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Preparation method of copper-doped cerium sulfide-based nano-crystal 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: 2017-09-22
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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  • Preparation method of copper-doped cerium sulfide-based nano-crystal denitration catalyst
  • Preparation method of copper-doped cerium sulfide-based nano-crystal denitration catalyst
  • Preparation method of copper-doped cerium sulfide-based nano-crystal 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 a 2.00gPS ball and ultrasonicate it 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 was stirred to dissolve completely.

[0025] (3) 6.00g urotropine (C 6 H 12 N 4 ) was stirred and dissolved in 50 ml of deionized water.

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

[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 constant temperature for 0.5 hours at 75°C to make the solvent evenly dispersed in the solution, add urotropine solution (precipitating agent) and stir at constant temperature for 3.0 hours at 75°C.

[0029] (7) The r...

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 a 2.00gPS ball and ultrasonicate it 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 was stirred to dissolve completely.

[0033] (3) 6.00g urotropine (C 6 H 12 N 4 ) was stirred and dissolved in 50 ml of deionized water.

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

[0035] (5) After stirring at a constant temperature of 75° C. for 0.5 hours, a mixed solution of cerium nitrate and copper sulfate was added.

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

[0037] (7) The rea...

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 a 2.00gPS ball and ultrasonicate it 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 was stirred to dissolve completely.

[0041] (3) 6.00g urotropine (C 6 H 12 N 4 ) was stirred and dissolved in 50 ml of deionized water.

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

[0043] (5) After stirring at a constant temperature of 75° C. for 0.5 hours, a mixed solution of cerium nitrate and copper sulfate was added.

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

[0045] (7) The re...

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Abstract

The invention discloses a preparation method of a copper-doped cerium sulfide-based nano-crystal denitration catalyst. The method comprises the following steps: firstly, under a water bath condition, adding a polystyrene sphere ultrasonic dispersion solution into water at 70 DEG C to 80 DEG C and stirring and adding a mixed solution of cerium nitrate and copper sulfate according to the mol ratio of Cu to Ce of (3 to 15) : 10; after uniformly mixing, adding a urotropine solution and stirring and reacting completely; after reacting, cooling, washing with water and washing with ethanol; drying and grinding a product into powder; calcining the powder at 500 DEG C to 600 DEG C at a temperature rising speed of 3 DEG C / min to 5 DEG C / min, so as to obtain the copper-doped cerium sulfide-based nano-crystal denitration catalyst. According to the preparation method, the Cu is doped and sulfate is introduced so that the NH3-SCR (Selective Catalytic Reduction) activity and water-resisting and sulfur-resisting property of the catalyst are improved; the prepared Cu-Ce(S) denitration catalyst not only has an excellent denitration capability, but also has an excellent water-resisting and sulfur-resisting capability; influences caused by water vapor and SO2 are very small and the activity can reach 95 percent or more under a water-sulfur condition.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and relates to a preparation method of a copper-doped cerium sulfide-based nanocrystalline denitration catalyst. Background technique [0002] Selective catalytic reduction (SCR) technology refers to injecting a reducing agent into the flue gas in the presence of a catalyst to selectively interact with NO. x The reaction generates non-toxic and non-polluting N 2 and H 2 O. CeO 2 Because of its low price and relatively non-toxic, it is widely used in SCR technology. CeO 2 The most important property is as an oxygen storage source, which can store and release oxygen by changing the oxidation states of Ce(IV) and Ce(III) under oxidative and reducing conditions. 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 redox cycle process, realize NH 3 Rapid activation and reduction of NO x process and exhib...

Claims

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Application Information

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Patent Type & Authority Applications(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