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High-efficiency catalyst for growing carbon nanotubes, and preparation method and use method thereof

A carbon nanotube and catalyst technology, applied in the field of high-efficiency catalysts and preparation thereof, can solve the problems of high preparation cost, easy deactivation, low yield and the like of high-quality carbon nanotubes, and achieves a simple and easy preparation process and low cost of raw materials Effect

Pending Publication Date: 2020-10-30
JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of easy deactivation of the catalyst due to Austenitic ripening, high cost of preparation of high-quality carbon nanotubes, and low yield, which is conducive to promoting the large-scale production of high-quality carbon nanotubes

Method used

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  • High-efficiency catalyst for growing carbon nanotubes, and preparation method and use method thereof
  • High-efficiency catalyst for growing carbon nanotubes, and preparation method and use method thereof
  • High-efficiency catalyst for growing carbon nanotubes, and preparation method and use method thereof

Examples

Experimental program
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preparation example Construction

[0028] The present invention is a method for preparing a highly efficient catalyst for growing carbon nanotubes, the catalyst formula comprising:

[0029] 1.5-2.5 parts of cobalt,

[0030] 0.25 to 1 part of iron,

[0031] 0.5-1.5 parts of alumina,

[0032] Dysprosium of 0.05~0.15 parts,

[0033] 0.05-0.15 parts of molybdenum oxide.

[0034] Described high-efficiency catalyst preparation method is carried out as follows:

[0035] S1. Weigh the above-mentioned metal / metal oxide precursor raw materials in molar ratio, and disperse them in deionized water;

[0036] S2. Add complexing agent or alkaline solution to S1 by complexation method or co-precipitation method, fully stir and reflux for 12 hours to make all components evenly mixed;

[0037] S3. If S2 adopts the complexation method, dry the mixed solution slowly at 60-150°C. If S2 adopts the co-precipitation method, age the mixed precipitate at 60-150°C for 12-24 hours, and then wash it repeatedly with water after suction...

Embodiment 1

[0049] Example 1: Experiment of a blank control group without doping rare earth elements.

[0050]s1) Preparation of cobalt-iron-based catalyst: Weigh 2 parts of cobalt nitrate, 0.25 parts of iron nitrate, 1 part of aluminum nitrate, and 0.05 part of ammonium molybdate into deionized water and stir for 30 minutes, then add excess sodium hydroxide solution , stirred and refluxed at 100°C for 12h, aged at 90°C for 12h, and the resulting precipitate was repeatedly washed with water and then dried. The dried product was packed in a quartz boat, first placed in a horizontal tube furnace for calcination at 500°C in air for two hours, and then reduced with hydrogen for 10 minutes under the protection of argon to finally obtain a cobalt-iron-based catalyst.

[0051] s2) Preparation of carbon nanotubes: Weigh 0.1 g of the above-mentioned cobalt-iron-based catalyst and put it in a quartz boat, place it in a horizontal tube furnace, and fill it with argon gas at a standard atmospheric pr...

Embodiment 2

[0052] Example 2: Routine experiments on dysprosium doped catalysts.

[0053] 0.05 part of dysprosium nitrate is added to the raw material in step s1, and the others are the same as above to obtain a dysprosium-doped cobalt-iron-based catalyst. The s2 step is the same as above, and the prepared carbon nanotube scanning characterization is as follows figure 2 As shown, the Raman characterization is as image 3 shown.

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Abstract

The invention belongs to the technical field of preparation processes and application of nano materials, and relates to a high-efficiency catalyst for growing carbon nanotubes, and a preparation method and a use method thereof. The catalyst is composed of cobalt, iron, dysprosium metal, molybdenum oxide and aluminum oxide, and all the components are evenly distributed; due to introduction of dysprosium, aggregation, growth and deactivation caused by Ostwald ripening of the catalyst can be effectively inhibited, and the efficiency of the catalyst for growing the carbon nanotubes is greatly improved. Carbon-containing gas is used as a carbon source, the catalyst is flatly laid in a quartz boat, a chemical vapor deposition reaction is carried out in a horizontal tubular furnace to prepare thecarbon nanotubes, and the yield can reach 6000% or above (the ratio of a post-growth product to a pre-growth catalyst). The dysprosium metal doped catalyst with uniform components can be prepared andused for efficiently growing the carbon nanotubes, the preparation process is simple, convenient and feasible, the cost of the raw materials is low, the purity and graphitization degree of the growncarbon nanotubes are high, and the catalyst has great significance in promoting industrial production and application of high-quality carbon nanotubes.

Description

Technical field: [0001] The invention belongs to the field of nanomaterial preparation technology and application technology, and relates to a high-efficiency catalyst for growing carbon nanotubes and a preparation and use method thereof. Background technique: [0002] Carbon nanomaterials are mainly composed of fullerenes, carbon nanotubes, graphene, etc. Carbon nanotube is a typical one-dimensional nanomaterial. Since Sumio Iijima observed this kind of material with special structure under the transmission electron microscope in 1991, it has been widely concerned and studied deeply. In the past 30 years of research and exploration, the application of carbon nanotubes has gradually penetrated into the fields of electronics, optical instruments, transparent conductive films, and high-performance field-effect transistors. At present, the commercial preparation of carbon nanotubes usually adopts chemical vapor deposition (CVD), and the core technology of this method lies in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C01B32/162
CPCB01J23/002B01J23/8871C01B32/162C01B2202/22
Inventor 阮超陈名海徐乐乐常艺黄海露
Owner JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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