Preparation method of tio2-wo3 composite powder used as catalyst carrier

A catalyst carrier and composite powder technology, which is applied in the direction of catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of not involving the preparation technology of titanium dioxide and tungsten trioxide composite powder, and the inability to obtain high-performance titanium dioxide products, etc. problems, to achieve high product specific surface area, high product performance and good effect

Inactive Publication Date: 2011-12-28
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, the titanium dioxide product with a certain grain size cannot be

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 10Kg metatitanic acid (according to TiO 2Add a certain amount of deionized water to the reactor with a stirring device, and adjust the slurry concentration to 18-22wt%; after stirring evenly, add ammonia water to the slurry to adjust the pH value to 8.5; after fully stirring, filter to obtain solid Phase filter cake, the solid phase filter cake is beaten into a 24-30wt% slurry again, and ammonium metatungstate (AMT) solution is added to the slurry to make the mass of tungsten trioxide relative to the sum of the mass of titanium dioxide and tungsten trioxide The ratio is 5.0wt%; the slurry after the above treatment is directly sent to the drying and calcining device by a piston pump, dried at 200°C to 350°C for 2.5 hours, and then calcined at 350°C to 580°C for 3.5 hours. The calcination at 350°C to 580°C for 3.5 hours specifically refers to calcination at 350°C to 420°C for 1 hour, and calcination at 420°C to 580°C for 2.5 hours. The calcined material is pulveriz...

Embodiment 2

[0033] Weigh 10Kg metatitanic acid (according to TiO 2 meter), add it into the reactor with a stirring device, beat and disperse the metatitanic acid, and use deionized water to adjust to TiO 2 The slurry concentration of 15~18wt% is calculated. Add ammonia water to the slurry to adjust the pH value to 6.5~7.0. Filter the treated metatitanic acid. Slurry the filter cake again, using deionized water to adjust to TiO 2 The slurry concentration of 24wt%. Add ammonium metatungstate solution with a concentration of 71.4% to the slurry in proportion, and the proportion of ammonium metatungstate added is 4.0wt%, calculated based on the mass of tungsten trioxide relative to the sum of titanium dioxide and tungsten trioxide. The slurry treated in the above steps is directly driven into the drying and calcining device through a piston pump for drying and calcining. After drying at 200°C to 350°C for 2.5 hours, it is calcined at 350°C to 420°C for 1 hour, and at 420°C to 580°C for 2....

Embodiment 3

[0035] Weigh 10Kg metatitanic acid (according to TiO 2 meter), add it into the reactor with a stirring device, beat and disperse the metatitanic acid, and use deionized water to adjust to TiO 2 The slurry concentration of 18~20wt% is calculated. Add ammonia water to the slurry to adjust the pH value to 7.0~7.5. The treated metatitanic acid is filtered to obtain a solid phase filter cake. Slurry the solid phase filter cake again, using deionized water to adjust to TiO 2 The slurry concentration of 30wt% is calculated. At this time, ammonium metatungstate solution with a concentration of 65% is added in proportion to the slurry, and the ratio of tungsten trioxide to the mass sum of titanium dioxide and tungsten trioxide is 6.0wt%. Put the slurry directly into the drying and calcining device through a piston pump for drying and calcination. After drying at 200°C-350°C for 2.5 hours, calcining at 350°C-420°C for 1 hour, and calcination at 420°C-580°C for 2.5 hours. The calcin...

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Abstract

The invention discloses a preparation method for TiO2-WO3 composite powder used as a catalyst carrier. The method comprises the following steps: dispersing the raw material metatitanic acid through beating, and adjusting the concentration of obtained slurry to be 15 to 25% on the basis of the mass percentage of TiO2; adding ammonia liquor into the slurry and adjusting the pH value of the slurry to be 6.5 to 9.0; filtering the slurry to obtain a solid phase filter cake; beating the solid phase filter cake again, and adjusting the concentration of obtained slurry to be 24 to 30% on the basis ofthe mass percentage of TiO2; adding an ammonium metatungstate solution in proportion, wherein, the proportion of addition amount of ammonium metatungstate is 4.0% to 10.0% with the mass of titanium dioxide as reference; directly pumping the slurry treated in the previous steps into a drying calcination apparatus for drying and calcining, and crushing blanking materials of a calcination kiln to obtain a finished product. The preparation method has the characteristics of low manufacture cost and a simple process; the prepared product has the advantages of a high specific surface area, high surface chemical activity, high catalysis efficiency and good processing performance.

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 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 oxides are also an important greenhouse gas. The impact of the greenhouse effect on the same amount is several times that of carbon dioxide. Ten times to hundreds of 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 n...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/06B01J23/30B01D53/86B01D53/56
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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