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Preparation method for denitrified catalyst with nanometer multi-wall spherical spinel structure

A technology of spinel structure and denitrification catalyst, which is applied in the field of preparation of denitrification catalyst, can solve the problems of less surface pores, low specific surface area of ​​nanoparticles, influence and other problems, and achieve the effects of improving catalytic activity, controlling production cost and reducing toxicity

Active Publication Date: 2014-04-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the synthesis of denitration catalysts is mainly carried out by coprecipitation method. The prepared nanoparticles have disadvantages such as low specific surface area, few surface pores, ineffective use of active sites inside the particles, and uneven distribution of active components, which have a great impact on up

Method used

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  • Preparation method for denitrified catalyst with nanometer multi-wall spherical spinel structure

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Fructose was taken as the carbon precursor, and deionized water was configured to form a 0.2 mol / L sugar / water mixed solution, which was then transferred to a high-pressure reactor, and the o C under the condition of reaction for 5 h, after natural cooling, the product was alternately washed three times with water / ethanol, at 90 o Dry overnight at C and set aside;

[0027] Weigh cobalt acetate and manganese acetate with a molar ratio of 1:0.2 and dissolve them in ethanol / water mixture with a volume ratio of 1:1 to form a precursor with a concentration of (cobalt salt + manganese salt) of 0.2 mol / L solution; at the same time, weigh the prepared carbon template, mix it with the precursor solution at a mass ratio of 1:10, and sonicate for 30 minutes. Then at 20 o The adsorption was carried out under the condition of C, and the adsorption time was 4 h. After the adsorption was completed, the product was alternately washed with water / ethanol at 60 o C after drying at 1 ...

Embodiment 2

[0030] Glucose was taken as the carbon precursor, and deionized water was configured to form a 0.4 mol / L sugar / water mixed solution, which was then transferred to a high-pressure reactor, and the o C under the condition of reaction for 12 h, after natural cooling, the product was alternately washed three times with water / ethanol, at 90 o Dry overnight at C and set aside;

[0031]Weigh ferric chloride and manganese chloride with a molar ratio of 1:0.5, and dissolve them in ethanol / water mixture with a volume ratio of 1:3 to prepare (iron salt + manganese salt) with a concentration of 0.4 mol / L. Precursor solution; at the same time, weigh the prepared carbon template, mix it with the precursor solution at a mass ratio of 1:20, and sonicate for 30 minutes. Then at 50 o The adsorption was carried out under the condition of C, and the adsorption time was 6 h. After the adsorption was completed, the product was alternately washed with water / ethanol at 60 o C after drying at 3 o...

Embodiment 3

[0034] Take sucrose as the carbon precursor, and deionized water to form a 0.5 mol / L sugar / water mixed solution, which is then transferred to a high-pressure reactor, at 190 o C conditions were reacted for 20 h, after natural cooling, the product was washed three times with water / ethanol alternately, at 90 o Dry overnight at C and set aside;

[0035] Weigh cobalt nitrate and cerium nitrate with a molar ratio of 1:0.7, and dissolve them in an ethanol / water mixture with a volume ratio of 1:4 to prepare a precursor with a concentration of (cobalt salt + cerium salt) of 0.5 mol / L solution; at the same time, weigh the prepared carbon template, mix it with the precursor solution at a mass ratio of 1:30, and sonicate for 30 minutes. Then at 60 o The adsorption was carried out under the condition of C, and the adsorption time was 10 h. After the adsorption was completed, the product was alternately washed with water / ethanol at 60 o C after drying at 3 o The heating rate of C / min ...

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Abstract

The invention relates to a preparation method for a denitrified catalyst which has a nanometer multi-wall spherical structure and takes spinel double-metal oxide as an active component, and belongs to the fields of nanomaterial preparation technique and environment protection technology. The preparation method mainly comprises the steps: by taking carbon spheres, synthesized by various carbon precursors through hydrothermal reaction, as templates, firstly, evenly dispersing in an ethanol/water mixed solution in which various metal precursors are dissolved, then aging in a solution so as to realize the full adsorption of metal ions, finally drying, controlling temperature and calcining and the like, thus obtaining the spinel-state denitrified catalyst with high specific surface area and high activity. Proved by tests, the catalyst has wider catalytic temperature windows. Therefore, the catalyst can be used for selective catalytic reduction of nitrogen oxide in smoke emitted from a diesel engine tail gas, a coal-fired power plant, a steel mill and the like.

Description

technical field [0001] The invention relates to a preparation method of a denitrification catalyst, which belongs to the technical fields of nanometer material preparation technology and environmental protection. Background technique [0002] Nitrogen oxides (NO x ) can lead to serious environmental problems such as acid rain, the hole in the ozone layer, global warming, and photochemical smog. As a large coal-burning country, my country produces a large amount of nitrogen oxide waste gas every year. With the rapid development of my country's economy, the emission of nitrogen oxides is also increasing year by year. At the same time, it is increasingly difficult for existing denitrification technologies to meet new emission requirements. Therefore, it is particularly important to carry out research on flue gas denitrification in our country. [0003] At present, selective reduction technology (SCR) is widely used in the removal of nitrogen oxides produced by various mobil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/83B01J23/86B82Y30/00B01D53/86B01D53/56
Inventor 张登松施利毅蔡思翔黄垒张剑平
Owner SHANGHAI UNIV
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