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Method for preparing self-regeneration long-acting high-activity denitration catalysts

A denitrification catalyst, high activity technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problems of small specific surface area, shorten the service life of catalyst, poor denitrification activity of catalyst, etc., achieve large specific surface area, Increase the adhesion firmness and the effect of many internal channels

Inactive Publication Date: 2017-08-11
蒋春霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: the current denitrification catalyst has a small specific surface area and few internal pores, which leads to poor denitrification activity of the catalyst, and after the catalyst is worn and broken to a certain extent, the catalyst needs to be replaced, thereby shortening To solve the problem of the service life of the catalyst, a preparation method of a self-renewing long-term high-activity denitration catalyst is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Weigh 1 kg of basalt and put it into a stone crusher for crushing for 20 minutes to obtain thick basalt blocks and put them into gauze bags, put the gauze bags at the bottom of the fermentation tank, and mix pig manure and biogas liquid at a mass ratio of 1:5 to obtain Mixed solution, and then put the obtained mixed solution into a fermenter until the gauze bag is completely submerged, seal the fermenter, and ferment at 35°C for 20 days; Immediately spray and freeze with liquid nitrogen for 5 minutes, put the frozen basalt block into a ball mill and grind for 1 hour and pass through a 200-mesh steel sieve to obtain sieved basalt powder; weigh 18g iron nitrate, 12g nickel nitrate, 11g copper nitrate and Dissolve 3g of palladium nitrate in 900mL of absolute ethanol to obtain a mixed impregnating solution. Mix the sieved basalt powder and 10% acetic acid in a mass ratio of 1:10, shake the shaker for 7 hours, and filter to obtain pretreatment after shaking. Basalt powder: i...

example 2

[0023]Weigh 2 kg of basalt and put it into a stone crusher for 30 minutes to crush it to obtain a thick block of basalt and put it into a gauze bag. Mixed solution, then add sodium thiosulfate with 10% pig manure mass to the mixed solution to reduce the dissolved oxygen content in the mixed solution, optimize the anaerobic environment in the fermentation tank, and promote the fermentation process, and then put the obtained mixed solution into the fermentation Keep the gauze bag in the tank until the gauze bag is completely submerged, seal the fermenter, and ferment at 45°C for 30 days; after the fermentation is complete, take out the gauze bag, spray and freeze the basalt chunks in the gauze bag with liquid nitrogen for 10 minutes, and then freeze The final basalt block was put into a ball mill and ground for 2 hours and passed through a 200-mesh steel sieve to obtain sieved basalt powder; 23g iron nitrate, 15g nickel nitrate, 13g copper nitrate and 5g palladium nitrate were di...

example 3

[0026] Weigh 1.5kg of basalt and put it into a stone crusher for crushing for 25 minutes to obtain coarse basalt and put it into a gauze bag, put the gauze bag at the bottom of the fermentation tank, and mix pig manure and biogas liquid at a mass ratio of 1:5 Obtain the mixed solution, add 10% sodium thiosulfate of pig manure mass to the mixed solution, reduce the dissolved oxygen content in the mixed solution, optimize the anaerobic environment in the fermentation tank, and promote the fermentation process, and then put the obtained mixed solution into Put the gauze bag in the fermentation tank until the gauze bag is completely submerged, seal the fermenter, and ferment at 40°C for 25 days; after the fermentation is over, take out the gauze bag, and immediately spray and freeze the basalt chunks in the gauze bag with liquid nitrogen for 8 minutes. Put the frozen basalt block into a ball mill to grind for 1.5h and pass through a 200-mesh steel sieve to obtain sieved basalt powd...

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a method for preparing self-regeneration long-acting high-activity denitration catalysts. The method includes steps of carrying out micro-corrosion on the surfaces and the inside of porous basalt with honeycomb structures by means of fermenting biogas slurry and pig manure; freezing water infused into the basalt by means of liquid nitrogen freezing, enlarging the volume to carry out expansion and crazing the basalt to obtain basalt powder; attaching organic acid into the basalt powder by means of pretreatment and chelating metal ions in the surfaces and pores of the basalt powder when the basalt powder is in contact with mixed metal impregnation liquid; carrying out calcining to form metal oxide and allowing the metal oxide to be tightly adsorbed on the surface of a carrier; mixing the carrier and adhesive with each other to obtain mixtures and smearing the mixtures on the surfaces of zeolite to obtain the catalysts. The porous basalt with the honeycomb structures is used as a catalyst carrier. The method has the advantages that outer layers of the catalysts can be gradually aged and fall off layer upon layer under high-temperature and abrasion effects in catalysis procedures, accordingly, internal new catalysis layers can be exposed, the catalysts do not need to be replaced, the service lives of the catalysts can be prolonged, and the catalysts are good in denitration activity.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a self-renewing long-acting high-activity denitration catalyst. Background technique [0002] With the continuous development of the economy, the burning of fossil fuels continues to increase, and the emission of polluting gases including nitrogen oxides has increased sharply. There are many kinds of nitrogen oxides, mainly nitrogen monoxide and nitrogen dioxide, which have caused great damage to the environment. In order to reduce the pollution of nitrogen oxides, the development and application of denitrification catalysts have attracted people's attention. [0003] At present, the most widely used denitrification technology is selective catalytic reduction (SCR). The key to the SCR denitrification process is the catalyst. Most of the catalysts used in industry today are TiO 2 As the matrix, the oxides of tungsten and vana...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J29/00B01D53/86B01D53/56
CPCB01J23/8926B01D53/8628B01D2255/1023B01D2255/20738B01D2255/20753B01D2255/20761B01D2255/50B01J29/00B01J37/0203B01J37/0207B01J2229/18
Inventor 蒋春霞林晨李雪晴
Owner 蒋春霞
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