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Method for preparing multi-component composite oxide catalyst for denitration by metal plate

A denitration catalyst and multi-component composite technology, which is applied in the field of catalyst preparation, can solve the problems of non-regeneration of deactivated catalyst waste residue, high investment cost and operating cost, uneven distribution of active components, etc. The effect of good sintering resistance

Active Publication Date: 2013-07-17
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the denitration catalyst prepared by this process has the disadvantages of thin active component layer, poor denitrification effect in the later stage, easy sintering of the catalyst and uneven distribution of active components.
Moreover, the investment cost and operating cost are high, and the deactivated catalyst waste residue cannot be regenerated, and most of them cannot be reused

Method used

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  • Method for preparing multi-component composite oxide catalyst for denitration by metal plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First remove the surface oxide of the stainless steel plate in 0.1 M HCl, then degrease in 0.15 M NaOH, ultrasonically treat in isopropanol for 10 min, vacuum dry, and set aside;

[0026] Take 0.1 mol / L Ni(NO 3 ) 2 , 0.5 mol / L NH 4 Cl and 0.001 mol / L sodium citrate 200 ml, adjust the pH value to 6.5 with 10% ammonia solution. Put the treated stainless steel plate vertically into the mixed salt solution, and transfer it to a polytetrafluoro-lined autoclave, 150 o C water heat for 12 h. The stainless steel plate on which the double metal hydroxide film was grown in situ was washed with deionized water and dried. Put the obtained stainless steel plate into the muffle furnace and program the temperature 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 oxides obtained after calcination still maintain orderly arrangement.

[0027] The method for testing the SCR activity of the prepared cata...

Embodiment 2

[0029] First remove the surface oxide of the copper plate in 0.1 M HCl, then degrease in 0.15 M NaOH, ultrasonically treat in isopropanol for 10 min, vacuum dry, and set aside;

[0030] Take 0.2 mol / L Ce(NO 3 ) 2 , 2 mol / L NH 4 Cl and 0.05 mol / L sodium citrate 300 ml, adjust the pH value to 7 with 10% ammonia solution. Put the treated copper plate vertically into the mixed salt solution, and transfer it to a polytetrafluoro-lined autoclave, 180 oC water heat for 24 h. The copper plate on which the double metal hydroxide film was grown in situ was washed with deionized water and dried. Put the obtained copper plate into the muffle furnace and program the temperature from room temperature to 500 o C, calcined for 5 h to obtain the final product

[0031] Activity test method is the same as embodiment 1, at reaction temperature 250 o C.C NO =C NH3 =550 ppm, C O2 =3%, space velocity=30000 h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst...

Embodiment 3

[0033] According to the preparation method of the present invention in Example 1, the stainless steel plate of the (uncalcined) double metal hydroxide film obtained by in-situ growth was immersed in an ammonium metavanadate solution with an ion concentration of 0.2 M for 10 s and taken out for 100 o C drying, dipping into the ammonium metavanadate solution again, repeating five times. Put the stainless steel plate with ammonium metavanadate into the muffle furnace and program the temperature from room temperature to 500 o C, calcined for 6 h to obtain the final product.

[0034] Activity test method is the same as embodiment 1, at reaction temperature 300 o C.C NO =C NH3 =550 ppm, C O2 =3%, space velocity=30000 h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst can be kept above 85% for a long time.

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Abstract

The invention discloses a method for preparing a multi-component composite oxide catalyst for denitration by a metal plate. The multi-component composite oxide catalyst for denitration is characterized in that a double-metal oxide which carries out in-situ growth on a metal plate, is arranged regularly on the metal plate and has catalytic activity is utilized as a carrier; or other active metal oxides are loaded on the surface of the metal plate. The method for preparing the multi-component composite oxide catalyst for denitration by a metal plate utilizes a metal plate as a support structureand a reactant, and comprises the following steps that the metal plate and ions in a solution undergo a reaction in hydrothermal conditions to produce a double-metal hydroxide film on the metal plate; the metal plate with the double-metal hydroxide film is subjected to washing, drying and baking, or immersion addition of active components of V, Mn and W on the surface of the double-metal hydroxide film; and through high-temperature calcination, the multi-component composite oxide catalyst for denitration is obtained, wherein the multi-component composite oxide catalyst for denitration has high activity. The method for preparing the multi-component composite oxide catalyst for denitration by a metal plate has the advantages of simple processes, low cost, no need of molding, and recyclable characteristic.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and relates to a method for preparing a multi-element composite oxide denitration catalyst based on a metal plate without forming. Background technique [0002] my country is a large coal country, and its coal production ranks first in the world. Coal can be used in a series of industries related to people's livelihood such as power generation and production. It can be seen that coal occupies a major position in my country's energy structure, but the exhaust gas pollution caused by coal combustion is also a major problem. The main component of coal-burning waste gas is nitrogen oxides, which is one of the main sources of air pollution. It will not only cause acid rain, greenhouse effect and other problems that destroy the earth's ecological environment, but also cause human diseases such as bronchitis and emphysema, and Danger to crops and buildings. Therefore, it is of great significance to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/83B01J23/847B01J23/32B01J35/02B01D53/56B01D53/86
Inventor 张登松施利毅李红蕊
Owner SHANGHAI UNIV
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