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TiO2-WO3-SiO2 composite powder used as catalyst carrier and preparation method thereof

A technology of tio2-wo3-sio2 and catalyst carrier, 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 catalyst carrier, not involving titanium dioxide, tungsten trioxide and dioxide Silicon composite powder preparation and other issues, to achieve the effect of high product performance, good processing performance and high strength

Inactive Publication Date: 2012-07-11
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, it is impossible to obtain a high-performance catalyst carrier titanium dioxide product.
[0007] None of the above methods involve the preparation of composite powders of titanium dioxide, tungsten trioxide and silicon dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of ammonia water: liquid ammonia is decompressed into ammonia gas, and the ammonia gas is passed into pure water to prepare concentrated ammonia water for later use.

[0045] Weigh 10Kg metatitanic acid (according to TiO 2 meter), add it to the reactor with a stirring device, add a certain amount of deionized water, and adjust the slurry concentration to 15-20wt%; after stirring evenly, add ammonium paratungstate (APT), white carbon black, and tungsten trioxide to the slurry The ratio of the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 5wt%, and the ratio of silicon dioxide to the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 5wt%; add ammonia water to the slurry to adjust the pH value to 7.2; Filtrate after full stirring, and the filter material obtained by filtering is massive metatitanic acid, so that the mass fraction of massive metatitanic acid titanium dioxide is 40% to 55%. The filter cake obtain...

Embodiment 2

[0049] Preparation of ammonia water: liquid ammonia is decompressed into ammonia gas, and the ammonia gas is passed into pure water to prepare concentrated ammonia water for later use.

[0050] Weigh 10Kg metatitanic acid (according to TiO 2 Add a certain amount of deionized water to the reactor with a stirring device, adjust the slurry concentration to 10-15wt%; after stirring evenly, add ammonium paratungstate (APT), white carbon black, and tungsten trioxide to the slurry The ratio of the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 4wt%, and the ratio of silicon dioxide to the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 7wt%; add ammonia water to the slurry to adjust the pH value to 6.8; Filtrate after full stirring, and the filter material obtained by filtering is massive metatitanic acid; the filter cake obtained after mechanically crushing massive metatitanic acid is dried at 200°C to 380°C for 2.5 hours, and the d...

Embodiment 3

[0053] Preparation of ammonia water: liquid ammonia is decompressed into ammonia gas, and the ammonia gas is passed into pure water to prepare concentrated ammonia water for later use.

[0054] Weigh 10Kg metatitanic acid (according to TiO 2 meter), add it to the reactor with a stirring device, add a certain amount of deionized water, and adjust the slurry concentration to 15-20wt%; after stirring evenly, add ammonium paratungstate (APT), white carbon black, and tungsten trioxide to the slurry The ratio of the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 10wt%, and the ratio of silicon dioxide to the weight sum of titanium dioxide, tungsten trioxide and silicon dioxide is 5wt%; add ammonia water to the slurry to adjust the pH value to 7.8; Filtrate after full stirring, and the filter material obtained by filtering is massive metatitanic acid; the filter cake obtained after mechanically crushing massive metatitanic acid is dried at 200°C to 380°C for...

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Abstract

The invention discloses and provides a preparation method of TiO2-WO3-SiO2 composite powder used as a catalyst carrier. The method sequentially comprises the following steps: dispersing a metatitanic acid raw material into the slurry through beating, and regulating the concentration of the slurry having the mass fraction of 10 percent to 20 percent and counted with titanium dioxide; respectively adding ammonium paratungstate and white carbon black into the slurry; adding ammonia water and regulating the pH value to be within the range of 5.5 to 8.5; filtering and dehydrating the slurry to obtain a blocky filter cake; mechanically grinding the blocky filter cake obtained after filtering and dehydrating, drying the ground filter cake for 2.5 hours at a temperature of 200 DEG C to 380 DEG C and calcining the dried filter cake for 4.5 hours at a temperature of 380 DEG C to 680 DEG C; and obtaining the TiO2-WO3-SiO2 composite powder after grinding calcined falling materials. The method disclosed by the invention has the advantages of low manufacturing cost, simple process, high specific surface area of a product, high surface chemical activity, and good processing performance. A denitration catalyst prepared from the product has the advantages of high strength, long service life, high catalytic efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of chemical product preparation, in particular to sulfated TiO used as a catalyst carrier 2 -WO 3 -SiO 2 Preparation method of composite powder. Background technique [0002] High-temperature combustion exhaust gas - flue gas contains a large amount of NOx (nitrogen oxides), which is one of the main air pollutants. Nitrogen oxides, mainly nitrogen monoxide and nitrogen dioxide, are an important cause of photochemical smog and acid rain. At the same time, nitrogen monoxide is also an important greenhouse gas. Under the same amount, its greenhouse effect is three times that of carbon dioxide. About a hundred times. Therefore, the denitrification treatment of flue gas is a very important and urgent task for environmental protection. SCR (Selective Catalytic Reduction) flue gas denitrification technology is currently the most effective technology commonly used in the world to solve atmospheric nitrogen oxid...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/30B01J35/10B01D53/86B01D53/56
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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