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Method for preparing denitration catalyst carrier TiO2-WO3 composite powder

A technology of denitrification catalyst and composite powder, which is applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of not being able to obtain high-performance titanium dioxide products, and achieve high specific surface area, good effect and low manufacturing cost. low effect

Inactive Publication Date: 2012-01-25
四川华铁钒钛科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not modify the metatitanic acid. By controlling the calcination temperature of the metatitanic acid and controlling the titanium dioxide product with a certain grain size, high-performance titanium dioxide products cannot be obtained, and the method does not involve the compounding of titanium dioxide and tungsten trioxide. Powder preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of ammonia water: The liquid ammonia is decompressed to ammonia gas, and the ammonia gas is used in pure water to prepare thick ammonia water and spare.

[0032] Called 10kg titanic acid (press TIO 2), Add a reactor with a mixing device, add a certain amount of ionic water, adjust the concentration of the pulp 15-25WT %; after stirring, add the ammonium ammonium (APT) to the slurry, tungsten tungstenThe proportion of tungsten oxide weight is 5WT%; the ammonia water adjustment pH value is added to the slurry to 8.5; after the filtration is filtered after full stirring, the filtering material obtained by the filtration is block titanic acid;Dry the filter cake at 200 ℃ ~ 350 ℃ for 2.5 hours, and the dried filter cakes are burned at 350 ℃ ~ 400 ℃ 煅 0.8 hours, 400 ℃ ~ 580 ℃ 煅 27 hours, and the burning kiln material obtained by shelter is crushed with shear type shear.The machine crushed and prepared a powder -like titanium dioxide -tungsten oxide composite powder.

...

Embodiment 2

[0036] Called 10kg titanic acid (press TIO 2 ), Add a reactor with a mixing device, add a certain amount of pure water, adjust the concentration of the pulp 15 to 20WT %; after stirring, add the ammonium ammonium (APT) to the slurry. Tungsten tungsten.The proportion of tungsten weight is 4WT%; adding the pH value of pure commercial ammonia water to the slurry to 6.5-7.5 is added to the slurry; after the filtration is filtered after fully stirring, the filter cake obtained by the filtration is block titanic acid;The filter cake obtained after the mechanical is broken at 200 ° C to 350 ° C. After drying for 2.5 hours, the dried filter cake is burned at 350 ° C to 400 ° C 煅 0.8 hours, 400 ℃ ~ 580 ℃ 煅 2.7 hours;The materials are crushed with shear crushing machines and prepared pink -like titanium dioxide -tungsten oxide composite powder products.

[0037] In this example, the raw material titanic acid refers to the concentrated, hydrolyzed, water washing, and bleaching of intermediat...

Embodiment 3

[0039] Preparation of ammonia water: The liquid ammonia is decompressed to ammonia gas, and the ammonia gas is used in pure water to prepare thick ammonia water and spare.

[0040] Called 10kg titanic acid (press TIO 2 ), Add a reactor with a mixing device, add a certain amount of ionic water, adjust the concentration of the pulp 20-25WT %; after stirring, add the ammonium ammonium (APT) to the slurry, tungsten tungstenThe proportion of tungsten oxide weight is 5.0WT%; the ammonia water adjustment pH value is added to the slurry to 8.0-9.0; after full stirring, filtering is filtered, and the filtering material obtained by the filtration is block titanic acid;The filter cakes obtained later are dried in 200 ° C to 350 ° C for 2.5 hours, and the dried filter cake is burned in the roasted equipment, including 350 ° C to 400 ° C 煅 0.8 hours, 400 ℃ ~ 580 ℃ 煅 2.7 hours;The falling kiln is crushed with a shear crusher to prepare a powder -like titanium dioxide -tungsten oxide composite p...

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Abstract

The invention discloses a method for preparing denitration catalyst carrier TiO2-WO3 composite powder, which comprises the following steps of: pulping and dispersing a metatitanic acid raw material; adjusting until the concentration of the slurry, calculated in terms of the titanium dioxide TiO2, is 15-25% by mass; adding ammonium paratungstate to the slurry according to a proportion, wherein calculated by the mass of tungsten trioxide WO3, the additive proportion of the ammonium paratungstate is 4.0%-10.0% of the sum of the TiO2 and the WO3; adding ammonia water to the slurry to adjust the pH to 6.5-9.0; filtering and dewatering to obtain a blocky filter cake; crushing the filter cake mechanically; drying and roasting the crushed filter cake at 200 DEG C to 580 DEG C for 6 hours; and crushing the roasted material falling in the kiln to obtain a TiO2-WO3 composite powder product serving as the denitration catalyst carrier. The method disclosed by the invention is low in manufacturing cost and simple in process; and the prepared product has the advantages of high specific surface area, high surface chemical activity, high catalytic efficiency and good processability.

Description

Technical field [0001] The present invention involves the field of chemical product preparation technology. Specifically, it involves a preparation of dehydrated catalyst carrier TIO 2 -Wo 3 Method of composite powder. Background technique [0002] High -temperature combustion emissions gas -flue gas contains a large amount of NOX (nitrogen oxides), and nitrogen oxides are one of the main air pollutants.Nitrogen oxides mainly nitric oxide and nitric oxide are an important cause of photochemical smoke and acid rain. At the same time, nitrogen oxides are also an important greenhouse gase.Ten to hundreds of times.Therefore, the denitration treatment of flue gas is a very important and urgent task of environmental protection.SCR (selective catalytic restoration) flue gas denitration technology is currently the most effective technology that is generally used in the world to solve atmospheric nitrogen oxide pollution.Under the action of a catalyst, the reducing agent of ammonia, urea ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/30B01J35/10B01D53/56B01D53/86
Inventor 王兰武李振兴章强
Owner 四川华铁钒钛科技股份有限公司
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