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A tio for denitrification 2 -wo 3 -baso 4 Composite powder and its preparation method

A composite powder, tio2-wo3-baso4 technology, applied in the field of environmental protection, can solve the problems of denitration catalyst specific surface area reduction, weaken denitrification catalytic activity, etc., and achieve the effect of simple operation and simple equipment requirements

Active Publication Date: 2016-07-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that WO 3 The role in the denitrification catalyst can not be ignored, however, currently WO 3 The price of the precursor ammonium paratungstate is very high, and in the case of such fierce competition in the denitrification market, how to control the WO 3 The amount of addition makes it an important research and development direction for enterprises to reduce production costs on the premise of ensuring that the performance of the denitrification catalyst does not change.
[0005] Early research results showed that when WO in tungsten-containing titanium dioxide 3 When the amount of tungsten added is about 10%, the denitrification catalyst prepared by it has better anti-poisoning performance; while continuing to increase the tungsten content will reduce the specific surface area of ​​the denitrification catalyst, which will weaken the denitrification catalytic activity.

Method used

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  • A tio for denitrification <sub>2</sub> -wo <sub>3</sub> -baso <sub>4</sub> Composite powder and its preparation method
  • A tio for denitrification <sub>2</sub> -wo <sub>3</sub> -baso <sub>4</sub> Composite powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] WO 3 Content is 3wt%, BaSO 4 3 wt% TiO 2 -WO 3 -BaSO 4 Preparation of composite powders.

[0034] Step 1: 600 g of metatitanic acid solid was dissolved in 500 g of distilled water and stirred for 1 hour to obtain a metatitanic acid slurry.

[0035] Step 2: Mix and transfer ammonium paratungstate and barium sulfate to the slurry in step 1, and continue stirring for 30 minutes to obtain a mixed slurry of metatitanic acid, ammonium paratungstate and barium sulfate.

[0036] Step 3: Slowly add analytically pure ammonia solution dropwise to the mixed slurry in step 2, adjust the pH of the solution until the pH of the solution is 7, and continue stirring for 2 hours to obtain a titanium tungsten barium suspension.

[0037] Step 4: Put the obtained titanium-tungsten-barium mixture into an oven for direct drying, the drying temperature is 120° C., and the drying time is 24 hours.

[0038] Step 5: Put the obtained dry material into a rotary kiln for calcination. The calci...

Embodiment 2

[0047] WO 3 Content is 2wt%, BaSO 4 10wt% TiO 2 -WO 3 -BaSO 4 Preparation of composite powders.

[0048] Step 1: 40 g of metatitanic acid solid was dissolved in 100 g of distilled water and stirred for 1 hour to obtain a metatitanic acid slurry.

[0049] Step 2: Mix and transfer ammonium paratungstate and barium sulfate to the slurry in step 1, and continue stirring at 60°C for 30 minutes to obtain a mixed slurry of metatitanic acid, ammonium paratungstate and barium sulfate.

[0050] Step 3: Slowly add analytically pure ammonia solution dropwise to the mixed slurry in step 2, adjust the pH of the solution until the pH of the solution is = 11, and continue stirring for 2 hours to obtain a titanium tungsten barium suspension.

[0051] Step 4: Dry the obtained titanium-tungsten-barium mixture in a vacuum rake dryer at a temperature of 70°C, a rotation speed of 15r / min, a vacuum of 350Pa, and a drying time of 24 hours.

[0052] Step 5: Put the obtained dry material into a r...

Embodiment 3

[0055] WO 3 Content is 10wt%, BaSO 4 6 wt% TiO 2 -WO 3 -BaSO 4 Preparation of composite powders.

[0056] Step 1: 50 g of metatitanic acid solid was dissolved in 100 g of distilled water and stirred for 1 hour to obtain a metatitanic acid slurry.

[0057] Step 2: Mix and transfer ammonium paratungstate and barium sulfate to the slurry in step 1, and continue stirring at 110°C for 30 minutes to obtain a mixed slurry of metatitanic acid, ammonium paratungstate and barium sulfate.

[0058] Step 3: Slowly add analytically pure ammonia solution dropwise to the mixed slurry in step 2, adjust the pH of the solution until the pH of the solution is 8, and continue stirring for 2 hours to obtain a titanium tungsten barium suspension.

[0059] Step 4: Put the obtained titanium-tungsten-barium mixture into an oven for direct drying, the drying temperature is 100°C, and the drying time is 24 hours.

[0060] Step 5: Put the obtained dry material into a rotary kiln for calcination. Th...

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Abstract

The invention relates to TiO2-WO3-BaSO4 composite powder for denitration. The TiO2-WO3-BaSO4 composite powder for the denitration is prepared from 2-10% of WO3, 2-10% of BaSO4 and the balance being TiO2. The invention also provides a preparation method of the composite powder. The preparation method comprises the following steps: mixing titanium, tungsten and barium precursor solutions, adjusting the pH value of the solution with ammonia water to obtain titanium, tungsten and barium sulfate size, directly drying or drying the solution in a vacuum rake type manner, and acquiring the composite material with the required particle size through roasting and ball milling. The composite powder has the characteristics of moderate specific surface area (80-150m<2> / g), uniform particle size (3-15 microns), high hydrothermal stability, high sulfur-resisting aging capacity, low cost and the like, and meets the requirement of an SCR catalyst support; and the corresponding preparation method has the advantages of simplicity in operation, simple and convenient equipment requirement and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to related materials, in particular to a TiO used for denitrification 2 -WO 3 -BaSO 4 Composite powder and its preparation method. Background technique [0002] Nitrogen oxides (including NO, NO 2 and N 2 O, referred to as NO x ) is one of the main pollutants emitted by coal-fired power plants. Its pollution to the environment has been paid more and more attention by people, because it can not only cause acid rain and greenhouse effect, but also form chemical smog with hydrocarbons and ozone, and cause the destruction of the ozone layer. At present, a main method for removing nitrogen oxides is selective catalytic reduction (SCR) technology, and the core of this technology is the catalyst, and the performance of the catalyst directly affects the denitrification performance of the SCR system. [0003] The currently commonly used SCR catalysts in the world are pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053
Inventor 刘雪松吴晓东翁端许腾飞
Owner TSINGHUA UNIV
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