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Process and apparatus for preparing dispersed composite nanometer TiO2/SiO2 particle

A nano-composite, disperse phase technology, applied in the direction of titanium oxide/hydroxide, silicon dioxide, titanium dioxide, etc., to achieve the effect of easy industrial production, convenient operation and simple equipment structure

Inactive Publication Date: 2006-08-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to provide a kind of dispersed phase TiO 2 / SiO 2 Nanocomposite particle preparation method and equipment to overcome the defects of the existing liquid phase method and meet the needs of large-scale continuous production of nanocomposite particles

Method used

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  • Process and apparatus for preparing dispersed composite nanometer TiO2/SiO2 particle
  • Process and apparatus for preparing dispersed composite nanometer TiO2/SiO2 particle
  • Process and apparatus for preparing dispersed composite nanometer TiO2/SiO2 particle

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Effect test

Embodiment 1

[0045] Device parameters:

[0046] The height of said combustion reactor 15 is 0.3 meters, and its diameter is 0.05 meters;

[0047] The flow cross-sectional area of ​​the central tube 101 is 12mm 2 , the flow cross-sectional area of ​​the second ring pipe 102 is 22m 2,, the flow cross-sectional area of ​​the three-ring pipe 103 is 34mm 2 , the cross-sectional area of ​​the four-ring pipe 104 is 100mm 2

[0048] Titanium tetrachloride (0.5L / h), silicon tetrachloride (1.2L / h), hydrogen (1.0m 3 / h) and air (3m 3 The mixed gas of / h) passes into the central tube 101 of the quadruple jet tube and enters the combustion reactor 15;

[0049] Set the temperature to 50°C (0.6m 3 / h) and hydrogen (0.6m 3 / h) pass into combustion reactor 15 by two ring pipes;

[0050] Air at a temperature of 80°C (6m 3 / h) pass into the combustion reactor 15 by the three-ring pipe 103;

[0051] Air at a temperature of 80°C (10m 3 / h) pass into the combustion reactor 15 by the four-ring pipe 1...

Embodiment 2

[0055] Device parameters:

[0056] The height of said combustion reactor 15 is 2.5 meters, and its diameter is 0.4 meters;

[0057] The flow cross-sectional area of ​​the central tube 101 is 220mm 2 , the flow cross-sectional area of ​​the second ring pipe 102 is 130mm 2 ,, the flow cross-sectional area of ​​the three-ring pipe 103 is 260mm 2 , the flow cross-sectional area of ​​the four-ring pipe 104 is 600m 2 ;

[0058] Titanium tetrachloride (30L / h), silicon tetrachloride (30L / h), hydrogen (10m 3 / h) and air (35m 3 The mixed gas of / h) passes into the central tube 101 of the quadruple jet tube and enters the combustion reactor 15;

[0059] Air at a temperature of 50°C (5m 3 / h) and hydrogen (3m 3 / h) pass into combustion reactor 15 by two ring pipes;

[0060] Air at a temperature of 20°C (40m 3 / h) pass into the combustion reactor 15 by the three-ring pipe 103;

[0061] Air at a temperature of 20°C (60m 3 / h) pass into the combustion reactor 15 by the four-ring ...

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Abstract

The present invention discloses the preparation process of dispersed composite nanometer TiO2 / SiO2 particle. The preparation process includes pre-mixing TiCl4, SiCl4, H2 and air in certain volume proportion, and hydrolysis reaction of the mixture in the central ring of burning reactor at 1200-2500 deg.c to produce dispersed composite nanometer TiO2 / SiO2 particle in the form between the nanometer spherical TiO2 particle and nanometer chain SiO2 particle and depending on the Ti / Si molar ratio. Inside the composite nanometer TiO2 / SiO2 particle, nanometer crystal TiO2 is dispersed in amorphous SiO2 base to form the dispersant structure. Inside the composite particle, there are Ti-O-Si bond and SiO2 to inhibit the growth TiO2 crystal grain and the conversion from anatase phase to rutile phase. Altering the Si content can controls the content of the anatase phase and the composite particle granularity.

Description

technical field [0001] The present invention relates to a kind of dispersed phase TiO 2 / SiO 2 Preparation method of nanocomposite particles. Background technique [0002] Nano-TiO 2 Particles have high reactivity, good visible light permeability, and good photocatalytic activity, and are widely used as catalysts or catalyst supports for photocatalytic reactions; TiO 2 -SiO 2 Nanocomposite photocatalysts can not only improve TiO 2 Surface active sites, increase surface area, increase surface hydroxyl content, improve dispersion, SiO 2 The presence of TiO can also inhibit the 2 phase transformation and grain growth, enhancing its thermal stability. In order to meet the requirements of applications in different fields, people have developed nano-TiO 2 -SiO 2 A variety of preparation techniques for composite materials, such as sol-gel method (Sol-Gel), chemical phase deposition (CVD), gas phase combustion synthesis, etc. Compared with other nanomaterial synthesis meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113C01B33/18C01G23/047
Inventor 李春忠胡彦杰丛德滋姜海波
Owner EAST CHINA UNIV OF SCI & TECH
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