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Catalyst for preparing carbon nanotube and its prepn

A technology of carbon nanotubes and catalysts, applied in the field of catalysts and their preparation, can solve the problems of wide distribution of carbon nanotube diameters, failure to meet the requirements of practical applications, troublesome purification process of carbon nanotubes, etc.

Inactive Publication Date: 2004-11-24
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, while the diameter distribution of carbon nanotubes is wide and the yield is low, the purification process of carbon nanotubes is also troublesome.
Therefore, this catalyst in the traditional form can not meet the requirements of practical application.

Method used

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  • Catalyst for preparing carbon nanotube and its prepn
  • Catalyst for preparing carbon nanotube and its prepn
  • Catalyst for preparing carbon nanotube and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 5.00gLa(NO 3 ) 3 ·6H 2 O, 0.81gFe(NO 3 ) 3 9H 2 O, 2.33gNi(NO 3 ) 2 ·6H 2 O, dissolve it with distilled water, then add 4.60g citric acid. Heat the above solution at 80°C with constant stirring until it evaporates to dryness to obtain a yellow jelly, then carbonize the jelly at 400°C, and finally burn it in a muffle furnace at 800°C and air atmosphere After 4 hours, a black powder was obtained. After grinding the resulting black powder to a size of 60 mesh, the catalyst LaFe 0.2 Ni 0.8 o 3 .

[0036] Will contain 20mg LaFe 0.2 Ni 0.8 o y After putting the quartz boat into the quartz tube, pass N 2 side heat up. When the temperature rises to 700°C, pass H 2 (40ml / min) reduction for half an hour, then change to H 2 (50ml / min), N 2 (140ml / min), C 2 h 2 (16ml / min) mixed gas. After the reaction was carried out for 1 hour, the reaction was stopped, and the product was collected, purified, and dried to obtain 200 mg of carbon nanotubes. The produc...

Embodiment 2

[0038] The same catalyst as in Example 1 was used. Will be loaded with 20mgLaFe 0.2 Ni 0.8 o 3 After putting the quartz boat into the quartz tube, pass N 2 side heat up. When the temperature rises to 700°C, pass H 2 (40ml / min) reduction for half an hour, then change to H 2 (50ml / min) and CH 4 (50ml / min) mixed gas. When the reaction was carried out for 1 hour, the reaction was stopped, and the product was collected, purified, and dried to obtain 160 mg of carbon nanotubes. The yield of the carbon nanotube prepared by the catalyst is 8g / g.catal., and the outer diameter of the carbon nanotube is 5-10nm. The transmission electron micrograph of gained carbon nanotube product is as figure 2 shown.

Embodiment 3

[0040] Weigh 5.0gLa(NO 3 ) 3 ·6H 2 O, 0.2gFe(NO 3 ) 3 9H 2 O, 2.76gNi(NO 3 ) 2 ·6H 2 O, dissolve it with distilled water, then add 4.6g citric acid. Heat the above solution at 80°C with constant stirring until it evaporates to dryness to obtain a yellow jelly, then carbonize the jelly at 400°C for half an hour, and finally in a muffle furnace at 800°C with oxygen (40ml / min) under an atmosphere of burning for 4 hours to obtain a black powder. After grinding the resulting black powder to a size of 60 mesh, the catalyst LaFe 0.05 Ni 0.95 o 3 .

[0041] The preparation conditions of carbon nanotubes are the same as in Example 1. The yield of the carbon nanotube prepared by the catalyst is 10g / g.catal., and the outer diameter of the carbon nanotube is 30-50nm. The transmission electron micrograph of gained carbon nanotube product is as image 3 shown.

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Abstract

The catalyst for preparing carbon nanotube has perovskite or perovskite-like structure. Under heating condition, the catalyst is reduced with hydrogen to produce hydroxide of RE or alkali earth element. During its preparation, salt or oxide of corresponding element is used as main material, and one or several of citric acid, tartaric acid, glycin and EDTA is used as complexing agent and burning agent to prepare the catalyst via gel burning synthesis process in water or ethanol solution. If necessary, ammonia or ammonium compound as pore creating agent may be added in the preparation process to increase the specific surface area of the catalyst. The catalyst makes the prepared carbon nanotube possess even homogeneous tube diameter and even high yield.

Description

technical field [0001] The invention relates to a catalyst for preparing carbon nanotubes and a preparation method thereof, specifically a catalyst with a perovskite or perovskite-like structure, and a preparation method thereof. Background technique [0002] Carbon nanotube is a nano-carbon material with excellent performance, which has a bright application prospect in microelectronics, composite materials, catalysis and other fields. A large number of studies have shown that: the diameter of carbon nanotubes and the size of the helix angle are two main factors that determine the properties of carbon nanotubes. Therefore, whether it is the research on the properties of carbon nanotubes or the practical application of carbon nanotubes, it is required that the carbon nanotubes have a relatively uniform diameter. At the same time, the key factor determining the cost of carbon nanotubes is the yield of carbon nanotubes relative to the catalyst, which is also one of the key fac...

Claims

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Application Information

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IPC IPC(8): B01J23/83C01B31/02
Inventor 瞿美臻唐长兴周固民张伯兰于作龙
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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