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Preparation method and application of catalyst for NOx removal

A nitrogen oxide and catalyst technology, applied in the field of catalysts and their preparation, can solve problems such as easy deactivation, and achieve the effects of good resistance, high purification rate, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2018-01-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most Mn-based metal oxide catalysts are effective for SO 2 Sensitive and easily inactivated at lower temperatures

Method used

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  • Preparation method and application of catalyst for NOx removal
  • Preparation method and application of catalyst for NOx removal
  • Preparation method and application of catalyst for NOx removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, prepare a kind of catalyst that removes nitrogen oxide, the steps are as follows:

[0024] Step 1, take 0.025mol Mn(NO 3 ) 2 ·6H 2 O and 0.005mol Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water and configured into solution A1, so that the molar ratio of Ni to Mn was 0.2:1. Take 0.0025molCe(NO 3 ) 2 ·6H 2 O was dissolved in distilled water so that the molar ratio of Ce to Mn in solution A1 was 0.1:1 to prepare solution B1. Take 0.125mol Na 2 CO 3 Dissolve in 250ml distilled water to make solution C1.

[0025] Step 2. Drop the above-prepared solution C1 into the flask containing solution A1 drop by drop, and stir vigorously at the same time. By adjusting the drop rate of solution C1 to control the pH of the titration end point of the mixed solution = 8, continue to stir for 20 minutes, and keep at room temperature. Aging for 10 hours and filtering to obtain filter cake A1; drip solution C1 dropwise into the flask containing solution B1 while...

Embodiment 2

[0029] Embodiment 2, prepare a kind of catalyst that removes nitrogen oxide, the steps are as follows:

[0030]Step 1, take 0.025mol Mn(NO 3 ) 2 ·6H 2 O and 0.01mol Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water and configured as solution A2, so that the molar ratio of Ni to Mn was 0.4:1. Take 0.005molCe(NO 3 ) 2 ·6H 2 O was dissolved in distilled water so that the molar ratio of Ce to Mn in solution A2 was 0.2:1 to prepare solution B2. Take 0.125mol Na 2 CO 3 Dissolve in 250ml distilled water to make solution C2.

[0031] Step 2. Drop the above-prepared solution C2 into the flask containing solution A2 drop by drop, and stir vigorously at the same time. By adjusting the drop rate of solution C2 to control the pH of the titration end point of the mixed solution = 9, continue to stir for 30 minutes, and keep at room temperature. Aging for 12 hours, filtering to obtain filter cake A2; drop solution C2 into the flask containing solution B2 drop by drop, while st...

Embodiment 3

[0035] Embodiment 3, prepare a kind of catalyst that removes nitrogen oxide, the steps are as follows:

[0036] Step 1, take 0.025mol Mn(NO 3 ) 2 ·6H 2 O and 0.015mol Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water and configured as solution A3, so that the molar ratio of Ni to Mn was 0.6:1. Take 0.0075molCe(NO 3 ) 2 ·6H 2 O was dissolved in distilled water so that the molar ratio of Ce to Mn in solution A3 was 0.3:1 to prepare solution B3. Take 0.125mol Na 2 CO 3 Dissolve in 250ml distilled water to make solution C3.

[0037] Step 2. Drop the above-prepared solution C3 into the flask containing solution A3 drop by drop, and stir vigorously at the same time. By adjusting the drop rate of solution C3 to control the pH of the titration end point of the mixed solution to 10, continue to stir for 50 minutes, and keep at room temperature. Aging for 14 hours and filtering to obtain filter cake A3; drop solution C3 into the flask containing solution B3 drop by drop, ...

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Abstract

The invention discloses a preparation method of a catalyst for NOx removal. The preparation method comprises steps as follows: Mn and Ni inorganic salts are dissolved in water, and a solution A is prepared; a Ce inorganic salt is dissolved in water, and a solution B is prepared; Na2CO3 is taken and dissolved in water, a solution C is prepared, the solution C is dropwise added to a flask containingthe solution A, meanwhile, intense stirring is performed, pH of a titration end point of a mixed solution is controlled by adjusting the dropwise adding rate of the solution C, and the solution B andthe solution C are treated with the same method; stirring is continued after titration, then aging and filtering are performed, a filter cake is washed to be neutral, and two precursors are obtainedthrough drying; the two precursors are placed in a muffle furnace and calcined under different conditions; two obtained solids are mixed and ground into powder, the powder is calcined in the air atmosphere, and the catalyst is obtained. The preparation method is simple and easy, the raw materials are cheap and available, and the obtained catalyst has the advantages of high catalytic activity, highanti-sulfur ability and the like and has high application value and good prospect.

Description

technical field [0001] The invention relates to a method for preparing a catalytic nitrogen oxide (NOx) catalyst, belonging to the technical field of catalysts and their preparation. Background technique [0002] Nitrogen oxides (NOx) refer to compounds composed only of nitrogen and oxygen, where nitrogen oxides (NOx) often refer to NO and NO 2 Pollutants in the atmosphere. NOx and H in the air 2 O and O 2 The reaction will form acid rain, which will destroy vegetation, rot buildings, destroy soil, and pollute groundwater. NO in NOx 2 In the presence of organic matter, through a series of complex chemical reactions, photochemical smog is produced, which has strong oxidizing properties, can reduce crop production, irritate human respiratory tract and eyes, and even cause death in severe cases. Naturally emitted NOx mainly comes from the decomposition of organic matter in soil and ocean, which belongs to the nitrogen cycle process in nature. Most of the NOx emitted by hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 刘庆岭李轩郭铭玉韩金峰宋春风
Owner TIANJIN UNIV
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