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Preparation methods of modified titanium dioxide and ultrafine-grain ceramic powder denitration catalyst

A titanium dioxide and modification technology, applied in ceramic products, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc., can solve the problems of large particle size and poor dispersibility, and achieve the effect of high catalyst efficiency

Inactive Publication Date: 2016-12-07
无锡市华东电力设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the large particle size and poor dispersion of existing titanium dioxide, which lead to the activity of the denitration catalyst prepared with titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of ceramic powder is to use electronic metering equipment to modify titanium dioxide, vanadium pentoxide, tungsten trioxide, glass fiber, molybdenum trioxide, and cerium dioxide to prepare mixed powder, and mix them fully and uniformly. Among them, the modified titanium dioxide , vanadium pentoxide, tungsten trioxide, glass fiber, molybdenum trioxide, and cerium oxide in a mass percentage of 70 to 80:0.5 to 1:5 to 10:5 to 10:1 to 6:1 to 6, and then added Portland cement, the mass ratio of Portland cement to the mixed powder is 1:90-95, and the ceramic powder is obtained after thorough mixing and uniform mixing, and the particle size of the ceramic powder is nanometer.

[0026] Tested according to the flue gas composition of a simulated thermal power plant, the flue gas composition is 1000ppm of nitrogen monoxide, 800ppm of ammonia

[0027] 1200ppm, nitrogen 5 ~ 7%, the denitrification catalyst sample prepared by the above method was tested to simu...

Embodiment 1

[0031] Step 1: Preparation of titanium dioxide:

[0032] Titanium dioxide is added to water to prepare a suspension with a concentration of 1% by weight;

[0033] Add sodium hexametaphosphate in suspension as dispersant, ultrasonic vibration 10min, obtain mixed slurry, wherein the addition of sodium hexametaphosphate is 0.1% of titanium dioxide weight; Then mixed slurry is heated to 60 ° C, adopts silicon Sodium silicate is used as the precursor of nano-scale silicon dioxide, and sodium silicate solution is added dropwise in the mixed slurry to modify titanium dioxide, wherein the amount of sodium silicate added is 0.1% of the weight of titanium dioxide, and then mixed slurry Add dilute sulfuric acid dropwise in the mixture, adjust the pH value of the mixed slurry to be 8, and age the mixed slurry for 2h; after the aged mixed slurry is calcined at a temperature of 100 ° C, it is washed, dried and ground to obtain Titanium dioxide coated with silica.

[0034] Step 2: Preparat...

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PUM

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Abstract

Modified titanium dioxide, an ultrafine-grain ceramic powder denitration catalyst, and preparation methods thereof. The invention belongs to the technical field of flue gas denitration catalysts and solves the problems of short service life and narrow available temperature range of a denitration catalytic material in the prior art. The invention firstly provides the preparation method of the modified titanium dioxide, including the steps of: impregnating TiO2 in a sodium silicate solution and calcining the TiO2 at 100-120 DEG C, and washing, drying and grinding the calcined TiO2 to obtain the finished product; and also provides the preparation method of the ultrafine-grain ceramic powder, including the steps of: mixing the modified titanium dioxide with V2O5, WO3, glass fibers, MoO3 and CeO2, adding the mixture to Portland cement, and kneading the mixture to obtain the catalyst. The catalyst is high in catalytic efficiency and has a wide available temperature range.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification catalysts, in particular to a catalyst for flue gas denitrification in thermal power plants using anatase titanium dioxide as a main raw material and a preparation method thereof. Background technique [0002] Nitrogen oxides are the main pollution source of the atmosphere. It not only causes acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endangers human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the field of environmental protection. Ammonia Selective Catalytic Reduction has become the mainstream denitrification technology for stationary sources such as thermal power plants due to its maturity and high efficiency, and its core problem lies in the development of catalysts. [0003] At present, scholars at home and abroad are studying many catalyst sys...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06B01J23/888B01D53/86B01D53/56C04B38/00C04B35/46C04B35/628C04B35/63C04B35/626C04B35/82
CPCC09C1/3661B01D53/8628B01D2258/0283B01J23/002B01J23/8885B01J2523/00C04B35/46C04B35/62605C04B35/62807C04B35/6316C04B35/82C04B38/0006C04B2235/3229C04B2235/3239C04B2235/3256C04B2235/3258C04B2235/96C04B2235/9607C09C3/063B01J2523/3712B01J2523/41B01J2523/47B01J2523/55B01J2523/68B01J2523/69C04B38/0074
Inventor 丁建峰
Owner 无锡市华东电力设备有限公司