite...

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Abstract

The invention specifically relates to a flat-plate type sulfur-resistant low-temperature SCR denitration catalyst and a preparation method thereof, belonging to the fields of environmental protection and environmental catalysis. The method comprises the following steps: with nanometer composite oxide Ce-ZrO2 as a carrier, manganese oxide as an active component and iron oxide and molybdenum oxide as cocatalysts, carrying out equivalent-volume impregnation, drying, roasting and crushing so as to prepare a powdery catalyst; and subjecting the prepared powdery catalyst to acidification by sulfuric acid and then carrying out mixing, rolling coating, fold pressing, shearing, drying and roasting so as to obtain the flat-plate type sulfur-resistant low-temperature SCR denitration catalyst. The prepared catalyst has denitration activity of 85 to 98% in a temperature range of 80 to 150 DEG C and has excellent resistance to sulfur dioxide poisoning.

Description

Technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and specifically relates to a flat-plate anti-sulfur low-temperature SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the air pollutants, mainly from coal-fired power plants, automobile exhaust, and industrial boiler emissions. Nitrogen oxides can cause a series of problems such as acid rain and photochemical smog that damage the ecological environment and endanger human health. Therefore, effective control of NOx emissions is currently a key research topic in the field of environmental protection. Among them, ammonia selective catalytic reduction (SCR) has become the most widely used denitration technology due to its high efficiency and mature technology. [0003] At present, the most widely used SCR flue gas denitration catalyst in industry is V 2 O 5 -WO 3 (MoO 3 ) / TiO 2 The catalyst has high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 陆强黎方潜蔺卓玮唐昊马帅董长青
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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