Cerium-zirconium base nitric oxide common temperature catalyst preparation method

The technology of nitric oxide and catalyst is applied in the field of environmental purification of NOx gas pollutant treatment, which can solve the problems of unsuitable NOx purification treatment, complicated process and high reaction temperature, and achieves high catalytic oxidation efficiency, simple process and improved absorption efficiency. Effect

Inactive Publication Date: 2013-08-28
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the research on the catalytic oxidation of nitric oxide, Chinese patent CN101822983A discloses a kind of mesoporous silica as the carrier, one or two mixtures of potassium and molybdenum as the doping component, and platinum as the active component. Catalyst for catalytic oxidation of nitrogen oxides in flue gas prepared by one-step impregnation method, but the process is more complicated, and the reaction temperature is higher at 150-300 °C
Chinese patent CN101352645 discloses a flue gas catalytic oxidation denitrification process, using TiO 2 or ZrO 2 -TiO 2 As the carrier, Co is the catalyst of the active component, but also the reaction temperature is too high, so it is not suitable for NOx purification treatment under normal temperature conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 0.01mol cerium nitrate and zirconium nitrate respectively, fully dissolve them in 5ml deionized water; measure 5ml (about 3.25g), 20-40 mesh activated alumina powder, and immerse the alumina powder in the above solution at room temperature for 1h Finally, dry at 120°C for 3h; then bake in a muffle furnace at 500°C for 4h;

[0017] Weigh 0.01mol of copper acetate and dissolve it in 5ml of deionized water. After it is fully dissolved, add ammonia solution dropwise and stir vigorously until the pH of the solution is 7.0;

[0018] The nitric oxide catalyst can be obtained by immersing the calcined alumina powder in the above solution at room temperature for 1 hour, and then drying it at 150° C. for 10 to 12 hours.

[0019] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the catalytic oxidation efficiency of NO was determined to be 70%, and the catalytic effect was basically stable within 5 hours.

Embodiment 2

[0021] Weigh 0.01mol cerium nitrate and zirconium nitrate respectively, fully dissolve them in 5ml deionized water; measure 5ml (about 3.25g), 20-40 mesh activated alumina powder, and immerse the alumina powder in the above solution at room temperature for 1h Finally, dry at 120°C for 3h; then bake in a muffle furnace at 500°C for 5h;

[0022] Weigh 0.015mol of copper acetate, dissolve it in 5ml of deionized water, after it is fully dissolved, add ammonia solution dropwise and stir vigorously until the pH of the solution is 7.0;

[0023] The nitric oxide catalyst can be obtained by immersing the calcined alumina powder in the above solution at room temperature for 1 hour, and then drying it at 150° C. for 12 hours.

[0024] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the catalytic oxidation efficiency of NO was determined to be 76%, and the catalytic effect was basically stable within 5 hours.

Embodiment 3

[0026] Weigh 0.005mol cerium nitrate and zirconium nitrate respectively, fully dissolve them in 5ml deionized water; measure 5ml (about 3.25g), 20-40 mesh activated alumina powder, and immerse the alumina powder in the above solution at room temperature for 1h Finally, dry at 120°C for 3h; then bake in a muffle furnace at 500°C for 4h;

[0027] Weigh 0.015mol of copper acetate, dissolve it in 5ml of deionized water, after it is fully dissolved, add ammonia solution dropwise and stir vigorously until the pH of the solution is 7.0;

[0028] The nitric oxide catalyst can be obtained by immersing the calcined alumina powder in the above solution at room temperature for 1 hour, and then drying it at 150° C. for 12 hours.

[0029] The catalytic performance of the prepared catalyst was evaluated according to the aforementioned test conditions, and the catalytic oxidation efficiency of NO was determined to be 65%, and the catalytic effect was basically stable within 5 hours.

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Abstract

The invention provides a cerium-zirconium base nitric oxide common temperature catalyst preparation method, which is characterized by comprising: adopting active alumina powder as a carrier, carrying out cerium nitrate and zirconium nitrate impregnating loading, calcining, carrying out copper acetate and ammonia water mixed solution impregnating, and carrying out low temperature drying to obtain the catalyst so as to achieve common temperature catalysis oxidation on nitric oxide. Compared with the preparation method in the prior art, the preparation method of the present invention has characteristics of simple process, high catalysis efficiency and the like, wherein NO oxidation absorption efficiency is significantly increased.

Description

technical field [0001] The invention relates to a preparation method of a normal-temperature catalyst, in particular to a preparation method of a cerium-zirconium-based nitrogen monoxide catalyst at a normal temperature, which is applied to the field of environmental purification of NOx gas pollutant treatment. Background technique [0002] Among various air pollutants, NO X pollution and the harm it causes cannot be ignored. Most of NOx comes from fuel combustion, that is, vehicle exhaust, industrial kiln emissions, etc. NOx purification treatment can be divided into dry method and wet method according to the process. Dry methods include non-catalytic reduction methods, catalytic reduction methods, adsorption methods, etc.; wet methods include acid absorption, alkali absorption, oxidation absorption, etc. [0003] Oxidation and absorption of NOx under oxygen-enriched conditions is one of the current research directions. Because 90% to 95% of the combustion flue gas is N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83
Inventor 张豪杰王发根刘爽何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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