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A kind of preparation method of copper-doped cerium sulfide-based nanocrystalline denitration catalyst

A denitrification catalyst, cerium sulfide-based technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of damaging the fine structure of the catalyst, the influence of catalyst poisoning, and aggravating catalyst poisoning, etc., to achieve high Application prospect and practical value, the effect of improving NOx selective catalytic reduction ability, excellent water resistance and sulfur resistance performance

Active Publication Date: 2020-04-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water and sulfur dioxide in the flue gas will have a poisonous effect on the catalyst
Water appears in the form of water vapor in the flue gas, and the water vapor condensed on the surface of the catalyst will not only intensify the poisoning of the catalyst by soluble alkali metal salts such as K and Na, but also vaporize and expand when the temperature increases, damaging the fine particles of the catalyst. structure, resulting in the rupture of the catalyst

Method used

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  • A kind of preparation method of copper-doped cerium sulfide-based nanocrystalline denitration catalyst
  • A kind of preparation method of copper-doped cerium sulfide-based nanocrystalline denitration catalyst
  • A kind of preparation method of copper-doped cerium sulfide-based nanocrystalline denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of Cu-Ce(S) catalyst with a molar ratio of Cu and Ce of 3:100

[0023] (1) Take 2.00g PS ball and ultrasonic for 30min to disperse it in an appropriate amount of deionized water.

[0024] (2) Cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) 4.00g and copper sulfate (CuSO 4 ) 0.05g is stirred to completely dissolve.

[0025] (3)6.00g urotropine (C 6 H 12 N 4 ) Stir and dissolve in 50ml deionized water.

[0026] (4) Heat 400ml of deionized water with a constant temperature water bath to 75°C, and add the PS ball solution.

[0027] (5) Continue to stir at a constant temperature of 75°C for 0.5 hours and then add a mixed solution of cerium nitrate and copper sulfate.

[0028] (6) Continue to stir at 75°C for 0.5 hours to make the solvent uniformly dispersed in the solution, add urotropine solution (precipitant) and stir at 75°C for 3.0 hours at constant temperature.

[0029] (7) The reacted solution is allowed to stand and cool to room temperature, and it is centr...

Embodiment 2

[0030] Example 2 Preparation of Cu-Ce(S) catalyst with a molar ratio of Cu and Ce of 5:100

[0031] (1) Take 2.00g PS ball and ultrasonic for 30min to disperse it in an appropriate amount of deionized water.

[0032] (2) Cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) 4.00g and copper sulfate (CuSO 4 ) 0.08g is stirred to completely dissolve.

[0033] (3)6.00g urotropine (C 6 H 12 N 4 ) Stir and dissolve in 50ml deionized water.

[0034] (4) Heat 400ml of deionized water with a constant temperature water bath to 75°C, and add the PS ball solution.

[0035] (5) Stir at a constant temperature of 75°C for 0.5 hours and then add a mixed solution of cerium nitrate and copper sulfate.

[0036] (6) Continue to stir at 75°C for 0.5 hours to make the solvent uniformly dispersed in the solution, add urotropine solution (precipitant) and stir at 75°C for 3.0 hours at constant temperature.

[0037] (7) Allow the reacted solution to stand and cool to room temperature, and perform centrifugal washing ...

Embodiment 3

[0038] Example 3 Preparation of Cu-Ce(S) catalyst with a molar ratio of Cu and Ce of 10:100

[0039] (1) Take 2.00g PS ball and ultrasonic for 30min to disperse it in an appropriate amount of deionized water.

[0040] (2) Cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) 4.00g and copper sulfate (CuSO 4 ) 0.16g is stirred to completely dissolve.

[0041] (3)6.00g urotropine (C 6 H 12 N 4 ) Stir and dissolve in 50ml deionized water.

[0042] (4) Heat 400ml deionized water with a constant temperature water bath to 75°C, and add PS ball solution;

[0043] (5) Stir at a constant temperature of 75°C for 0.5 hours and then add a mixed solution of cerium nitrate and copper sulfate.

[0044] (6) Continue to stir at 75°C for 0.5 hours to make the solvent uniformly dispersed in the solution, add urotropine solution (precipitant) and stir at 75°C for 3.0 hours at constant temperature.

[0045] (7) Allow the reacted solution to stand and cool to room temperature, and perform centrifugal washing 3 time...

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Abstract

The invention discloses a preparation method of a copper-doped cerium sulfide-based nanocrystal denitration catalyst. The method is to first add the ultrasonic dispersion of polystyrene balls to water at 70 to 80°C under water bath conditions, and stir to add a mixture of cerium nitrate and copper sulfate at a molar ratio of Cu to Ce of 3 to 15:100. solution, mix evenly and add urotropine solution, stir and react completely, cool after the reaction, wash with water, wash with ethanol, dry, grind into powder, put the powder at 500~ 500~ Calculate at 600°C to obtain a copper-doped cerium sulfide-based nanocrystal denitration catalyst. In the present invention, the doping of Cu and the introduction of sulfate improve the catalyst NH 3 ‑SCR reactivity and water and sulfur resistance. The Cu‑Ce(S) denitrification catalyst prepared not only has excellent denitrification ability, but also has excellent water and sulfur resistance. It is affected by water vapor and SO 2 The effect is very small, and the activity can reach more than 95% under water and sulfur conditions.

Description

Technical field [0001] The invention belongs to the field of catalyst preparation and relates to a method for preparing a copper-doped cerium sulfide-based nanocrystalline denitration catalyst. Background technique [0002] Selective catalytic reduction (SCR) technology refers to spraying a reducing agent into the flue gas in the presence of a catalyst to make it selectively interact with NO x The reaction produces non-toxic and non-polluting N 2 And H 2 O. CeO 2 Because of its low price and relatively non-toxicity, it is widely used in SCR technology. CeO 2 The most important property is as an oxygen storage source. Under oxidation and reduction conditions, the purpose of storing and releasing oxygen is achieved by changing the oxidation states of Ce(IV) and Ce(Ⅲ). Ce(Ⅳ) / Ce(Ⅲ) on the surface of cerium-based compounds has redox activity and can promote NH 3 With NO x Carry out SCR reaction, complete the redox cycle process, and realize NH 3 Rapid activation and reduction of NO x...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J27/04B01J37/031B01J37/082B01D2258/0283B01J35/393B01J35/23
Inventor 曲虹霞叶盛
Owner NANJING UNIV OF SCI & TECH