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Au@Rh nano particle supported catalyst with core-shell structure and preparation method of Au@Rh nano particle supported catalyst

A nanoparticle and catalyst technology, applied in the field of nanocatalysts, achieves the effects of uniform particle size, cost reduction, and easy control of reaction conditions

Active Publication Date: 2014-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports on AuRh / Y supported catalysts prepared from AuRh nanoparticles with core-shell structure and their three-way catalytic activity.

Method used

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  • Au@Rh nano particle supported catalyst with core-shell structure and preparation method of Au@Rh nano particle supported catalyst
  • Au@Rh nano particle supported catalyst with core-shell structure and preparation method of Au@Rh nano particle supported catalyst
  • Au@Rh nano particle supported catalyst with core-shell structure and preparation method of Au@Rh nano particle supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of Gold Nanospheres

[0027] 1.5ml 0.01M HAuCl 4 Add the aqueous solution to 30ml of 0.1M sodium citrate aqueous solution, adjust the total volume of the solution to 61.5ml, and mix well. Add 1.8ml of 0.1M NaBH cooled in an ice-water bath at one time 4 Aqueous solution, the solution immediately turns pink, stirred in a water bath at 25°C for 2-4 hours. Add 4.5ml of 0.01M HAuCl4 aqueous solution to 144ml of 0.1M CTAB aqueous solution, adjust the total volume of the solution to 180ml, add 1.2ml of 0.1M freshly prepared ascorbic acid aqueous solution, mix well, the solution becomes colorless, add the above gold seed solution, After stirring in a water bath at 25°C for 10 min, the solution changed from colorless to wine red.

[0028] 2. Preparation of AuRh nanoparticles

[0029] Centrifuge the above gold nanosphere solution at 24000r / h for 30min, remove the supernatant, redisperse in 5ml of high-purity water, and add 6ml of 0.002M RhCl in turn 3Aqueous s...

Embodiment 2

[0033] 1. Preparation of Gold Nanospheres

[0034] Ditto.

[0035] 2. Preparation of AuRh nanoparticles

[0036] Centrifuge the above gold nanosphere solution at 24000r / h for 30min, remove the supernatant, redisperse in 5ml of high-purity water, add 15ml of 0.002M RhCl 3 Aqueous solution, 50ml0.1M CTAB aqueous solution, 20ml0.2M freshly prepared ascorbic acid aqueous solution, adjust the total volume of the solution to be 90ml, the mixed solution of gold nanospheres, water-soluble Rh salt, protective agent, and newly prepared reducing agent in the solution The molar ratio in the solution was 2:1:5:4, stirred in an oil bath at 140°C for 40 minutes, the solution changed from wine red to brownish black, and AuRh nanoparticles with a molar ratio of Au:Rh of 2:1 were obtained.

[0037] 3. AuRh / γ-Al 2 o 3 Catalyst preparation

[0038] Centrifuge the above AuRh nanoparticle solution at 24000r / h for 30min, remove the supernatant, redisperse in 10ml of high-purity water, ultrasoni...

Embodiment 3

[0040] 1. Preparation of Gold Nanospheres

[0041] Ditto.

[0042] 2. Preparation of AuRh nanoparticles

[0043] Centrifuge the above gold nanosphere solution at 24000r / h for 30min, remove the supernatant, redisperse in 5ml of high-purity water, add 30ml of 0.002M RhCl in turn 3 Aqueous solution, 35ml of 0.1M CTAB aqueous solution, 20ml of 0.2M freshly prepared ascorbic acid aqueous solution, adjusting the total volume of the solution to 90ml, the mixed solution of gold nanospheres, water-soluble Rh salt, protective agent, and newly prepared reducing agent in the solution The molar ratio in the solution was 1:1:3.5:4. Stirred in an oil bath at 140°C for 40 minutes, the solution changed from wine red to brownish black, and AuRh nanoparticles with a molar ratio of Au:Rh of 1:1 were obtained.

[0044] 3. AuRh / γ-Al 2 o 3 Catalyst preparation

[0045] Centrifuge the above AuRh nanoparticle solution at 24000r / h for 30min, remove the supernatant, redisperse in 10ml of high-purit...

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Abstract

The invention discloses an Au@Rh nano particle supported catalyst with a core-shell structure and a preparation method of the Au@Rh nano particle supported catalyst, and belongs to the technical field of nano-catalysts. An Au@Rh nano particle adopting a spherical shape or an urchin-like sphere shape is supported on a carrier Y, the Au@Rh nano particle adopts the core-shell structure, the core is Au, and the shell is Rh. Firstly, a gold nanoball is prepared with a seed growing method, then, the Au@Rh nano particle is prepared with a continuous reduction method, and finally, the Au@Rh / Y catalyst is prepared with an equivalent-volume impregnation method. The preparation process is simple, the reaction condition is easy to control, the shape of a product is single, the granularity is uniform, the yield is high, and the prepared Au@Rh / Y catalyst has excellent catalytic activity on a CO oxidation reaction.

Description

technical field [0001] The invention relates to a method for preparing an AuRh / Y loaded catalyst starting from AuRh nanoparticles with a core-shell structure, and belongs to the technical field of nanometer catalysts. Background technique [0002] The development of industry is like a double-edged sword. While improving and facilitating people's lives, it also brings many negative effects. Among them, more and more environmental pollution affects people's life and work. With the blowout growth of automobile ownership, automobile exhaust is currently the main source of mobile pollution, of which CO, NO X , HC is the main pollutant of automobile exhaust, which seriously affects the quality of atmospheric environment and people's life. At present, the vehicle exhaust emission control technology uses three-way catalytic converters to convert CO, NO X , HC and other pollutants are harmless to achieve the purpose of pollutant discharge control. In the three-way catalytic conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/02B01D53/94B01D53/62B01J35/00
CPCY02A50/20
Inventor 何洪焦娇刘晓军张桂臻宋丽云房玉娇晁晶迪
Owner BEIJING UNIV OF TECH
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