Method for controllably loading precious metal nanometer material on multi-walled carbon nanotube

A technology of multi-walled carbon nanotubes and nanomaterials, applied in the field of controllable loading of ultra-small precious metal nanomaterials on the surface of multi-walled carbon nanotubes, can solve the problems of loss of catalytic activity and catalyst reduction, and achieve high catalytic activity and good stability , The preparation method is simple and easy to implement

Active Publication Date: 2019-03-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest problem with nanoparticles as catalysts is that their high surface energy can easily cause aggregation or fusion between monomers, resulting in the reduction or loss of catalytic activity of the catalyst.

Method used

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  • Method for controllably loading precious metal nanometer material on multi-walled carbon nanotube
  • Method for controllably loading precious metal nanometer material on multi-walled carbon nanotube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.

[0029] Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedl...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.

[0036]Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedly...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Multi-walled carbon nanotubes were prepared by catalytic assisted CVD. Fe-Mo / MgO is selected as the catalyst, and carbon dioxide is transported into a tube-type high-temperature furnace by using argon-hydrogen mixed gas, and heated at 1000°C for 30 minutes to obtain multi-walled carbon nanotubes.

[0041] Weigh 1 mmol of the prepared multi-walled carbon nanotubes and disperse them into 50 mL of 2 mol / L HCl, and then ultrasonicate (600 W) for 2 hours to remove catalyst particles. The acid-treated carbon nanotubes were rinsed repeatedly with deionized water until neutral to remove chloride ions, and then vacuum-dried at 50° C. for 6 hours to obtain purified multi-walled carbon nanotubes. Disperse the purified multi-walled carbon nanotubes in a mixture of 60ml of concentrated nitric acid and concentrated sulfuric acid (1:2), ultrasonically treat for 18h, filter, wash with deionized water and absolute ethanol repeatedl...

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Abstract

The invention provides a method for controllably loading a precious metal nanometer material on a multi-walled carbon nanotube. The method comprises the following steps: dispersing the multi-walled carbon nanotube into hydrochloric acid, ultrasonically treating, centrifuging, and washing with water till being neutral, thereby acquiring a purified multi-walled carbon nanotube, and then vacuum-drying; dispersing the purified multi-walled carbon nanotube into a mixture of concentrated nitric acid and concentrated sulfuric acid, ultrasonically treating, centrifuging, and washing till being neutral, thereby acquiring a functionalized multi-walled carbon nanotube, and then vacuum-drying; dispersing the functionalized multi-walled carbon nanotube into deionized water, thereby acquiring a dispersion liquid; using an alkaline solution for adjusting pH of dispersion liquid, adding precious metal chemical complex and organic long-chain alcohol and stirring, thereby acquiring mixed liquid; puttingthe mixed liquid into a polytetrafluoroethylene lining reaction kettle, sealing and performing hydro-thermal treatment; centrifuging solid products, washing and vacuum-drying, thereby acquiring a precious metal / multi-walled carbon nanotube composite nanomaterial. The method provided by the invention has controllable experiment conditions and high repeatability and is expected to realize industrial application.

Description

technical field [0001] The invention belongs to the field of functionalized composite nanomaterials, in particular to a general method for controllably loading ultra-small precious metal nanomaterials on the surface of multi-walled carbon nanotubes. Background technique [0002] In today's society, catalytic technology is one of the high and new technologies, and it is also a technology that can generate huge economic and social benefits. 20% to 30% of the gross output value of the national economy in developed countries comes directly from catalysts and catalytic reactions. More than 85% of the reactions in the production process of chemical products are carried out under the action of catalysts. Therefore, the research on people's catalysts is an enduring research direction. At present, many high-efficiency catalysts have been developed for different chemical catalytic reactions. Among them, almost all noble metals can be used as catalysts, and silver, platinum, rutheniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J37/10B01J37/16
CPCB01J23/42B01J23/44B01J23/50B01J35/0013B01J35/0033B01J35/0093B01J37/10B01J37/16
Inventor 管美丽巩学忠张璇李华明
Owner JIANGSU UNIV
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