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Preparation method of iron-manganese catalyst

A catalyst, iron-manganese technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., to achieve the effects of easy operation, excellent water and sulfur resistance, and high catalytic NOx activity

Inactive Publication Date: 2020-04-28
HAIMEN YUANMEI MEISHU TUAN SHEJI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, it is found that iron-manganese catalysts are mostly prepared by coprecipitation and citric acid method, but there are few reports on the preparation of iron-manganese catalysts for low-temperature denitrification by hydrothermal method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing an iron-manganese catalyst, comprising the steps of: adding 20 parts of manganese oxide nanoparticles to 75 parts of deionized water, ultrasonically dispersing for 45 minutes, adding 70 parts of ferric nitrate solution with a concentration of 0.1mol / L, and dripping Add ammonia water until the pH is 2.5, transfer the mixed solution into a hydrothermal reaction kettle, put it in an oven at 170°C for hydrothermal reaction for 4.5 hours, separate and wash, dry the obtained solid at 70°C for 24 hours, and finally calcinate it at 385°C for 4.5 hours under an oxygen atmosphere. It can be obtained after cooling; all raw materials are in parts by weight.

Embodiment 2

[0018] A method for preparing an iron-manganese catalyst, comprising the steps of: adding 15 parts of manganese oxide nanoparticles to 70 parts of deionized water, ultrasonically dispersing for 40 minutes, adding 65 parts of ferric nitrate solution with a concentration of 0.1mol / L, and dripping Add ammonia water to pH 2.4, move the mixed solution into a hydrothermal reaction kettle, put it in an oven for 4 hours at 165°C for hydrothermal reaction, separate and wash, dry the obtained solid at 65°C for 23 hours, and finally calcinate it at 380°C for 4 hours in an oxygen atmosphere, and cool it down. Obtained; All raw materials are parts by weight.

Embodiment 3

[0020] A method for preparing an iron-manganese catalyst, comprising the steps of: adding 25 parts of manganese oxide nanoparticles to 80 parts of deionized water, ultrasonically dispersing for 50 minutes, adding 75 parts of ferric nitrate solution with a concentration of 0.1mol / L, and dripping Add ammonia water until the pH is 2.6, transfer the mixed solution into a hydrothermal reaction kettle, put it in an oven for 175°C hydrothermal reaction for 5 hours, separate and wash, dry the obtained solid at 75°C for 25 hours, and finally calcinate it under an oxygen atmosphere at 390°C for 5 hours, and cool it Obtained; All raw materials are parts by weight.

[0021] The method is simple, quick and easy to operate, and the prepared iron-manganese catalyst has higher catalytic NO x activity, and at the same time, the catalyst exhibits better water and sulfur resistance properties, and can be prepared on a large scale.

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PUM

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Abstract

The invention discloses a preparation method of an iron-manganese catalyst. The method comprises the following steps: adding manganese oxide nanoparticles into deionized water, ultrasonic dispersion for 40-50 min, adding a ferric nitrate solution, dropwise adding ammonia water under a magnetic stirring condition until the pH value is 2.4-2.6, transferring the mixed solution into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle into a drying oven for hydrothermal reaction at 165-175 DEG C for 4-5 hours, separating and washing, drying the obtained solid at 65-75 DEG C for23-25 hours, finally calcining the solid at 380-390 DEG C in an oxygen atmosphere for 4-5 hours, and cooling. The method is simple, convenient, rapid and easy to operate, the prepared iron-manganesecatalyst has high NOx catalytic activity, and meanwhile, the catalyst shows excellent water resistance and sulfur resistance and can be prepared on a large scale.

Description

technical field [0001] The invention relates to a preparation method of an iron-manganese catalyst. Background technique [0002] Nitrogen oxides (NO and NO 2 ), mainly comes from automobile exhaust, fossil fuel combustion and industrial waste gas, and is one of the main pollutants of air pollution. They can cause a series of serious environmental problems, such as photochemical smog, acid rain, ozone depletion and greenhouse effect, etc. NH 3 Selective catalytic reduction of NO with NH 3 , NH 3 -SCR) technology, with high selectivity and high efficiency, is the most widely used in stationary source flue gas denitrification. The SCR catalyst is the core of this technology, and it is very important to realize the efficient removal of NOx. V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The system catalyst is a commercial catalyst commonly used in industry at present, and the reaction temperature is generally around 350-400°C. The SCR denitrification device is generally placed before ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892
Inventor 不公告发明人
Owner HAIMEN YUANMEI MEISHU TUAN SHEJI CO LTD
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