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Strip-shaped manganese-based catalyst for catalytic oxidation of NO and preparation method of strip-shaped manganese-based catalyst

A strip-shaped manganese-based, catalytic oxidation technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of insufficient crushing strength of catalysts, poor resistance to sulfur and water, and difficulties in industrial application and other problems, to achieve good industrial application prospects, good plasticity, and promote the effect of dispersion

Inactive Publication Date: 2018-08-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manganese-based catalysts have attracted extensive attention due to their rich valence changes and oxidation forms. However, manganese-based catalysts have the problem of poor resistance to sulfur and water, and the crushing strength of the catalyst is not enough to meet the requirements of fixed beds in industrial production. , the industrial application is difficult, and there are few reports about its extruded method

Method used

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  • Strip-shaped manganese-based catalyst for catalytic oxidation of NO and preparation method of strip-shaped manganese-based catalyst

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Experimental program
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Effect test

Embodiment 1

[0030] The bar-shaped manganese-based catalyst of the present embodiment 1 uses manganese nitrate as the precursor of the catalyst, and uses ZSM-5 molecular sieve as the carrier of the catalyst. The mass fraction of manganese in the catalyst precursor is 10%, and the obtained bar-shaped manganese The base catalyst has a cross-sectional diameter of 3 mm.

[0031] The preparation method of the bar-shaped manganese-based catalyst of present embodiment 1 is as follows:

[0032] Step 1, the preparation of catalyst precursor: get 50ml 25 ℃ of distilled waters in the three necked round bottom flask of 250ml, the Mn(NO of 3.26g 3 ) 2 Dissolve in the above aqueous solution, and add 10g of H-β molecular sieve into the above solution, mechanically stir for 3 hours in a water bath at 25°C, evaporate excess water by heating in a water bath at 75°C, and vacuum dry at 100°C for 12 hours, then Calcined in a muffle furnace at 400°C for 5h, with a heating rate of 5°C / min, the obtained Mn-ZSM-...

Embodiment 2

[0036] The bar-shaped manganese-based catalyst of the present embodiment 2 uses manganese acetate as the precursor of the catalyst, uses ZSM-5 molecular sieve as the carrier of the catalyst, and the mass fraction of manganese in the catalyst precursor is 10%, and the obtained bar-shaped manganese The base catalyst has a cross-sectional diameter of 3 mm.

[0037] The preparation method of the bar-shaped manganese-based catalyst of present embodiment 2 is as follows:

[0038] Step 1, preparation of catalyst precursor:

[0039] Take 50ml of distilled water at 25°C in a 250ml three-neck round bottom flask, and put 4.46g of C 4 h 6 MnO 4 4H 2O was dissolved in the above aqueous solution, and 10g of ZSM-5 molecular sieve was added to the above solution, mechanically stirred in a water bath at 25°C for 3h, then heated in a water bath at 75°C to evaporate excess water, and vacuum dried at 100°C for 12h, then Calcined in a muffle furnace at 400°C for 5h, with a heating rate of 5°C...

Embodiment 3

[0044] The bar-shaped manganese-based catalyst of the present embodiment 3 uses manganese nitrate as the precursor of the catalyst, and uses H-β molecular sieve as the carrier of the catalyst. The mass fraction of manganese in the catalyst precursor is 20%, and the obtained bar-shaped manganese The base catalyst has a cross-sectional diameter of 4 mm.

[0045] The preparation method of the present embodiment 3 bar-shaped manganese-based catalysts is as follows:

[0046] Step 1, preparation of catalyst precursor:

[0047] Get 50ml of distilled water at 25°C in a 250ml three-necked round-bottomed flask, add 6.51g of Mn(NO 3 ) 2 Dissolve in the above aqueous solution, add 10g of H-β molecular sieve to the above solution, mechanically stir for 5 hours in a water bath at 25°C, evaporate excess water by heating in a water bath at 75°C, and vacuum dry at 100°C for 12 hours; then Calcined in a muffle furnace at 400°C for 5h, with a heating rate of 5°C / min, the obtained Mn-β catalys...

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Abstract

The invention discloses a strip-shaped manganese-based catalyst for catalytic oxidation of NO and a preparation method of the strip-shaped manganese-based catalyst for the catalytic oxidation of NO. Amanganese oxide is served as a precursor of the catalyst, an H-beta molecular sieve of which Si / Al is equal to 25 or a ZSM-5 molecular sieve of which Si / Al is equal to 36 is served as a carrier of the catalyst, the mass percentage of manganese in the precursor is calculated at 10% to 30% based on the mass of the molecular sieve carrier, and the cross-sectional diameter of the catalyst is 2 mm to4 mm. The preparation process of the catalyst comprises preparation of the catalyst precursor and formation of the strip-shaped manganese-based catalyst; the catalyst precursor is prepared with a wetimpregnation method, and the preparation of the strip-shaped manganese-based catalyst comprises the following four steps: performing kneading, forming, drying and roasting. The strip-shaped manganese-based catalyst disclosed by the invention is easy in kneading during the operation process of the forming, strips are easy to extrude, the plasticity is good, deformation is difficult, and the obtained catalyst has relatively high mechanical strength, further has good catalytic performance and can well meet requirements of industrial application.

Description

technical field [0001] The invention belongs to the technical field of preparation of low-temperature denitration catalysts, and in particular relates to a bar-shaped manganese-based catalyst for catalytic oxidation of NO and a preparation method thereof. Background technique [0002] Nitrogen oxides are one of the most important air pollutants and are an important cause of climate warming and the greenhouse effect. With the increasing discharge of nitrogen oxides, the problem of environmental pollution is becoming more and more serious, and more and more people pay more and more attention to environmental pollution. According to incomplete statistics, my country's NO x Emissions account for about 10% of the world's total emissions, so, in order to protect the environment, NO x The reduction and removal of emissions is urgent. At present, the methods for fixed source low-temperature denitrification mainly include dry flue gas denitrification technology and wet flue gas de...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J29/78B01D53/86B01D53/56
CPCB01J29/48B01D53/8628B01D2255/2073B01D2255/502B01D2255/504B01D2257/404B01J29/7815
Inventor 张光旭许超许文晋
Owner WUHAN UNIV OF TECH
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