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Preparation method of denitration catalyst cooperating with NH3 and CO

A technology of denitration catalyst and pore-forming agent, which is applied in the field of preparation of denitration catalyst, can solve the problems of difficulty in meeting flue gas emission standards, increased denitration cost, poor denitration efficiency, etc., achieve excellent low-temperature catalytic denitration activity, and improve CO selectivity. Oxidizing ability, the effect of reducing the amount of injection

Pending Publication Date: 2021-11-02
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For low-temperature flue gas such as sintering, the flue gas temperature is generally 110-150°C. The current denitrification process mainly uses NH 3 -SCR denitrification technology, and the optimum reaction temperature of the catalyst needs to be around 350°C. In order to solve the current situation of poor denitrification efficiency at low temperatures, it is generally adopted to raise the temperature of the flue gas to 180-200°C, increase the amount of ammonia injection, and increase the V in the catalyst. However, there are many disadvantages in the above method, such as the increase of denitrification cost, the increase of ammonia escape, etc., and it is difficult to meet the requirements of flue gas emission standards

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  • Preparation method of denitration catalyst cooperating with NH3 and CO

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Experimental program
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Effect test

Embodiment 1

[0029] A synergistic NH 3 A method for preparing a denitration catalyst with CO, comprising the steps of:

[0030] 1) Dissolve 10g of manganese nitrate, 13g of cerium nitrate, 35g of cobalt nitrate, 3g of propylene glycol and 2g of field green powder in deionized water, heat to 40-45°C, and stir thoroughly;

[0031] 2) Add 0.125mol / L Na 2 CO 3 Add dropwise to the solution in step 1), keep the pH value of the solution at 7.5-9, and stir continuously for 2.5-3 hours to promote the precipitation of metal salts;

[0032] 3) Filter the precipitate obtained in step 2), and wash with distilled water (40-60°C), repeat 3-5 times to completely remove impurities;

[0033] 4) The solid obtained in step 3) was dried at 50°C for 48 hours, and calcined at 500°C for 3 hours, and the heating rate was set at 2-15°C / min to obtain the desired catalyst.

Embodiment 2

[0035] A synergistic NH 3 A method for preparing a denitration catalyst with CO, comprising the steps of:

[0036] 1) Dissolve 10g manganese acetate, 3g cerium nitrate, 27g cobalt chloride, 1.5g copper nitrate, 2g propylene glycol and 1.5g PVP in deionized water, heat to 40-45°C, and stir thoroughly;

[0037] 2) Add 0.150mol / L Na 2 CO 3 Add dropwise to the solution in step 1), keep the pH value of the solution at 7.5-8.5, and stir continuously for 3-4 hours to promote the precipitation of metal salts;

[0038] 3) Filter the precipitate obtained in step 2), and wash with distilled water (40-45°C), repeat 3-5 times, and completely remove impurities;

[0039] 4) The solid obtained in step 3) was dried at 70°C for 36 hours, and calcined at 450°C for 3.5 hours, and the heating rate was set at 5-10°C / min to obtain the desired catalyst.

Embodiment 3

[0041] A synergistic NH 3 A method for preparing a denitration catalyst with CO, comprising the steps of:

[0042] 1) Dissolve 8g of manganese acetate, 32g of cobalt chloride, 2.5g of copper nitrate, 1.5g of propylene glycol and 2g of PEG in deionized water, heat to 50-60°C, and stir thoroughly;

[0043] 2) Add 0.3mol / L ammonia water dropwise to the solution in step 1), keep the pH value of the solution at 8.0-8.5, and stir continuously for 2-3 hours to promote the precipitation of metal salts;

[0044] 3) Filter the precipitate obtained in step 2), and wash with distilled water (40-45°C), repeat 3-5 times, and completely remove impurities;

[0045] 4) The solid obtained in step 3) was dried at 80°C for 28 hours, and calcined at 500°C for 3 hours, and the heating rate was set at 2-10°C / min to obtain the desired catalyst.

[0046] Under the condition of simulated flue gas, the performance of the denitrification catalyst was evaluated, and the NH 3 As a reducing agent, the re...

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Abstract

The invention relates to the technical field of catalyst material preparation and air pollution control, and particularly discloses a preparation method of a denitration catalyst cooperating with NH3 and CO. According to the preparation method, various soluble metal salts, propylene glycol and a pore-forming agent are taken as raw materials and dissolved in deionized water, sodium carbonate / and ammonia water are taken as precipitants, and the metal proportioning catalyst with a specific proportion is obtained through component contents and operation parameters during impregnation, so that the distribution of active components is promoted, and the performance of the catalyst is improved. An existing denitration device is utilized, NOx is reduced through CO in the flue gas, and the flue gas can be heated through the releasing capacity of the CO after oxidation, so that the flue gas reheating cost is reduced; and meanwhile, the catalyst, serving as the denitration reducing agent, can reduce the spraying amount of NH3 and reduce NH3 escape. The catalyst is very suitable for current national conditions in China and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of catalyst material preparation and air pollution control, in particular to a synergistic NH 3 Preparation method of denitrification catalyst with CO. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of national quality of life requirements, the pressure brought by environmental pollution is increasing. As one of the main pollutants of current air pollution, nitrogen oxides are closely related to the quality of my country's atmospheric environment. For low-temperature flue gas such as sintering, the flue gas temperature is generally 110-150°C. The current denitrification process mainly uses NH 3 -SCR denitrification technology, and the optimal reaction temperature of the catalyst needs to be around 350°C. In order to solve the current situation of poor denitrification efficiency at low temperatures, it is generally adopted to raise the tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/03B01D53/86B01D53/90B01D53/56
CPCB01J23/8892B01J37/03B01J37/0018B01D53/8628B01D53/90B01D2251/204B01D2251/2062
Inventor 张兴宇王鲁元魏伟于贺伟刘倩倩陈正鑫
Owner QILU UNIV OF TECH
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