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A kind of highly active and stable highly dispersed nano-gold catalyst and preparation method thereof

A technology of stability and catalyst, applied in the direction of separation methods, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of catalysts that have not been tested or reported, and achieve species enrichment and enhanced capabilities , The effect of improving the catalytic reaction activity

Active Publication Date: 2022-04-01
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalysts described in the above existing patents have not been tested or reported

Method used

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  • A kind of highly active and stable highly dispersed nano-gold catalyst and preparation method thereof
  • A kind of highly active and stable highly dispersed nano-gold catalyst and preparation method thereof
  • A kind of highly active and stable highly dispersed nano-gold catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1%Au / 10 wt.% [ZnO-Zn(OH) 2 ] / Al 2 o 3 Preparation of:

[0043] 0.9 g Al 2 o 3 Placed in a beaker, poured 110mL ammonia solution (10 wt.%) and stirred for 2 h, and at 50 o C. Stand at constant temperature for 4 hours, so that the ammonium ions on the surface of the carrier and the ammonium ions in the solution reach equilibrium; after filtering and washing with water, the aminated composite carrier is obtained.

[0044] As attached to the manual figure 1 As indicated, infrared characterization analysis was carried out on the aminated sample in Example 1 and the non-aminated sample in Comparative Example 1 described later. References science , 2014, 345, 1599-1602; Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2014, 117, 707-712 spectrum analysis method, located at 3450cm in the infrared spectrum -1 The broad peak is the absorption peak of hydroxyl, 1518 cm -1 It is the absorption peak of N-H. It can be seen from the figure that comp...

Embodiment 2

[0060] 1%Au / 10 wt.% [MgO-Mg(OH) 2 ] / Al 2 o 3 Preparation of:

[0061] 0.90 g Al 2 o 3 Place in a beaker, pour 110 mL of ammonia solution (10 wt.%) and stir for 2 h, mix thoroughly, and o C. Stand at constant temperature for 4 hours, so that the ammonium ions on the surface of the carrier and the ammonium ions in the solution reach equilibrium; after filtering and washing with water, the aminated carrier is obtained.

[0062] The above aminated Al 2 o 3 Mix the composite carrier well in 50 mL deionized water, add 2 mol / L NaOH solution to adjust the pH to 9-10, and mix well; measure 0.527 mL HAuCl 4 Solution (gold mass concentration is 19.12g Au / L) and 0.9772 mL Mg(NO 3 ) 2 solution (c=2.539 mol / L), mix thoroughly; mix the above solution, stir for 2 h, and then age for 1 h; filter the above solution, and wash with water until there is no chloride ion in the filtrate, and then put the filter cake at 70 o C dried overnight, finally using air at 300 o After activation ...

Embodiment 3

[0071] 1%Au / 6 wt.% [Co 2 o 3 -Co(OH) 3 ] / TiO 2 Preparation of:

[0072] 0.94 g TiO 2 Put it in a beaker, add 45 mL deionized water and mix well, pour 25 mL urea solution (0.1 mol / L) and stir for 2 h, mix well, and o C. Stand at constant temperature for 4 hours, so that the ammonium ions on the surface of the carrier and the ammonium ions in the solution reach equilibrium; after filtering and washing with water, the aminated carrier is obtained.

[0073] The above aminated TiO 2 Mix the composite carrier well in 50 mL deionized water, add 2 mol / L KOH solution to adjust the pH to 9-10, and mix well; measure 0.527 mL HAuCl 4 Solution (gold mass concentration is 19.12g Au / L) and 0.2746 mL Co(NO 3 ) 2 solution (c=2.722 mol / L), mix thoroughly; after mixing the above solution, stir for 2 h, then age for 1 h; filter the above solution, and wash with water until there is no chloride ion in the filtrate, and then put the filter cake at 70 o C dried overnight and finally with ...

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Abstract

The invention discloses a high-dispersion nano-gold catalyst with high activity and good stability and a preparation method thereof. The catalyst is a supported nano-gold catalyst mainly but not limited to CO oxidation, which is rich in hydroxyl groups, highly dispersed gold, and has both activity and stability. The present invention is to MO x Carry out amination pretreatment, with the help of it and M 1 Strong interactions between metal hydroxides form hydroxyl-rich [M 1 o y -M 1 (OH) z ] / MO x At the same time, the rich amino groups and hydroxyl groups on the surface of the carrier can disperse and stabilize the Au nanoparticles deposited on the surface of the carrier, so that Au and M can be realized by impregnation or deposition. 1 Salt solution co-deposition onto aminated MO x on the carrier, and the final Au / [M 1 o y -M 1 (OH) z ] / MO x catalyst. The Au / [M 1 o y -M 1 (OH) z ] / MO x The gold catalyst has the characteristics of simple preparation process, easy large-scale production, high dispersion of active components, etc., and has extremely high catalytic activity for CO oxidation reaction and excellent reaction stability.

Description

technical field [0001] The present invention relates to a method for preparing a gold catalyst rich in hydroxyl, highly dispersed gold, having both activity and stability and its catalytic application, specifically a method for preparing a catalyst using an aminated carrier to support nano-Au particles. And the application of this novel catalyst in CO oxidation. Background technique [0002] With the increasing number of high-rise buildings and entertainment facilities, our awareness of safety protection is also increasing, so it is urgent to develop a fast and convenient CO elimination catalyst. The commercially available catalysts for CO gas masks are mainly Hopcalite catalysts, which are based on CuO-MnO x Composite oxide catalyst as the main component. This catalyst has already been used in World War I. However, the catalytic activity of the catalyst, especially the low-temperature catalytic activity, is not high enough, and the anti-water vapor performance is poor, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/66B01J23/89B01J27/24B82Y30/00B82Y40/00B01D53/86B01D53/62
CPCB01J23/66B01J23/8906B01J23/8913B01J23/892B01J27/24B82Y30/00B82Y40/00B01D53/864
Inventor 林清泉房强齐世学邹旭华霍国栋杨文强覃瑜邱智鑫
Owner YANTAI UNIV
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