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Preparation method of reticular multi-component composite oxide monolithic denitration catalyst

A denitration catalyst and multi-component composite technology are applied in the field of preparation of a network-shaped multi-component composite oxide monolithic denitration catalyst, which can solve the problems that the catalyst cannot be regenerated or the regeneration is difficult, the active components are unevenly distributed, and the preparation steps are many. Conducive to denitration catalytic reduction, long service life and simple operation

Active Publication Date: 2012-07-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the existing denitrification catalysts, such as uneven distribution of active components, many preparation steps, high energy consumption, easy fall off, inability or difficulty in regeneration of the catalyst after deactivation, and provide a monolithic denitrification catalyst that does not require molding and a preparation method thereof, the denitrification catalyst is directly grown on a wire mesh in-situ by a hydrothermal method to obtain a multi-element composite metal hydroxide, and is calcined at a high temperature to obtain a multi-element composite metal oxide

Method used

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  • Preparation method of reticular multi-component composite oxide monolithic denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0021] First remove the surface oxide of the barbed wire in dilute hydrochloric acid, ultrasonically treat it in isopropanol for 10 minutes, roll the barbed wire into a roll, dry it in vacuum, and set aside;

[0022] Put the barbed wire roll into 0.27 mol / L Ni(NO 3 ) 2 , 0.27 mol / L Mn(NO 3 ) 2 , 1.0 mol / L NH 4 In the mixed solution of Cl and 0.0015 mol / L sodium citrate, adjust the pH value to 6.5 with 10% ammonia solution. All transferred to the autoclave lined with polytetrafluoroethylene, 150 o C water heat for 12 h. The barbed wire rolls prepared by in-situ growth of multi-component composite metal hydroxide films were washed with deionized water and dried. The resulting rolls of wire mesh were placed in a muffle furnace and the temperature was programmed from room temperature to 500 o C, calcined for 5 h to obtain the final product. From figure 1 It can be seen that the composite oxide on the surface of the barbed wire obtained after calcination is a flower-like s...

Embodiment 2

[0025] First remove the surface oxide of the aluminum screen in dilute hydrochloric acid, ultrasonically treat it in isopropanol for 10 minutes, roll the aluminum screen into a roll, dry it in vacuum, and set aside;

[0026] Put the aluminum mesh roll into 1.0 mol / L Ni(NO 3 ) 2 , 2.0 mol / L Mn(NO 3 ) 2 , 6 mol / L NH 4 In the mixed solution of Cl and 0.5 mol / L sodium citrate, the pH value was adjusted to 7 with 10% ammonia solution. All transferred to a polytetrafluoro-lined autoclave, 200 o C water heat for 24 h. The aluminum wire mesh rolls prepared by in-situ growth of multi-component composite metal hydroxide films were washed with deionized water and dried. Put the obtained aluminum wire mesh roll into a muffle furnace and program the temperature from room temperature to 600 o C, calcined for 6 h to obtain the final product.

[0027] Test condition is the same as embodiment 1, at reaction temperature 270-350 o C, the measured NO conversion rate is over 80%.

Embodiment 3

[0029] First remove the surface oxide of the barbed wire in dilute hydrochloric acid, ultrasonically treat it in isopropanol for 10 minutes, roll the barbed wire into a roll, dry it in vacuum, and set aside;

[0030] Put the barbed wire roll into 3 mol / L Ni(NO 3 ) 2 , 8 mol / L Mn(NO 3 ) 2 , 10 mol / L NH 4In the mixed solution of Cl and 1 mol / L sodium citrate, the pH value was adjusted to 5.5 with 10% ammonia solution. All transferred to the autoclave lined with polytetrafluoroethylene, 150 o C water heat 8 h. The barbed wire rolls prepared by in-situ growth of multi-component composite metal hydroxide films were washed with deionized water and dried. The resulting rolls of wire mesh were placed in a muffle furnace and the temperature was programmed from room temperature to 500 o C, calcined for 12 h to obtain the final product.

[0031] Test condition is the same as embodiment 1, at reaction temperature 200-330 o C, the measured NO conversion rate is above 85%.

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Abstract

The invention discloses a preparation method of a reticular multi-component composite oxide monolithic denitration catalyst. The denitration catalyst is a flower-shaped structure multi-component composite metal oxide which grows on a wire mesh in situ and has catalytic activity. The denitration catalyst is prepared by the steps of: based on a reticular metal wire as a support structure and reactant, and reacting with metal ions in the solution under the hydrothermal condition to generate multi-component metal hydroxide flower-shaped composite structure on the surface of the wire mesh in situ;and then washing, drying, baking and carrying out high-temperature calcination to obtain the denitration catalyst with high activity. The reticular multi-component composite oxide monolithic denitration catalyst has the advantages of being even in active component distribution, rapid in thermal response speed, good in denitration performance, simple in preparation technology, low in cost, free from molding and the like, thus being applicable to treatment for nitric oxides in various tail gases.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and relates to a method for preparing a network multi-component composite oxide monolithic denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) include NO, N 2 O, NO 2 , N 2 o 4 It is one of the main air pollutants, and it is also the cause of acid rain, high ground ozone concentration and photochemical smog. NOx pollution has become a global environmental problem. my country's nitrogen oxide emissions in 2010 were 22.736 million tons, of which NOx emissions from motor vehicles accounted for about 1 / 3 of the country's total nitrogen oxide emissions, and the rest were firepower. Emissions from stationary sources such as power plants. With the continuous development of my country's economy, NOx emissions are also increasing. Many countries in the world have issued strict regulations to limit NOx emissions, and domestic enterprises are also charging NOx pollution fees. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/56B01D53/86
Inventor 张登松施利毅李红蕊高瑞华曹卫国
Owner SHANGHAI UNIV
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