Method for preparing porous ceramics supported high activity nano titanium dioxide

A nano-titanium dioxide and porous ceramic technology is applied in the field of high-activity TiO2 photocatalyst preparation to achieve the effects of small gas resistance, large contact area and high catalytic activity

Inactive Publication Date: 2004-07-14
HUABENGUANG CATALYTIC TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Loaded on porous ceramic surfaces by various methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) At room temperature, add 0.5ml of tetrabutyl titanate dropwise to 100.0ml of anhydrous methanol, stir for 10min, then add 0.1ml of 0.1mol / l nitric acid solution, pH=4, continue stirring for 10min to obtain clear and transparent Sol, used after aging for 48h.

[0026] (2) Weigh 0.1g P-25 titanium dioxide powder from Germany Degussa Company and slowly add it into the sol of step (1), stir vigorously for 0.1h, add 0.05g of PEG2000 and stir for 0.1h, then add 0.01ml of ethyl orthosilicate and stir 0.1h, then add 3.4×10 -4 gFeCl 3After continuing to stir for 0.1h, the photocatalyst solution was obtained, and the photocatalyst was loaded on the porous ceramic pottery by thermal spraying method. After drying at room temperature for one day, it was fumigated in a hot air oven for 0.1h under a water vapor atmosphere, and then put into a muffler furnace. Carry out sintering, control the heating rate of 1k / min, heat up to 250°C and sinter at a constant temperature for 0.5h, ...

Embodiment 2

[0028] (1) At room temperature, add 25.0ml of tetrabutyl titanate dropwise into 100.0ml of isopropanol, stir for 40 minutes, then add 4.5ml of 0.1mol / l nitric acid solution, pH=1 and continue stirring for 30 minutes to obtain a clear and transparent sol , used after aging for 96h.

[0029] (2) Weigh 5.0g of PC105 powder produced by Millennium Chemicals in the United States and slowly add it to the above sol, stir vigorously for 6.0h, add 1.5g of PEG2000 and stir for 3.0h, then add 0.5ml of tetraethyl orthosilicate and stir for 1.0h, then add 1.08g of Ce (NO 3 ) 3 Continue to stir for 0.5h to obtain a photocatalyst solution. Use the method of spin spraying to load the photocatalyst on the porous ceramics. After drying at room temperature for three days, fumigate in a hot air oven for 4.0h in a water vapor atmosphere, and then put it in a muffler furnace for sintering. , control the heating rate of 1k / min, heat up to 250°C for sintering at a constant temperature for 2.0h, cont...

Embodiment 3

[0031] (1) At room temperature, add 4.5ml of di-n-butoxydititanium dropwise to 100.0ml of acetone, stir for 30min, then add 1.5ml of 1.0mol / l acetic acid solution, pH=3 and continue stirring for 10min to obtain a clear and transparent sol , used after aging for 72h.

[0032] (2) Weigh 1.1g of laboratory-made TiO 2 Slowly add the powder into the above sol, stir vigorously for 1.0h, add 1.0ml of PEG600 and stir for 1.0h, then add 0.1ml of magnesium silicate and stir for 0.5h, then add 0.016.gCe(NO 3 ) 3 Continue to stir for 1.0h to obtain a photocatalyst solution, soak the porous ceramic in the photocatalyst solution, take it out after 5min and dry it at room temperature for two days, then fumigate it in a hot air oven for 1.1h under a water vapor atmosphere, and then put it into a muffler furnace for sintering. The heating rate is 2k / min, the temperature is raised to 250°C for sintering at a constant temperature for 1.2h, the temperature is further raised to 420°C, and then s...

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PUM

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Abstract

The present invention relates to the preparation of high activity TiO2 photocatalyst with porous ceramic base, and is especially the nano titania powder and titania sol combining process of preparing regenerable high activity nano titania carried in porous ceramic. The present invention prepares the high activity nano titania carried in porous ceramic through the combination of two carrying processes, titania powder sintering process and sol-gel process. The process includes preparing titania sol via sol-gel process, mixing titania sol and titania powder in certain ratio while stirring and adding dispersant and adhesive to form new solution, carrying the solution to the surface of porous ceramic, fumigating the carrying ceramic in water vapor atmosphere to eliminate most of the organic matters, and final sintering at high temperature for strong combination between nano titania and carrier and raised activity of titania.

Description

technical field [0001] The invention belongs to highly active TiO with porous ceramics as the matrix 2 In the field of photocatalyst preparation, it particularly relates to a method for preparing reproducible porous ceramic-loaded high-activity nano-titanium dioxide by combining nano-titanium dioxide powder and titanium dioxide sol. Background technique [0002] Preparation of supported nano TiO 2 The most commonly used photocatalyst methods are the following two methods: one is the powder sintering method, which dissolves titanium dioxide ultrafine powder in water or alcohols to form a suspension, and then uses ultrasonic grinding or direct use. The carrier is immersed for a certain period of time and then taken out. The granular carrier needs to be stirred so that a certain amount of TiO is attached to the surface of the carrier 2 Or directly loaded on the carrier by other methods. As disclosed in the application number 99102734.5, nano-titanium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/00
Inventor 王怀颖江雷
Owner HUABENGUANG CATALYTIC TECH BEIJING
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