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Flat-plate type sulfur-resistant low-temperature SCR denitration 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 problems such as loss of activity, low activity, and severe corrosion of pipeline equipment

Active Publication Date: 2016-02-03
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 to obtain a clear solution under stirring; another 128.8g of zirconium oxychloride is slowly added to the above cerium nitrate solution; under vigorous stirring, slowly add Ammonia water until the pH value reaches 9, and hydroxide precipitates are obtained and allowed to stand for 24 hours; then the above mixture is filtered, washed, and treated with AgNO 3 The solution was detected to have no precipitation; then placed in an ordinary 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 Ce:Zr molar mass ratio is 1:0.4;

[0028] (2) ① Dissolve 50.0g manganese acetate, 62.5g ferric nitrate and 15.2g ammonium paramolybdate in 40mL deionized water respectively to make its salt solution; The three solutions were added to 200 g of the composite oxide carrier prepared in step (1), ultrasonically treated and allowed to s...

Embodiment 2

[0033] (1) Dissolve 520.8g of cerium nitrate in 6000g of deionized water to obtain a clear solution under stirring; another 193.2g of zirconium oxychloride is slowly added to the cerium nitrate solution; under vigorous stirring, slowly add ammonia water dropwise When the pH value reached 9, the hydroxide precipitate was obtained and allowed to stand for 20 h; then the above mixture was filtered, washed, and treated with AgNO 3 The solution was detected to have no precipitation; then placed in an ordinary 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 Ce:Zr molar mass ratio is 1:0.5;

[0034] (2) ① Dissolve 75.8g manganese acetate, 63.2g ferric nitrate and 30.1g ammonium paramolybdate in 50mL deionized water respectively to make its salt solution; Three kinds of solutions are added to the Ce-ZrO prepared in 240g step (1) 2 In the composite oxide carrier, ultrasonically treat and...

Embodiment 3

[0039] (1) Dissolve 607.6g of cerium nitrate in 8000g of deionized water to obtain a clear solution under stirring; another 360.6g of zirconium oxychloride is slowly added to the cerium nitrate solution; under vigorous stirring, slowly add ammonia water dropwise When the pH value reached 9, hydroxide precipitate was obtained and allowed to stand for 24 h; then the above mixture was filtered, washed, and treated with AgNO 3 The solution was detected to have no precipitation; then it was dried in an ordinary blast drying oven at 105°C for 12h, and roasted in a muffle furnace at 550°C for 3h to obtain nano-Ce-ZrO 2 Composite oxide powder, wherein the Ce:Zr molar mass ratio is 1:0.8;

[0040] (2) ① Dissolve 90.0g manganese acetate, 56.3g ferric nitrate and 22.9g ammonium paramolybdate in 58mL deionized water respectively to make its salt solution; Three kinds of solutions are added to the Ce-ZrO prepared in 300g step (1) 2 In the composite oxide carrier, ultrasonically treat and...

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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 in particular relates to a flat-plate sulfur-resistant low-temperature SCR denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the air pollutants, mainly from coal-fired power plants, vehicle exhaust and industrial boiler emissions. Nitrogen oxides can cause acid rain, photochemical smog and a series of problems that damage the ecological environment and endanger human health. Therefore, effective control of NOx emissions is a key research topic in the field of environmental protection. Among them, ammonia selective catalytic reduction (SCR) has become the most widely used denitrification technology because of its high efficiency and mature technology. [0003] At present, the most widely used SCR flue gas denitrification catalyst is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalyst with high d...

Claims

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Application Information

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Patent Type & Authority Applications(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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