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Denitration catalyst with high sulfur resistance and high alkali metal resistance, and preparation method thereof

A denitration catalyst, alkali metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. It can make up for the problems of poor temperature and good denitrification efficiency and stability.

Pending Publication Date: 2020-01-24
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of narrow temperature window, poor alkali metal resistance, poor sulfur resistance, N 2 Poor selectivity and other defects provide a new denitrification catalyst and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 362.12g of tetrabutyl titanate and 52.05g of tetraethyl silicate were added to 300g of absolute ethanol and stirred evenly to obtain mixed solution A; 1.07g of vanadyl sulfate and 0.96g of neodymium nitrate were dissolved in 60g of Stir uniformly in water ethanol to obtain solution B; dissolve 0.88g cerium nitrate and 0.2g ammonium molybdate in 5g oxalic acid solution (mass concentration 5%) and mix uniformly to obtain solution C; slowly pour B solution into A solution, Stir evenly and let it stand for no less than 30 minutes; slowly add solution C to the mixed solution of A and B, stir evenly, age for 2 hours at a temperature of 50°C to obtain a gel;

[0023] (2) Dry and grind the obtained gel under a nitrogen atmosphere to obtain a precursor;

[0024] (3) Weigh 90g of the precursor, mix it with 20% concentrated ammonia solution, and stir it magnetically for 6h.

[0025] (4) Transfer the suspension in (3) into a high-temperature and high-pressure reaction kettle, and ...

Embodiment 2

[0030] A certain amount of 404.63g tetrabutyl titanate and 17.34g tetraethyl silicate were respectively added to 320g of absolute ethanol and stirred evenly to obtain a mixed solution A; 7.16g of vanadyl sulfate and 2.40g of neodymium nitrate were dissolved in Stir in 80g of absolute ethanol to prepare solution B; dissolve 22.7g of cerium nitrate and 1.36g of ammonium molybdate in 55g of oxalic acid solution (mass concentration 8%) and mix evenly to obtain solution C; slowly pour B solution into A In the solution, stir evenly, and let stand for no less than 30 minutes; slowly add solution C to the mixed solution of A and B, stir evenly, and age for 12 hours at a temperature of 90°C to obtain a gel;

[0031] (2) Dry and grind the obtained gel under a nitrogen atmosphere to obtain a precursor;

[0032] (3) Weigh 100 g of the precursor, mix it with 25% concentrated ammonia solution, and stir it magnetically for 8 hours.

[0033] (4) Transfer the suspension in (3) into a high-tem...

Embodiment 3

[0038] 383.34g of tetrabutyl titanate and 34.68g of tetraethyl silicate were added to 450g of absolute ethanol and stirred uniformly to obtain mixed solution A; 3.76g of vanadyl sulfate and 2.15g of neodymium nitrate were dissolved in 65g of Stir uniformly in water ethanol to obtain solution B; dissolve 16.14g cerium nitrate and 2.18g ammonium molybdate in 80g oxalic acid solution (mass concentration 10%) and mix uniformly to obtain solution C; slowly pour B solution into A solution, Stir evenly, and let stand for no less than 30 minutes; slowly add solution C to the mixed solution of A and B, stir evenly, and age for 12 hours at a temperature of 90°C to obtain a gel;

[0039] (2) Dry and grind the obtained gel under a nitrogen atmosphere to obtain a precursor;

[0040] (3) Weigh 90g of the precursor, mix it with 22% concentrated ammonia solution, and stir it magnetically for 8h.

[0041](4) Transfer the suspension in (3) into a high-temperature and high-pressure reaction ket...

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Abstract

The invention discloses a denitration catalyst with high sulfur resistance and high alkali metal resistance, and a preparation method thereof. The catalyst is prepared by taking tetrabutyl titanate and tetraethyl silicate as carrier precursors, vanadyl sulfate and neodymium nitrate as active component precursors and cerium nitrate and ammonium molybdate as assistant precursors through centrifuging, drying and calcining by adopting a sol-gel process and a coprecipitation process. The prepared denitration catalyst with high sulfur resistance and high alkali metal resistance effectively overcomesthe defects of narrow temperature window, poor alkali metal resistance and poor sulfur resistance of a traditional denitration catalyst. When the temperature is 150-450 DEG C, the air speed is 1000-100000 h<-1>, the SO2 concentration is 0-3000 mg / m<3>, and the K2O concentration of the catalyst is 0-1.5%, the catalyst has an excellent denitration efficiency and an excellent N2 selectivity, and issuitable for nitrogen oxide emission control under flue gas conditions of a coal-fired power plant, a coking plant, a glass kiln, a cement kiln and the like.

Description

technical field [0001] The invention relates to an SCR catalyst and a preparation method, in particular to a denitrification catalyst with strong sulfur resistance and alkali metal resistance and a preparation method, belonging to the technical field of air pollution control. Background technique [0002] Selective catalytic reduction (SCR) technology is the mainstream technology of coal-fired boiler denitrification engineering, and has been widely used in coal-fired power plants in my country. By the end of 2018, about 810 million kilowatts of coal-fired power units had reached the ultra-low emission limit nationwide, accounting for 80% of the total installed capacity of coal power in the country; a total of 650 million kilowatts of energy-saving renovations had been completed, and the renovation target for 2020 was completed ahead of schedule, which is of great significance and also It represents that my country's environmental protection work has reached a new level, enter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56
CPCB01J23/002B01J23/28B01D53/8628B01J2523/00B01D2258/0283B01J2523/14B01J2523/3712B01J2523/41B01J2523/47B01J2523/55B01J2523/68
Inventor 纵宇浩黄力常峥峰王虎秦婷婷
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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