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Catalyst for preparing carbon nanotubes as well as preparation method and application thereof

A catalyst and template technology, applied in the field of carbon nanomaterials, can solve the problems of low catalyst production efficiency, long time consumption, difficulty in adopting a fluidized operation process with high space velocity, etc., and achieve the effect of improving industrial production efficiency and increasing growth rate.

Inactive Publication Date: 2021-08-06
佛山市格瑞芬新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The co-precipitation method produces a large amount of waste water in the process of preparing the catalyst, resulting in high environmental protection costs; on the other hand, in order to ensure the loose accumulation of primary particles, freeze-drying must be used. This process takes a long time and the catalyst production efficiency is low, which limits this method. industrial application of
[0006] 2) The amount of waste water produced by the spray pyrolysis method is less than 10% of that of the co-precipitation method when the catalyst is prepared, but the preparation process needs to adopt complex spray pyrolysis equipment, strictly control the size of the micro-droplets, and the production cost is high; in addition , the apparent density of the catalyst is less than 0.1g / cm 3 , it is difficult to adopt a fluidized operation process with a high space velocity, which limits the efficiency of a single reactor for growing carbon nanotubes

Method used

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  • Catalyst for preparing carbon nanotubes as well as preparation method and application thereof
  • Catalyst for preparing carbon nanotubes as well as preparation method and application thereof
  • Catalyst for preparing carbon nanotubes as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] This example provides a kind of preparation method of catalyst, and the steps are as follows:

[0096] Step 1: Dissolve ferric nitrate nonahydrate and cobalt nitrate hexahydrate (the total molar mass of the two is 0.5mol), 1.5mol magnesium nitrate hexahydrate, 1.5mol aluminum nitrate nonahydrate and ethylenediaminetetraacetic acid in water at 50°C Stir and dissolve at ~60°C, then keep stirring for 1 hour to form a metal-organic complex.

[0097] Step 2: Add 0.22mol flake Al(OH) to the solution in Step 1 3 , and stirred at 50°C to 60°C for 2h.

[0098] Step 3: Add guar gum thickener to the dispersion in step 2, and continue to stir at 50° C. to 60° C. for 2 hours to obtain a precursor dispersion with a viscosity (25° C.) of about 4000 mPa·s.

[0099] Step 4: Put the precursor dispersion liquid in a high-temperature furnace at 450°C for calcination, and then crush it into 50-200 mesh to obtain the catalyst of this example.

Embodiment 2

[0101] This example provides a kind of preparation method of catalyst, and the steps are as follows:

[0102] Step 1: Ferric nitrate nonahydrate and cobalt nitrate hexahydrate (the total molar mass of both is 0.5mol), 1.0mol magnesium nitrate hexahydrate, 1.3mol aluminum nitrate nonahydrate and citric acid are dissolved in water at 60°C to 70°C Stir and dissolve at high temperature, and then keep stirring for 1 hour to form a metal-organic complex.

[0103] Step 2: Add 1.4 mol of flake Mg(OH) to the solution in Step 1 2 , and stirred at 60°C to 70°C for 2h.

[0104] Step 3: Add guar gum thickener to the dispersion in step 2, and continue to stir at 60°C to 70°C for 2h to obtain a precursor dispersion with a viscosity (25°C) of about 2000mPa·s.

[0105] Step 4: Put the precursor dispersion in a high-temperature furnace at 500°C for calcination, and then crush it into 50-200 mesh to obtain the catalyst of this example.

Embodiment 3

[0107] This example provides a kind of preparation method of catalyst, and the steps are as follows:

[0108] Step 1: Ferric nitrate nonahydrate and cobalt nitrate hexahydrate (the total molar mass of the two is 0.5mol), 0.8mol magnesium nitrate hexahydrate, 0.8mol aluminum nitrate nonahydrate and polyacrylic acid are dissolved in water at 70°C to 80°C Stir and dissolve at high temperature, and then keep stirring for 1 hour to form a metal organic ligand complex.

[0109] Step 2: Add flake aluminum-magnesium hydrotalcite carrier (the molar number of Mg and Al is 2.1 mol) to the solution in step 1, and stir at 50° C. to 80° C. for 2 hours.

[0110] Step 3: Add guar gum thickener to the dispersion in step 2, and continue to stir at 70° C. to 80° C. for 2 hours to obtain a precursor dispersion with a viscosity (25° C.) of about 20,000 mPa·s.

[0111] Step 4: Put the precursor dispersion in a high-temperature furnace at 500°C for calcination, and then crush it into 50-200 mesh to...

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Abstract

The invention discloses a catalyst for preparing carbon nanotubes as well as a preparation method and application thereof. The catalyst comprises a porous sheet-shaped carrier and an active component dispersed on the porous sheet-shaped carrier, wherein the active component comprises a transition metal element. The porous sheet-shaped catalyst provided by the invention is suitable for preparing carbon nanotubes, can meet the preparation requirements of few-wall array carbon nanotubes, can improve the growth rate of carbon nanotubes and improve the industrial production efficiency, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a catalyst for preparing carbon nanotubes, a preparation method and application thereof. Background technique [0002] Multi-walled carbon nanotubes have two microscopic shapes: agglomerates and oriented arrays. Compared with agglomerated carbon nanotubes, in the array carbon nanotubes, all carbon nanotubes have a larger aspect ratio and a more consistent orientation, which is conducive to maintaining a larger aspect ratio during the dispersion process, better play its conductive properties. Since the oligowall array carbon nanotubes with a wall number less than 7 have better electrical conductivity and lower dosage, they are more and more favored by the industry, but limited by the catalyst technology, the array carbon nanotubes that can be mass-produced currently The number of walls is large (the number of walls is greater than 6, and the specific surface area is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J37/08C01B32/162
CPCB01J23/78B01J37/0009B01J37/086C01B2202/04C01B2202/32C01B32/162
Inventor 周平沈跃成张翼王昆明
Owner 佛山市格瑞芬新能源有限公司
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