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Preparation method of high specific area and high dispersity silicone-titanium compound oxide

A composite oxide and high specific surface technology, which is applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of high cost and small specific surface, and achieve high specific surface and high dispersion , cost reduction effect

Inactive Publication Date: 2003-02-05
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no complete TiO in the composite oxide prepared by this method 2 The crystal form appears, the specific surface is 300m 2 / g, but it still does not break away from the use of titanium alkoxide as a titanium source, which has the disadvantages of small specific surface area and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve 25ml of TEOS in 40ml of ethanol, add 13.4ml of acetic acid, 20.6ml of water, mix well, add 0.48ml of TiCl dropwise under the protection of inert gas 4 , continue to stir for 30 minutes, age at room temperature for 3 hours, dry at 60°C, and bake at 500°C to obtain a silicon-titanium composite oxide. The specific surface of silicon-titanium composite oxide is 703.5m 2 / g, XRD results showed no TiO 2 crystal form appears. The molar ratio of each component of the raw material is: 1:0.04:6.1:2.07:10.2.

Embodiment 2

[0017] Dissolve 25ml of TEOS in 70ml of ethanol, add 15.2ml of acetic acid, 21.8ml of water, mix well, add 1.03ml of TiCl dropwise under the protection of inert gas 4 , continue to stir for 30 minutes, age at room temperature for 5 hours, dry at 70°C, and bake at 550°C to obtain a silicon-titanium composite oxide. The specific surface of the silicon-titanium composite oxide is 681.3m 2 / g, XRD results showed no TiO 2 crystal form appears. The molar ratio of each component of the raw material is: 1:0.08:13.3:2.35:10.8.

Embodiment 3

[0019] Dissolve 20ml of TEOS in 70ml of ethanol, add 12.3ml of acetic acid, 19.0ml of water, mix well, add 1.85ml of TiCl dropwise under the protection of inert gas 4 , continue to stir for 30 minutes, age at room temperature for 10 hours, dry at 90°C, and bake at 500°C to obtain a silicon-titanium composite oxide with a specific surface of 670.6m 2 / g, XRD results showed no TiO 2 crystal form appears. The molar ratio of each component of the raw material is: 1:0.188:13.3:2.38:11.8.

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Abstract

The preparation method of silico-titanium compound oxide with high specific surface area and high dispersity adopts ethyl metasilicate as silicon source, adopts titanium tetrachloride as titanium source, uses acetic acid as hydrolysis catalyst, makes them undergo the processes of cohydrolysis and polycondensation in ethyl alcohol medium and synthesize the invented product by one-step process.

Description

Technical field: [0001] The invention belongs to a method for preparing composite oxides, in particular to one-step synthesis of silicon-titanium composite oxides with high specific surface area and high degree of dispersion by a sol-gel method. Background technique: [0002] Silicon-titanium composite oxide can be used as a photocatalyst to degrade organic pollutants in water, purify indoor air, and can also be used for waste gas treatment, such as NO x , CO, SO 2 Wait. Silicon-titanium composite oxides are also quite active in some acid-catalyzed reactions, such as: phenol amination, ethylene hydration, butene isomerization and other reactions. It is also used as a catalyst carrier to disperse metals to improve catalyst activity. Based on its wide application prospects, researchers at home and abroad are designing and synthesizing TiO 2 -SiO 2 Composite oxides include a lot of meaningful explorations on the influence of preparation methods, hydrolysis conditions, tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/025C04B35/624
Inventor 许临萍赵永祥刘滇生武志刚
Owner SHANXI UNIV
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