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A kind of flue gas denitrification titanium dioxide and preparation method thereof

A technology of titanium dioxide and nano-titanium dioxide, which is applied in separation methods, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of high porosity, crystal transformation, and large pollution.

Active Publication Date: 2015-09-09
广西蓝星大华化工有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the defects that the current domestic flue gas denitrification titanium dioxide is prone to particle agglomeration, crystal transformation, high energy consumption and large pollution during slurry modification and high-temperature sintering by using metatitanic acid, and proposes a flue gas denitration titanium dioxide. The titanium dioxide is made of ordinary anatase titanium dioxide as the main body, and the porous nano metal oxide is used as the dispersion carrier. Using the characteristics of high porosity and large specific surface area of ​​the porous nano metal oxide, the surface of the titanium dioxide is fully exposed in a fine state. And use the modifier to modify the surface of titanium dioxide particles, so as to generate a larger redox potential and greatly improve the catalytic activity

Method used

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  • A kind of flue gas denitrification titanium dioxide and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] 1) 80 parts by weight of anatase titanium dioxide and 10 parts by weight of template-based nanoporous zinc oxide were finely divided in a high-speed airflow micronizer at a speed of 2000 rpm, and at the same time, microwave excitation was turned on for cracking and refining, and the reaction was 8 minutes. Under the dual action of mechanical force and microwave, the crystal lattice of white powder will slip, dislocate, and move, and will be gradually divided by the steric hindrance of porous nano-metal oxides, and the crystal grains will gradually decrease, forming chemical activation points and surface oxygen vacancies, and obtaining grains. Nano-titanium dioxide dispersion with uniform diameter distribution;

[0034] 2) Add 2 parts by weight of sodium sulfate and 0.2 parts by weight of citric acid buffer into step 1), turn off the microwave, and finely disperse and react for 10 minutes at a speed of 1200rpm, and make the sulfate in the modifier Slowly activate and att...

Embodiment 2

[0038] 1) Micronize 75 parts by weight of anatase titanium dioxide and 15 parts by weight of nanoporous alumina in a high-speed airflow micronizer at a speed of 1500rpm. Under the dual action of mechanical force and microwave, the crystal lattice appears sliding, dislocation, and moving, and is gradually divided by the steric hindrance of porous nano-metal oxides, and the grains gradually decrease, forming chemical activation points and surface oxygen vacancies, and obtaining uniform particle size. State-distributed nano-titanium dioxide dispersion;

[0039] 2) Add 4 parts by weight of magnesium sulfate and 0.3 parts by weight of boric acid into step 1), turn off the microwave, finely disperse and react for 15 minutes at a speed of 1200rpm, and slowly activate the sulfate group in the modifier under the action of a buffer Attached to the surface of nano-titanium dioxide, the activity is greatly improved;

[0040] 3) Add 3-5 parts by weight of stibnite powder and 1 part by wei...

Embodiment 3

[0043] 1) Micronize 70 parts by weight of anatase titanium dioxide and 12 parts by weight of nanoporous magnesium oxide in a high-speed airflow micronizer at a speed of 2000rpm, and at the same time turn on microwave excitation to burst and refine, and react for 8 minutes. Under the dual action of mechanical force and microwave, the crystal lattice appears sliding, dislocation, and moving, and is gradually divided by the steric hindrance of porous nano-metal oxides, and the grains gradually decrease, forming chemical activation points and surface oxygen vacancies, and obtaining uniform particle size. State-distributed nano-titanium dioxide dispersion;

[0044] 2) Add 6 parts by weight of calcium sulfate and 0.5 parts by weight of tartaric acid to step 1), turn off the microwave, finely disperse and react for 20 minutes at a speed of 1500 rpm, and slowly activate the sulfate in the modifier under the action of the buffer Attached to the surface of nano-titanium dioxide, the act...

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Abstract

This invention provides flue gas denitrification titanium dioxide and a preparation method thereof. The flue gas denitrification titanium dioxide is characterized by comprising the following constituents in part by weight: 70 to 80 parts of anatase titanium dioxide, 10 to 15 parts of dispersion supporter, 3 to 5 parts of current-carrying conductor, 2 to 6 parts of modifier, 0.1 to 0.5 part of a buffer agent and 1 to 2 parts of a dispersing agent. The method has the advantages that titanium dioxide is continuously burst to be completely superfine till being nano-particles under effects of a high speed airflow pulverizer and microwave, the characteristics of high void ratio and large specific surface area of porous nanocrystalline metal oxide are utilized, the particle size of nano titanium dioxide is kept to be 5 to 10nm through the steric hindrance and the buffering of titanium dioxide, the nano titanium dioxide is uniformly distributed, the molecule space distance of porous nanocrystalline metal oxide ensures that titanium dioxide particles which are at nano particle size state are at a uniformly dispersed loose state, the surface of titanium dioxide which is at a superfine state is completely exposed, and the surface of titanium dioxide particles is modified through the modifier, so that high redox potential is generated, and the catalytic activity is greatly improved. The method does not need high-temperature sintering reaction, does not discharge pollutant, greatly reduces the production cost, avoids particle aggregation and crystal transfer which are easy to occur during metatitanic acid slurry modification and sintering processes adopted in traditional denitrification nano titanium dioxide, and can be widely applied to denitrification catalyst carrier for fire coal discharged flue gas in industrial waste gas, industrial fire coal, thermal power generation and the like.

Description

technical field [0001] The invention relates to the field of environmental protection materials, in particular to a titanium dioxide used as a flue gas denitration catalyst, and further relates to a preparation method of the flue gas denitration titanium dioxide. Background technique [0002] Coal-fired power plants and various industrial boilers emit a large amount of harmful substances such as smoke, sulfur dioxide, and nitrogen oxides, which are the main causes of air pollution, acid rain, and greenhouse effects. my country has launched large-scale flue gas desulfurization projects, but flue gas denitrification It has not yet been developed on a large scale. With the rapid development of the economy and the continuous increase of coal consumption, the air pollution caused by coal combustion is becoming more and more serious, especially the nitrogen oxides (NOX) in the flue gas of coal combustion has become one of the main pollutants of air pollution. Nitrogen oxides (NOX)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01D53/86B01D53/56
Inventor 陈庆曾军堂
Owner 广西蓝星大华化工有限责任公司