Method for preparing high fullerene and special anode thereof

A fullerene and anode technology, applied in the preparation method of large fullerene and its special anode field, can solve difficult problems such as yield, achieve low cost, increase yield, simple production and process

Active Publication Date: 2011-10-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past few years, when researchers are studying to increase the yield of fullerenes, they have changed the current intensity, the pressure of the inert gas, the cooling circulation system, the distance between the two electrodes and other conditions, and it is difficult to achieve a substantial increase in the yield.

Method used

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  • Method for preparing high fullerene and special anode thereof
  • Method for preparing high fullerene and special anode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, arc discharge method to prepare large fullerenes - adding condensed aromatic hydrocarbons to the anode as fluorene: phenanthrene = 1: 3 (ratio in molar fractions)

[0022] (1) the diameter is 8mm, the length is that the solid spectrum pure graphite rod of 150mm is drilled into the hollow graphite tube that internal diameter is about 6mm, the mol fraction ratio of fluorene and phenanthrene is 1: 3 mixed ring aromatics and graphite powder The mixture is filled into the above-mentioned hollow graphite tube and compacted, wherein the mass-number ratio of the mixed condensed ring aromatic hydrocarbons of fluorene and phenanthrene to graphite powder is 1:20; the filled graphite rod is installed and fixed on the anode of the electric arc furnace, and closed Furnace cabin: turn on the vacuum pump, open the valve between the furnace cavity and the vacuum pump, and evacuate the electric arc furnace until the air pressure is lower than 10Pa, turn on the cooling circulati...

Embodiment 2

[0026] Example 2, arc discharge method to prepare large fullerenes - adding condensed aromatic hydrocarbons to the anode as fluorene: naphthalene = 3: 4 (ratio in molar fractions)

[0027] (1) The experimental procedure is the same as the step (1) in Example 1, and the difference is: the polycyclic aromatic hydrocarbon is a mixture of fluorene and naphthalene, wherein the molar ratio of fluorene and naphthalene is 3: 4; the electric current of arc discharge is 160A, the voltage is 38V, the pressure of the He atmosphere is 350Torr, and the cathode is graphite electrode;

[0028] (2) experimental procedure is with the step (2) in embodiment 1;

[0029] (3) experimental procedure is the same as step (3) in embodiment 1;

[0030] (4) Taking the peak area obtained by adding simple graphite powder in the hollow graphite rod as a benchmark (other experimental conditions are as above-mentioned steps (1)-(3)), determine the yield change of the corresponding product by the change of th...

Embodiment 3

[0031]Example 3, arc discharge method to prepare large fullerenes - adding fused ring aromatic hydrocarbons to the anode as fluorene: anthracene = 2: 3 (ratio in molar fractions)

[0032] (1) The experimental procedure is the same as the step (1) in Example 1, and the difference is: the condensed aromatic hydrocarbon is a mixture of fluorene and anthracene, wherein the molar ratio of fluorene and anthracene is 2: 3; the electric current of arc discharge is 170A, the voltage is 41V, the pressure of the He atmosphere is 450Torr, and the cathode is a tungsten electrode;

[0033] (2) experimental procedure is with the step (2) in embodiment 1;

[0034] (3) experimental procedure is the same as step (3) in embodiment 1;

[0035] (4) Taking the peak area obtained by adding simple graphite powder in the hollow graphite rod as a benchmark (other experimental conditions are as above-mentioned steps (1)-(3)), determine the yield change of the corresponding product by the change of the ...

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Abstract

The invention discloses a method for preparing high fullerene and a special anode thereof. The anode is prepared according to the following method: filling a mixture of graphite and mixed polycyclic aromatic hydrocarbon into a hollow graphite rod so as to obtain the anode. In the mixture of the graphite and the mixed polycyclic aromatic hydrocarbon, the mass ratio of the graphite with the polycyclic aromatic hydrocarbon is 1:20. The method comprises the following steps: conducting arc discharging on the anode and cathode under the He atmosphere so as to obtain high fullerene which is at least one of C76, C78, C84, C86 and C90. In the invention, a certain proportion of mixed polycyclic aromatic hydrocarbon is added in the graphite, so that the yield of C76 can be improved by 2-3 times, the yield of the C78 and the C84 can be improved by about 4 times, and the yield of the C86 and the C90 is improved by a certain degree.

Description

technical field [0001] The invention relates to a method for preparing large fullerenes and a special anode thereof, in particular to a method for preparing large fullerenes by an arc discharge method and a special anode thereof. Background technique [0002] The properties of most large fullerenes are related to C 60 are similar, of course, some properties are obviously different, such as structure and symmetry, thermodynamic stability, optical properties, aromaticity and so on. Studying the chemistry of large fullerenes is challenging because their reactions often provide numerous and structurally similar products. As the number of atoms increases, the partially isomeric addition products of large fullerenes have chiral structures, which makes their chemical reactions an attractive research area. However with C 60 In contrast, there are relatively few studies on the chemistry of large fullerenes, because except for C 70 The output of other large fullerenes is very limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 王春儒蒋礼吴波舒春英王太山
Owner INST OF CHEM CHINESE ACAD OF SCI
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