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CNT (carbon nano tube)-gold and copper alloy composite material as well as preparation method and application thereof

A technology of carbon nanotubes and gold-copper alloys, applied in chemical instruments and methods, oxidation preparation of carbonyl compounds, metal/metal oxide/metal hydroxide catalysts, etc. Catalytic effect is not good and other problems, to achieve the effect of improving anti-sintering performance, increasing the effect of metal ions, and reducing the phenomenon of agglomeration

Active Publication Date: 2019-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gold-copper alloy is an alloy made of high-purity gold and copper. Traditional gold-copper alloy materials have weak adsorption capacity, and the effect of using them alone is not good. The specific surface area is small, easy to agglomerate and poor sintering resistance.
[0003] At present, the preparation methods of gold-copper alloy mainly include template method, impregnation method, and explosion method. There are problems such as complex preparation method, high cost, single particle size, serious particle agglomeration during alloying, and the active surface area caused by the growth of metal particles during the alloying process. The loss of the supported catalyst is the main reason for the deactivation of the supported catalyst; at the same time, in the heterogeneous catalysis, the catalytic process mainly occurs on the surface of the catalyst, and the reactants have poor adsorption capacity on the surface of the gold-copper alloy, resulting in poor catalytic effect.

Method used

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  • CNT (carbon nano tube)-gold and copper alloy composite material as well as preparation method and application thereof
  • CNT (carbon nano tube)-gold and copper alloy composite material as well as preparation method and application thereof
  • CNT (carbon nano tube)-gold and copper alloy composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A kind of preparation method of carbon nanotube-gold-copper alloy composite material of the present invention comprises the following steps:

[0036](1) Acid treatment: using multi-walled carbon nanotubes as the matrix, the CNTs are about 500nm long and 20-25nm wide, put the CNTs into a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1) and heat at 110°C for 2h , washed with a large amount of deionized water to obtain acid-treated CNTs, the concentration of CNTs is 5g / l, and the transmission electron microscope picture is as follows figure 1 shown;

[0037] (2) Gold plating on the surface: Add 8ml of the acid-treated CNTs obtained in step (1) into 16ml of 1mol / L PEI, stir at room temperature for 30min, use a supervibrator to supervibrate for 5min at frequencies of 60HZ and 40HZ, and mix evenly Finally, add 6ml of chloroauric acid, put it in a water bath furnace and stir and heat for 1h, take out the CNTs, filter and clean them to obta...

Embodiment 2

[0047] A kind of preparation method of carbon nanotube-gold-copper alloy composite material of the present invention comprises the following steps:

[0048] (1) Acid treatment: using multi-walled carbon nanotubes as the matrix, the CNTs are about 500nm long and 20-25nm wide, put the CNTs into a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 2:1) and heat at 90°C for 2h , washed with a large amount of deionized water to obtain acid-treated CNTs, the concentration of CNTs is 5g / l;

[0049] (2) Gold plating on the surface: Add 8ml of the acid-treated CNTs obtained in step (1) into 16ml of 1mol / L PEI, stir at room temperature for 30min, use a supervibrator to supervibrate for 5min at frequencies of 60HZ and 40HZ, and mix evenly Finally, add 12ml of chloroauric acid, put it in a water bath furnace, stir and heat for 1.5h, take out the CNTs, filter and clean them to obtain gold-plated CNTs;

[0050] (3) Copper plating on the surface: Add the gold-p...

Embodiment 3

[0059] A kind of preparation method of carbon nanotube-gold-copper alloy composite material of the present invention comprises the following steps:

[0060] (1) Acid treatment: using multi-walled carbon nanotubes as the matrix, the CNTs are about 500nm long and 20-25nm wide, put the CNTs into a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1) and heat at 90°C for 2h , washed with a large amount of deionized water to obtain acid-treated CNTs, the concentration of CNTs is 5g / l;

[0061] (2) Gold plating on the surface: Add 8ml of the acid-treated CNTs obtained in step (1) into 16ml of 1mol / L PEI, stir at room temperature for 30min, use a supervibrator to supervibrate for 5min at frequencies of 60HZ and 40HZ, and mix evenly Finally, add 4ml of chloroauric acid, put it into a water-bath furnace, stir and heat for 1 hour, take out the CNTs, filter and clean them to obtain gold-plated CNTs;

[0062] (3) Copper plating on the surface: Add the gol...

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Abstract

The invention discloses a CNT (carbon nano tube)-gold and copper alloy composite material. The CNT-gold and copper alloy composite material comprises CNTs and gold and copper alloy nanoparticles on the surface layers, the gold and copper alloy layer is prepared from components in percentage by weight as follows: 5wt%-10wt% of CNTs, 15wt%-65wt% of gold and 25wt%-75wt% of copper. By means of loadingof the CNTs, interaction between gold-copper and carriers can be improved, and sintering resistance of the gold and copper nanoparticles is greatly improved; by means of high specific surface area ofthe CNTs and mutual support structure of nano tubes in a catalyst, the gold and copper nanoparticles are separated and dispersed, distance between the gold and copper nanoparticles is increased, a certain effect on the sintering resistance of the catalyst is realized, and reaction stability of the catalyst is improved; the gold and copper nanoparticles with different grain sizes can be obtained by adjusting technological parameters, are high in purity and wide in particle size range and have controllable grain size, the obtained gold and copper alloy nanoparticles have good interface bondingwith the CNTs, and catalytic performance of the alloy is better than that of a traditional gold and copper alloy.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a carbon nanotube-gold-copper alloy composite material and a preparation method and application thereof. Background technique [0002] With the widespread application of nanoalloys in the field of catalysis, the use of supported gold nanoparticles as catalysts and the combination of gold-containing bimetallic catalysts with other metals have become research hotspots. Gold-copper alloy is an alloy made of high-purity gold and copper. Traditional gold-copper alloy materials have weak adsorption capacity, poor effect when used alone, small specific surface area, easy agglomeration and poor sintering resistance. [0003] At present, the preparation methods of gold-copper alloy mainly include template method, impregnation method, and explosion method. There are problems such as complex preparation method, high cost, single particle size, serious particle agglo...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/02B01J35/10C07C45/29C07C47/06
CPCC07C45/29B01J23/8926B01J35/396B01J35/40B01J35/61C07C47/06
Inventor 龚深李周肖柱王洋吴迪
Owner CENT SOUTH UNIV
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