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Method and equipment for preparing nucleocapsid type TiO2/SiO2 nano composite granule

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

Inactive Publication Date: 2006-10-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention is to provide a kind of core-shell type 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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  • Method and equipment for preparing nucleocapsid type TiO2/SiO2 nano composite granule
  • Method and equipment for preparing nucleocapsid type TiO2/SiO2 nano composite granule
  • Method and equipment for preparing nucleocapsid type TiO2/SiO2 nano composite granule

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Device parameters:

[0043] The height of said combustion reactor 15 is 0.3 meters, and its diameter is 0.05 meters;

[0044] 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 flow cross-sectional area of ​​the four-ring pipe 104 is 100mm 2

[0045]Titanium tetrachloride (1.2L / h) was evaporated at 120°C with air (3m 3 / h) mixed, preheated to 100 ℃ and hydrogen (1.0m 3 / h) mix and pass into central tube 101;

[0046] Into the second ring pipeline into the air (0.6m 3 / h) and hydrogen (0.6m 3 / h) mixed gas at a temperature of 50°C;

[0047] Air (6m 3 / h) preheated to 70°C by the second preheater 12, silicon tetrachloride (1.2L / h) evaporated at 70°C, mixed and passed into the three-loop pipe 103;

[0048] Air is introduced into the four-ring pipe (10m 3 / h), the temperature is 80°C;

[0049] Under th...

Embodiment 2

[0053] The height of said combustion reactor 15 is 2.5 meters, and its diameter is 0.4 meters;

[0054] 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 ;

[0055] Titanium tetrachloride (40L / h) was evaporated at 250°C, and air (30m 3 / h) mixed, preheated to 200 ° C and hydrogen (12m 3 / h) mix and pass into central tube 101;

[0056] Into the second ring pipeline into the air (10m 3 / h) and hydrogen (7m 3 / h) mixed gas at a temperature of 50°C;

[0057] Air (20m 3 / h) preheated to 200°C by the second preheater 12, silicon tetrachloride (20L / h) evaporated at 200°C, mixed and passed into the three-ring pipe 103;

[0058] Air is introduced into the four-ring pipe (100m 3 / h) The temperature is 20°C;

[0059] Under the condition that the r...

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Abstract

The invention discloses a method for preparing a core-shell TiO2 / SiO2 nano composite grain, using titanium tetrachloride, silicon titanium tetrachloride, hydrogen gas and air as raw materials, putting them into various links of a premixing combustion reactor for hydrolyzation reaction at 1200-2500 deg.C. And the produced grain is 20-80 nm sized, amorphous SiO2 relatively uniformly coats the crystalline TiO2 grain, where the coating is 2-30 nm thick, and size of TiO2 core and thickness of coating SiO2 can be regulated by variation of process parameters. And the process device is simple, convenient to operate, and stable to run, and able to continuously prepare the grain.

Description

technical field [0001] The present invention relates to a kind of TiO 2 / SiO 2 Methods and devices for the preparation of nanocomposite particles. Background technique [0002] Nano-TiO 2 Particles have high reactivity, good visible light transmittance, and good photocatalytic activity, and are widely used as catalysts or catalyst supports for photocatalytic reactions. [0003] 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. [0004] 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 na...

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
Owner EAST CHINA UNIV OF SCI & TECH
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