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Method for synthesizing carbon nano tube based on iron-cobalt-aluminum catalyst with layered structure

A layered structure and nanotube technology, applied in the field of chemistry, can solve the problems of difficulty in dispersion and processing, unfavorable carbon nanotube performance, etc., and achieve the effects of easy purification, good electrical conductivity, and low ferromagnetic metal impurity content.

Pending Publication Date: 2022-06-03
无锡东恒新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalysts for synthesizing carbon nanotubes are mainly in the powder state or granular form of disordered accumulation. The synthesized carbon nanotubes are agglomerated and entangled with each other, and the defects are obvious, which is not conducive to the performance of carbon nanotubes, making subsequent dispersion and processing difficult.

Method used

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  • Method for synthesizing carbon nano tube based on iron-cobalt-aluminum catalyst with layered structure
  • Method for synthesizing carbon nano tube based on iron-cobalt-aluminum catalyst with layered structure

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) prepare iron cobalt aluminum catalyst:

[0044] Pretreatment of vermiculite particles: golden yellow flaky vermiculite (produced in Hebei) with a particle size of 3-8mm was heat-treated at 1000 °C for 10 seconds, expanded into small worms, and then immersed in 2mol / L ammonium citrate solution, and subjected to heat treatment at 1000 °C 10 seconds, the secondary fully expanded into a long worm shape; use a hammer crusher to crush the worm-shaped vermiculite into a size of 1-3mm, and use a cyclone to separate and remove the unexpanded vermiculite and metal impurities with a high density. The 15000GS electromagnetic dry powder iron remover removes ferromagnetic particles; then add pure water according to the weight ratio of vermiculite: pure water = 1:5, stir the mixture until it has a certain fluidity, and remove the sediment associated with vermiculite through a 120-mesh screen , to obtain pretreated vermiculite particles;

[0045] Preparation of salt solution: Weig...

Embodiment 2

[0051] (1) prepare iron cobalt aluminum catalyst:

[0052] Pretreated vermiculite particles: the same as in Example 1;

[0053] Preparation of salt solution: Weigh 20.2g of ferric nitrate nonahydrate, 6.4g of cobalt nitrate nonahydrate, and 27g of aluminum nitrate nonahydrate into a 1L beaker, add 400g of pure water, and stir at room temperature for 20min to completely dissolve the nitrate solution. Add 50 g of pretreated vermiculite particles to the beaker, and use a plate paddle to stir and immerse at low speed at room temperature for 10 hours; after the vermiculite is fully immersed in the salt solution and sinks to the bottom,

[0054] To prepare lye solution: Weigh 260 g of 25%wt ammonia water, 6.18 g of ammonium heptamolybdate tetrahydrate, and 184 g of pure water to prepare a dilute aqueous ammonia solution;

[0055] Preparation of catalyst: add 50g of pretreated vermiculite particles to the beaker, and use a plate paddle at room temperature (room temperature 25°C) to ...

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Abstract

The invention discloses a method for synthesizing a carbon nanotube based on an iron-cobalt-aluminum catalyst with a layered structure, and belongs to the technical field of chemistry. According to the method, vermiculite is subjected to expansion treatment, secondary intercalation expansion, crushing, separation and screening, demagnetization and water flotation, then the iron-cobalt-aluminum catalyst is uniformly precipitated and loaded in a reaction kettle, and the obtained catalyst is subjected to secondary crushing, secondary screening and secondary demagnetization to obtain the layered catalyst with low metal impurity content. After the catalyst is reduced, olefin is cracked in stages in a fluidized bed to synthesize the carbon nanotube. The microstructure of the carbon nanotube obtained by the method is in an array shape, the content of ferromagnetic metal impurities is low, the conductivity is good, and the purification treatment is relatively easy.

Description

technical field [0001] The invention relates to a method for synthesizing carbon nanotubes based on a layered structure iron-cobalt-aluminum catalyst, belonging to the technical field of chemistry. Background technique [0002] In recent years, carbon nanotubes have been widely used in the new energy vehicle lithium battery industry as an excellent conductive agent. Because of its ultra-high aspect ratio and high conductivity, compared with traditional conductive agents such as graphite and superP, a small amount of addition can form an efficient three-dimensional conductive network structure in the electrode. Key indicators such as battery energy density and service life. Therefore, it has become a trend to synthesize new carbon nanotube conductive agents to replace traditional conductive agents. [0003] In the synthesis process of carbon nanotubes, catalysts are indispensable, and their structure and morphology affect the structure and properties of carbon nanotubes. A...

Claims

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Application Information

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IPC IPC(8): C01B32/162B01J23/75B01J23/882B01J35/02B82Y30/00B82Y40/00H01M4/62H01M10/052
CPCC01B32/162B01J23/75B01J23/882H01M4/625H01M10/052B82Y30/00B82Y40/00C01P2004/04B01J35/33B01J35/00B01J35/30Y02E60/10
Inventor 沈宇栋蔡小锋
Owner 无锡东恒新能源科技有限公司
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