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Method for preparing supported nanometer gold catalyst by laser deposition

A laser deposition and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low carbon monoxide oxidation activity and non-green catalyst preparation process , complex preparation process and other issues, to achieve the effect of great implementation value, important social and economic benefits, and high catalytic activity

Inactive Publication Date: 2009-11-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Steinbach et al [Steinbach G, Van der Lingen E.Gold 2003.New Industrial Application of Gold Conference, Vancouver, 28 September-1 October 2003] prepared alumina-supported gold catalyst by co-precipitation method, but the carbon monoxide oxidation activity of the catalyst was not high
[0008] The above-mentioned various methods for preparing nano-gold supported catalysts have inherent disadvantages: (1) the preparation process is complicated; (2) there are many influencing factors; (3) the non-greening of the catalyst preparation process, etc.
There is no report on the preparation of nano-gold catalysts by pulsed laser precipitation

Method used

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  • Method for preparing supported nanometer gold catalyst by laser deposition
  • Method for preparing supported nanometer gold catalyst by laser deposition
  • Method for preparing supported nanometer gold catalyst by laser deposition

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Embodiment 1

[0032] Alumina-supported gold nanoparticles prepared by laser deposition. Alumina was placed directly on the bottom of the laser deposition cell and the support was heated to 25 °C. First replace the air in the deposition tank with Ar, then evacuate to 80Pa, and start magnetic stirring to make the alumina flow. The metal Au is processed into a disc with a thickness of 1 mm and a diameter of 10 mm, which is placed in the center of the deposition pool. Under the condition of vacuum 80Pa, the pulsed laser is focused on the surface of the Au sheet, the laser voltage is 250V, and the focus point is moved to excite the Au atoms to form an atomic beam, which is sputtered to the surroundings and uniformly deposited on the surface of the flowing alumina. The deposition time is controlled as 30min, obtain alumina supported metal Au catalyst, its transmission electron microscope (TEM) is shown in figure 2 , Au nanoparticles with an average diameter of 9 nm. As analyzed by plasma emis...

Embodiment 2

[0034] Alumina supported gold prepared by laser deposition method. Alumina is placed directly on the bottom of the laser deposition cell and the support is heated to 300 °C. First replace the air in the deposition tank with Ar, then evacuate to 80Pa, and start magnetic stirring to make the alumina flow. The metal Au is processed into a disc with a thickness of 1 mm and a diameter of 10 mm, which is placed in the center of the deposition pool. Under the condition of a vacuum of 120Pa, the pulsed laser is focused on the surface of the Au sheet, the laser voltage is 250V, and the focus point is moved to excite the Au atoms into atomic beams, which are sputtered to the surroundings and uniformly deposited on the surface of the flowing alumina. The deposition time is 30min, obtain aluminum oxide supported metal Au, its transmission electron microscope (TEM) is shown in image 3 , showing that the average diameter of Au nanoparticles is 9 nm, and the loading of Au is 0.15% accordi...

Embodiment 3

[0036]Alumina supported gold prepared by laser deposition method. Alumina is placed directly on the bottom of the laser deposition cell and the support is heated to 600°C. First replace the air in the deposition tank with Ar, then evacuate to 80Pa, and start magnetic stirring to make the alumina flow. The metal Au is processed into a disc with a thickness of 1 mm and a diameter of 10 mm, which is placed in the center of the deposition pool. Under the condition of vacuum 80Pa, the pulsed laser is focused on the surface of the Au sheet, the laser voltage is 250V, and the focus point is moved to excite the Au atoms to form an atomic beam, which is sputtered to the surroundings and uniformly deposited on the surface of the flowing alumina. The deposition time is 30min. , to obtain alumina-loaded metal Au, whose transmission electron microscope (TEM) is shown in Figure 4 , showing that the average diameter of Au nanoparticles is 13nm, and the loading of Au is 0.18% according to ...

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Abstract

The invention discloses a method for preparing a supported nanometer gold catalyst by laser deposition, which comprises the following steps: hanging and fixing metal Au on the middle part of a laser deposition pond; putting a carrier in the laser deposition pond at a position closer to the bottom than the metal Au; heating the carrier to 25-600 DEG C and stirring the carrier so as to ensure that the carrier is in a moving state; under a vacuum condition and the protection of inert gas, focusing pulsed laser onto the surface of the metal Au by a laser so as to excite Au atoms into an atomic beam which is directionally and uniformly deposited on the surface of the carrier; and obtaining the supported nanometer gold catalyst. The preparation method has simple operation and no environmental pollution, and the prepared supported nanometer gold catalyst has higher catalytic activity, selectivity and stability. The supported nanometer gold catalyst can be applied to the fields of fuel-cell catalysts, carbon monoxide oxidation catalysts, catalytic hydrogenation catalysts, catalytic reforming catalysts, and the like and has greater implementation values and important social and economic benefits.

Description

(1) Technical field [0001] The invention relates to a preparation method of a loaded nano-gold catalyst. (2) Background technology [0002] The catalytic activity of supported nano-gold catalysts was discovered in the 1990s and has attracted the attention of scientists. It has been found that gold catalysts have high catalytic activity in many reactions (such as NO reduction reaction, CO preferential oxidation reaction in hydrogen-rich environment, hydrocarbon oxidation reaction, propylene epoxidation reaction, selective hydrogenation reaction. Gold catalysts show catalytic activity The nanometer size of gold is between 5-10nm, so the preparation method of gold nanocatalyst is its difficulty. [0003] The impregnation method is a commonly used method for preparing nano-gold supported catalysts. Liu et al. 2 The catalyst is first reduced under the hydrogen atmosphere at 500°C, then roasted at 400°C with 20% oxygen, and then reduced at 200°C under the hydrogen atmosphere to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C23C14/24C23C14/54
Inventor 严新焕江玲超
Owner ZHEJIANG UNIV OF TECH
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