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Preparation method of SCR denitration catalyst

A denitration catalyst and equipment technology, applied in the field of catalysis, can solve the problems of limiting the industrial application of molecular sieve catalysts, catalyst poisoning, high reaction temperature, and achieve the effects of strong sulfur dioxide resistance, simple operation and simple preparation process.

Inactive Publication Date: 2015-04-29
SHANGHAI MASTECK ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molecular sieve catalysts are characterized by high reaction temperature, up to 600°C, NO x High conversion rate, NH 3 Less leakage, but high reaction temperature limits the industrial application of molecular sieve catalysts
Most of these catalysts are used at high temperature and have poor sulfur resistance. The presence of sulfide can easily cause catalyst poisoning and make it invalid
However, in the low-dust arrangement, the flue gas temperature drops a lot, between 150 and 200°C, which poses a challenge to the low-temperature activity of the catalyst

Method used

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  • Preparation method of SCR denitration catalyst
  • Preparation method of SCR denitration catalyst
  • Preparation method of SCR denitration catalyst

Examples

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Effect test

Embodiment 1

[0033] This embodiment prepares a kind of SCR denitration catalyst, and preparation method comprises the following steps:

[0034] (1) Prepare the mixed solution: Weigh 20g of ferric sulfate solid and 2.4g of ferrous sulfate solid into a 250mL beaker, add 150mL of deionized water, stir and mix well, then use ultrasonic equipment to sonicate for 30min; let it stand for a while Finally, slowly add ammoniacal liquor (volume ratio is 1:1) in solution then, stir simultaneously until solution pH value is 8.0;

[0035] (2) Suction filtration: After the above (1) solution was left to stand for a period of time, a large amount of sediment appeared, and the solution containing the sediment was filtered with a suction filtration device, and the sediment was repeatedly washed with deionized water. Wash to get a relatively pure precipitate;

[0036] (3) Extrusion molding and drying: Put the sediment obtained in the above (2) into a mold for extrusion molding, then put the molded sediment ...

Embodiment 2

[0040] This embodiment provides an SCR denitration catalyst and a preparation method thereof, the preparation method comprising the following steps:

[0041] (1) Prepare the mixed solution: Weigh 40g of ferric sulfate solid and 4.2g of ferrous sulfate solid into a 250mL beaker, add 150mL of deionized water, stir and mix evenly, then use ultrasonic equipment to sonicate for 30min; let it stand for a while Finally, slowly add ammoniacal liquor (volume ratio is 1:1) in solution then, stir simultaneously until the pH value of solution is 8.0;

[0042] (2) Suction filtration: After the above (1) solution was left to stand for a period of time, a large amount of sediment appeared, and the solution containing the sediment was filtered with a suction filtration device, and the sediment was repeatedly washed with deionized water. Wash to get a relatively pure precipitate;

[0043] (3) Extrusion molding and drying: Put the sediment obtained in the above (2) into a mold for extrusion mo...

Embodiment 3

[0047] This embodiment provides an SCR denitration catalyst and a preparation method thereof, the preparation method comprising the following steps:

[0048] (1) Prepare the mixed solution: Weigh 50g of ferric sulfate solid and 4.2g of ferrous sulfate solid into a 250mL beaker, add 150mL of deionized water, stir and mix evenly, and use an ultrasonic device to sonicate for 30min. After standing for a period of time, then slowly add ammonia water (1:1 by volume) to the solution, while stirring until the pH value of the solution is 8.0;

[0049] (2) Suction filtration: After the above (1) solution was left to stand for a period of time, a large amount of sediment appeared, and the solution containing the sediment was filtered with a suction filtration device, and the sediment was repeatedly washed with deionized water. Wash to get a relatively pure precipitate;

[0050] (3) Extrusion molding and drying: Put the sediment obtained in the above (2) into a mold for extrusion molding...

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Abstract

The invention discloses a preparation method of an SCR denitration catalyst. The preparation method of the SCR denitration catalyst comprises the following steps: firstly, preparing a mixed solution; secondly, pumping and filtering; thirdly, carrying out extrusion moulding and drying; fourthly, calcining; and fifthly, grinding and sieving, wherein the main ingredient of the SCR denitration catalyst is iron trioxide, the particle size is 35-65 meshes, the specific surface area is large and is up to 93.76m<2> / g, and the aperture is 12nm. Aiming at overcoming the defects in the prior art, the invention provides the SCR denitration catalyst which has high low temperature catalytic activity and strong anti-sulphide-poisioning property and can be used for effectively removing nitrogen oxide in flue gas; meanwhile, the SCR denitration catalyst is simple in preparation process, the cost is low, and the yield can be 99%, so that the SCR denitration catalyst is applicable to industrial mass production and has a great application prospect in the field of denitration of industrial flue gas.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a preparation method of an SCR denitration catalyst, in particular to an SCR denitration catalyst with high low-temperature catalytic activity and strong resistance to sulfide poisoning and a preparation method thereof. Background technique [0002] With the development of the national economy, population growth and the acceleration of urbanization, the ensuing environmental pollution problems have become increasingly prominent, especially SO 2 and NO x emissions problem. Atmospheric NO x It can cause acid rain, photochemical smog, surface water eutrophication and other problems that damage the ecological environment and endanger human health. "Twelfth Five-Year" environmental protection plan proposed, NO x To focus on controlling pollutants, by 2015 the national NO x The total emission is less than 20.462 million tons, which is 10% lower than that in 2010. NO x It has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01D53/86B01D53/56
Inventor 何冰黄健翔
Owner SHANGHAI MASTECK ENVIRONMENTAL