Aurum-ferric oxide/titanium dioxide nano-catalyst and preparation method thereof

A nano-catalyst, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc. The size and shape are easy to control, and the effect of reducing the variety

Inactive Publication Date: 2009-12-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of gold-iron oxide / titanium dioxide nano-catalyst with better thermal stability and higher activity for the problems such as poor stability of existing Au nano-catalysts

Method used

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  • Aurum-ferric oxide/titanium dioxide nano-catalyst and preparation method thereof
  • Aurum-ferric oxide/titanium dioxide nano-catalyst and preparation method thereof
  • Aurum-ferric oxide/titanium dioxide nano-catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation of 2% Au-Fe 3 o 4 (spherical) / TiO 2 nanocatalyst

[0027] Take 1.00g HAuCl 4 In a 250ml double-necked flask, quickly add 100ml CHCl 3 , then add 20ml oleylamine, shake and sonicate until the solution is a clear orange-red transparent solution. Under nitrogen protection, 0.50 g of tert-butylamine borane was added dropwise to the orange-red transparent solution under the condition of magnetic stirring at 30° C., and stirred for 15 min. After the reaction, add 400ml ethanol, centrifuge at 8000rpm for 5min, and disperse in 100ml CHCl 3 middle. (Such as figure 1 ) then get 70.0mg iron acetylacetonate and add 4ml oleylamine and 2.67ml oleic acid in a 25ml three-necked flask, vacuumize, fill with nitrogen repeatedly 3 times, get the CHCl of Au prepared above 3 Add 5ml of ethanol to 1ml of the solution (5mgAu), centrifuge at 4000rpm, and disperse the obtained precipitate in 2ml of oleylamine. Heat the solution in the three-necked flask to 180°...

Embodiment 2

[0028] Embodiment 2: Preparation of 5% Au-Fe 3 o 4 (square) / TiO 2 Nano catalyst:

[0029] Take 0.5g HAuCl 4 In a 250ml double-necked flask, quickly add 100ml CHCl 3 , then add 10ml oleylamine, shake and sonicate until the solution is a clear orange-red transparent solution, add 0.25g tert-butylamine borane dropwise to the above-mentioned orange-red transparent solution under the condition of nitrogen protection and magnetic stirring at 25°C Go, stir for 15min. After the reaction, add 200ml ethanol, centrifuge at 8000rpm for 5min, and disperse in 50ml CHCl 3 middle. Take 1 mL of the above Au in CHCl 3 Solution (5mgAu) into a microwave tube with a volume of 10mL, add 8mL of absolute ethanol, centrifuge at 6000rpm for 2min, pour off the supernatant, invert until most of the ethanol flows out, then add 1mL of oleic acid, add a magnet, cover the lid, 50 Stir in a water bath at ℃ until Au is completely dispersed, then add 40 mg of iron acetylacetonate, 40 mg of 1,2-hexadecan...

Embodiment 3

[0030] Embodiment 3: Preparation of 2.5% Au-Fe 3 o 4 (flower shape) / TiO 2 nanocatalyst

[0031] Take 1.5g HAuCl 4 In a 250ml double-necked flask, quickly add 150ml CHCl 3 , then add 30ml oleylamine, shake and sonicate until the solution is a clear orange-red transparent solution, add 0.75g tert-butylamine borane dropwise to the above-mentioned orange-red transparent solution under the condition of nitrogen protection and magnetic stirring at 35°C Go, stir for 15min. After the reaction, add 200ml ethanol, centrifuge at 8000rpm for 5min, and disperse in 150ml CHCl 3 middle. Take 1 mL of the above Au in CHCl 3 (5mgAu) into a microwave tube with a volume of 10mL, add 8mL of absolute ethanol, centrifuge at 6000rpm for 2min, pour off the supernatant, invert until most of the ethanol flows out, then add 1mL of oleic acid, add a magnet, cover the lid, 50 Stir in a water bath at ℃ until Au is completely dispersed, then add 50mg of iron acetylacetonate, 50mg of 1,2-hexadecanedio...

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Abstract

The invention relates to an aurum-ferric oxide / titanium dioxide nano-catalyst and a preparation method thereof, in particular to an Au nano-catalyst. The invention provides the aurum-ferric oxide / titanium dioxide nano-catalyst which has better heat stability and higher activity, and the preparation method thereof. The aurum-ferric oxide / titanium dioxide nano-catalyst has the general formula of Au-Fe3O4 / TiO2. The preparation method comprises: 0.5-1.5g of H AuCl4 is added into 100ml of chloroform solution]; then, 10-30ml of oleamide is added into the solution and 0.25-0.75g of tert-butyl amine borane is added into the solution so that Au nano-particles can be obtained; after that, the Au nano-particles and acetylacetone iron are added into oleic acid oleamide solution for reaction so that Au-Fe3O4 nano-particles can be obtained, and the mother liquid is reserved for standby application; the mother liquid is added with 0.05-1.6ml of titanium 4-butanol, and solid product can be obtained after decomposition; and the solid product is calcined, and the aurum-ferric oxide / titanium dioxide nano-catalyst is obtained.

Description

technical field [0001] The invention relates to an Au nano catalyst, in particular to a gold-iron oxide / titanium dioxide nano catalyst and a preparation method thereof. Background technique [0002] CO is a highly toxic gas, which can easily combine with the hemoglobin of the human body to cause hypoxia in the human body, and in severe cases, it can cause death. At the same time, it is one of the pollutants in the atmosphere. The catalytic oxidation of CO has a wide range of applications in automobile exhaust treatment, industrial gas treatment and anti-virus exhalation devices. As a catalyst, Au nanoparticles have the advantages of high efficiency, low dosage and catalytic activity at room temperature compared with common noble metal catalysts. However, Au nanocatalysts also have fatal shortcomings. Au nanoparticles will seriously aggregate and grow during sintering, reaction, and even placement. Once the Au nanoparticles grow to more than 10nm, the catalytic activity will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/08B01D53/62B01D53/86
Inventor 郑南峰张海吴炳辉
Owner XIAMEN UNIV
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