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A method for self-recycling of carbon nanotube catalysts

A carbon nanotube and catalyst technology, applied in the field of carbon nanotube catalyst self-recycling, can solve problems such as pollution, material waste and environment, and achieve the effect of reducing waste liquid discharge and avoiding losses

Active Publication Date: 2017-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of material waste and potential environmental pollution caused by the waste liquid containing catalyst elements produced in the purification process of continuous production of carbon nanotubes, and to realize the green, high-efficiency macro-production of carbon nanotubes through the method of self-cycling of catalysts. volume preparation

Method used

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Examples

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Embodiment 1

[0029] Fe is used as a catalyst active component, magnesium oxide is used as a catalyst carrier, and carbon nanotubes are prepared by chemical vapor deposition. Take 20kg and place it in a stirred tank, add 600L of 10% sulfuric acid solution by mass fraction, and process it under stirring for 12 hours, and the reaction temperature is maintained at 80°C. Separate by filtration to collect solid and liquid respectively. The solid is repeatedly rinsed, dried, and weakly oxidized to obtain a carbon nanotube product, which is packaged and preserved. The liquid is transported to the stirring tank of the catalyst recovery device, where 1 kg of ethylenediaminetetraacetic acid disodium salt is added to complex the iron ions in the solution, and 400 L of 2 mol / L ammonium carbonate solution is added to adjust the pH of the mixed solution to 8.5, and then The liquid-phase co-precipitation reaction was carried out at room temperature, and the reaction time was 2 hours. Liquid-solid separa...

Embodiment 2

[0031] Co is used as the catalyst active component, magnesium oxide is used as the catalyst carrier, and carbon nanotubes are prepared by chemical vapor deposition. Take 2 kg and place it in a stirred tank, add 30 L of sulfuric acid solution with a mass fraction of 20%, and process it under stirring for 2 hours, and the reaction temperature is maintained at 90°C. Separate by filtration to collect solid and liquid respectively. The solid is repeatedly rinsed, dried, and vacuumed at high temperature to obtain carbon nanotube products, which are packaged and preserved. The liquid is transported to the stirring tank of the catalyst recovery device, where 0.2kg of ethylenediaminetetraacetic acid disodium salt is added to complex the metal ions in the solution, and 8L of 10mol / L sodium hydroxide solution is added to adjust the pH of the mixed solution to 8.5 , carry out liquid-phase co-precipitation reaction at room temperature, and the reaction time is 6 hours. Liquid-solid separ...

Embodiment 3

[0033] Ni is used as a catalyst active component, magnesium oxide is used as a catalyst carrier, and carbon nanotubes are prepared by a chemical vapor deposition method. Take 200kg and place it in a stirred tank, add 1000L of nitric acid solution with a mass fraction of 40%, and process it under stirring for 24 hours, and the reaction temperature is maintained at 50°C. The solid and liquid were collected separately by centrifugation. The solid is repeatedly rinsed, dried, and weakly oxidized to obtain a carbon nanotube product, which is packaged and preserved. The liquid is transported to the stirring tank of the catalyst recovery device, where 2kg of ethylenediaminetetraacetic acid disodium salt is added to complex the metal ions in the solution, sodium carbonate solid is added, the pH of the mixed solution is adjusted to 8.5, and the liquid is carried out at room temperature. Phase co-precipitation reaction, the reaction time is 6 hours. Liquid-solid separation is carried ...

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Abstract

The invention discloses a self-recycling method for a carbon nanotube catalyst, which belongs to the technical field of preparation of new materials. The method of the invention adopts a catalyst containing a transition metal and a magnesium oxide carrier to grow carbon nanotubes, and obtains a solid-phase carbon nanotube product and a liquid containing catalyst components through chemical purification; adopts disodium salt of ethylenediaminetetraacetic acid and alkaline substances The catalyst is recycled and regenerated, and the self-circulating carbon nanotube catalyst is used for the green cyclic growth of the carbon nanotube. The catalyst self-circulation regeneration method provided by the invention avoids the discharge of waste liquid containing catalyst elements and the potential environmental pollution caused by the carbon nanotube purification process, and provides a new green method for preparing carbon nanotubes in large quantities.

Description

technical field [0001] The invention belongs to the technical field of novel material preparation, and in particular relates to a method for self-recycling of carbon nanotube catalysts. Background technique [0002] The rapid development of nanoscience and technology has not only opened up new horizons for us to better understand nature, but also brought us multifunctional and diverse nanomaterials that are urgently needed for the sustainable development of society in the future. Carbon nanotubes are one of the most important advanced materials. Its excellent intrinsic properties make it have broad application prospects in many fields, such as transparent conductive films, fillers for nanocomposites, electrode materials for energy storage, and so on. To realize these application possibilities better and more extensively, the controllable macro-fabrication of carbon nanotubes is a prerequisite. [0003] Generally speaking, compared with arc discharge method and laser etchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/16C01B32/168B01J38/00
CPCY02P20/584
Inventor 张强陈天驰张睿魏飞
Owner TSINGHUA UNIV
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