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Preparation method and use method of manganite catalyst applied to catalytic decomposition of nitrogen oxides at low temperature

A technology of nitrogen oxides and low-temperature catalysis, which is applied in the field of pollution control, can solve the problem of low catalytic activity, and achieve the effect of low price and low cost

Active Publication Date: 2016-06-22
XIAN XIKUANG ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, the existing NO x There are two main problems in the catalytic decomposition system: ①The catalytic activity of non-precious metal catalysts is very low at low temperature (less than 400°C); ②Oxygen has a strong inhibitory effect on the catalytic decomposition reaction

Method used

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  • Preparation method and use method of manganite catalyst applied to catalytic decomposition of nitrogen oxides at low temperature
  • Preparation method and use method of manganite catalyst applied to catalytic decomposition of nitrogen oxides at low temperature
  • Preparation method and use method of manganite catalyst applied to catalytic decomposition of nitrogen oxides at low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0020] MnO of the present invention x The -450 catalyst is calcined at 450°C, and the Mn(CH 3 COO) 2 4H 2 O and Na 2 CO 3 The molar ratio is 1:2, the specific preparation method:

[0021] 0.015mol of Mn(CH 3 COO) 2 4H 2 O was added to 90 mL of ethylene glycol, stirred and heated to 120 ° C, when the temperature reached 120 ° C, nitrogen gas was injected, and then 0.2 mol / L Na was injected at a flow rate of 4 mL / min. 2 CO 3 150mL solution, and the mixed solution was stirred vigorously, and the heating was stopped after 1 hour of reaction to obtain the mixed solution. When the temperature of the mixed solution dropped below 50°C, the mixed solution was suction-filtered, and washed three times with ethanol and deionized water, and the filtered After the final sediment was dried at 90°C for 8 hours, it was put into a vacuum drying oven for further drying at 50°C for 8 hours, and finally calcined at 450°C for 4 hours. It was tabletted, crushed, and sieved with 40-60 meshes...

Embodiment 2

[0024] The calcination temperature of the catalyst described in Example 1 is changed from 450°C to 500°C, and the specific preparation method is:

[0025] 0.015mol of Mn(CH 3 COO) 2 4H 2 O was added to 90 mL of ethylene glycol, stirred and heated to 120°C. When the temperature reached 120°C, nitrogen gas was introduced, and then 0.2mol / L Na was injected at a flow rate of 4mL / min. 2 CO 3 150mL solution, and the mixed solution was stirred vigorously, and the heating was stopped after 1 hour of reaction to obtain the mixed solution. When the temperature of the mixed solution dropped below 50°C, the mixed solution was suction-filtered, and washed three times with ethanol and deionized water, and the filtered After drying the final sediment at 90°C for 8 hours, put it into a vacuum drying oven for further drying at 50°C for 8 hours, and finally calcined at 500°C for 4 hours, and obtained low-temperature catalytic decomposition Manganese oxide catalyst for nitrogen oxides, denot...

Embodiment 3

[0028] Mn(CH 3 COO) 2 4H 2 O was added to ethylene glycol and stirred and heated to 120°C. When the temperature reached 120°C, nitrogen gas was introduced, and then 0.2mol / L Na was injected at a flow rate of 3mL / min. 2 CO 3 solution, and stir the mixed solution vigorously, and stop heating after 1 hour of reaction to obtain the mixed solution. When the temperature of the mixed solution drops below 50°C, the mixed solution is suction-filtered, and washed with ethanol and deionized water repeatedly for 5 times, and the filtered After the sediment was dried at 120°C for 8 hours, it was put into a vacuum drying oven for further drying at 50°C for 10 hours, and finally calcined at 470°C for 5 hours. After tableting, crushing, and sieving with 40-80 meshes, low-temperature catalytic decomposition of nitrogen was obtained. Oxides of manganese oxide catalysts. Among them, Mn(CH 3 COO) 2 4H 2 The molar ratio of O to ethylene glycol is 1:110, (Mn(CH 3 COO) 2 4H 2 O and Na 2 C...

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Abstract

The invention discloses a preparation method and a use method of a manganite catalyst applied to catalytic decomposition of nitrogen oxides at a low temperature. The preparation method comprises the following steps: mixing and stirring Mn(CH3COO)2.4H2O and ethylene glycol, heating to 120 DEG C, introducing nitrogen at 120 DEG C, adding an alkaline carbonate solution, stirring for reacting for 1 hour, cooling, performing suction filtration, drying, calcining at 450-500 DEG C for 3-5 hours, tabletting, crushing, and sieving, thereby obtaining the manganite catalyst. The manganite catalyst has a regular nano spherical structure, and can be used for efficiently decomposing nitrogen oxides at a low temperature of 250-350 DEG C. The manganite catalyst has good performance of catalytic decomposition, which can be up to 63.9%, on nitrogen oxides at a low temperature.

Description

technical field [0001] The invention relates to the technical field of pollution control, in particular to a method for preparing and using a manganese oxide catalyst for catalytically decomposing nitrogen oxides at low temperature. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants that cause smog, which can lead to major environmental problems such as photochemical smog, acid rain, and ozone layer destruction. Therefore, denitrification technology is a research hotspot in the field of pollution control. NO x Catalytic decomposition can generate harmless N without adding reducing agents such as ammonia 2 and O 2 , so it is considered to be the most ideal method for catalytic denitrification. Chinese patent 200810064832.4 discloses a "catalyst for directly decomposing nitrogen oxides and its preparation method", the catalyst is made of La 2-x Ba x NiO 4 and Ba(NO 3 ) 2 made, but the catalyst light-off temperature is higher (T 50 = ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/08B01D53/94B01D53/86B01D53/56
CPCB01D53/8628B01D53/9413B01J23/34B01D2255/2073B01J35/51
Inventor 潘华建艳飞何炽陈宁娜
Owner XIAN XIKUANG ENVIRONMENTAL PROTECTION
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