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Device and method for preparing single-walled carbon nanotubes through extensible floating catalytic cracking

A single-walled carbon nanotube, floating catalytic cracking technology, applied in the fields of carbon nanotubes, chemical instruments and methods, nanocarbons, etc., can solve the problem of difficult to break through the daily production capacity of kilogram-scale single-walled carbon nanotubes, and uncontrollable product collection continuity. and other problems to achieve the effect of maintaining uniformity and reducing load

Active Publication Date: 2022-03-11
JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The size factor of the reactor is also restricting the production capacity of single-walled carbon nanotubes prepared by floating catalytic chemical vapor deposition. Reaction efficiency, improve reaction capacity; use a single vertical reaction pipe with a single 0.5-liter reaction chamber (the inner diameter of the furnace tube is 50 mm, and the length of the reaction zone is 250 mm), and its production capacity is 1.1 grams per hour; use ten 0.5-liter reaction tubes The chamber’s vertical reaction pipes (inner diameter of the furnace tube is 50 mm, and the length of the reaction zone is 250 mm) are arranged in an array, and its production capacity is 11 grams per hour. It is still difficult to break through the production capacity of kilogram-level single-walled carbon nanotubes per day, and the product collection is continuous sex uncontrollable

Method used

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  • Device and method for preparing single-walled carbon nanotubes through extensible floating catalytic cracking
  • Device and method for preparing single-walled carbon nanotubes through extensible floating catalytic cracking
  • Device and method for preparing single-walled carbon nanotubes through extensible floating catalytic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The carrier gas was preheated to 280 °C to open the catalyst pretreatment unit, and the temperature of the product synthesis unit was raised to 900 °C; then, ferrocene was injected into the catalyst pretreatment unit with a total volume of 0.5L through the powder feeder, and the catalyst auxiliary thiophene was injected at the same time. The preheated carrier gas is mixed with catalyst and catalyst assistant and sent to the catalyst pretreatment unit, wherein the iron / sulfur molar ratio in the catalyst and catalyst assistant is controlled to be 1:8. The carbon source mixed gas is introduced into the reaction chamber with a volume of 25L to carry out the synthesis reaction. The generated product enters the product collection unit with the gas through the connecting pipeline, and the final product is obtained by filtration and separation.

[0083] The carbon source mixed gas comprises carbon source gas 10% methane, the reducing gas volume is 32% hydrogen and 2% water vapor...

Embodiment 2

[0087] The difference between the device and the process method in Example 1 is that the carrier gas is preheated to 400°C, and the product synthesis unit is heated to 1170°C;

[0088] The total volume of the catalyst pretreatment unit is 8L, and the volume of the reaction chamber is 400L;

[0089] The product collection unit obtains the final product by moving the scraper.

[0090] The carbon source mixed gas comprises carbon source gas 12% methane, reducing gas 35% hydrogen and 5% carbon monoxide mixed gas, water vapor is 3%, and the rest is nitrogen inert gas. The carbon source mixture is preheated to 430°C.

[0091] The included angle of the accelerating monomers of the catalyst pretreatment unit adopts three sets of equal ratios of 1:2:3 combined accelerating units to be nested in a non-closed conical structure, the included angles are 5, 10, and 15 degrees respectively, and the distance is 15mm. Using tungsten high temperature resistant material, the gas velocity at t...

Embodiment 3

[0094] The difference between the device and the process method of Example 2 is that the carrier gas is preheated to 660°C and the product synthesis unit is heated to 1370°C;

[0095] The total volume of the catalyst pretreatment unit is 18L, and the volume of the reaction chamber is 2000L;

[0096] Described iron / sulfur ratio is controlled to be 1:5;

[0097] The collection unit obtains the final product by means of cyclone separation.

[0098] The carbon source mixed gas comprises carbon source gas 15% methane, reducing gas 50% hydrogen, water vapor 5%, and the rest is nitrogen inert gas. The carbon source mixture is preheated to 480°C.

[0099] The included angle of the accelerating monomers of the catalyst pretreatment unit adopts 6 groups of equal ratios of 1:2:3 combined accelerating units to be nested in a non-closed conical structure, the included angles are 10, 20, and 30 degrees respectively, and the distance is 45mm. Using graphite high temperature resistant mat...

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Abstract

The invention belongs to the technical field of nano material preparation, and relates to a device and a method for preparing a single-walled carbon nanotube through extensible floating catalytic cracking. The device comprises a powder feeder, a product synthesis unit and a product collection unit, and further comprises a catalyst pretreatment unit for preheating and accelerating catalyst particles, wherein the powder feeder is connected with one end of the catalyst pretreatment unit, the other end of the catalyst pretreatment unit is connected with one end of the product synthesis unit, and the other end of the product synthesis unit is connected with the product collection unit; a carbon source mixed gas inlet is formed in the end part of one end, connected with the catalyst pretreatment unit, of the product synthesis unit. The device and the method are easy to implement, large-scale continuous preparation of the single-walled carbon nanotubes is facilitated, and the device and the method have great significance in boosting industrialization of the single-walled carbon nanotubes, have similar effects on other similar reactors and have certain universality.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a device and method for preparing single-wall carbon nanotubes by scalable floating catalytic cracking. Background technique [0002] Single-walled carbon nanotubes (SWCNTs), as a new type of nanomaterials with excellent mechanical and electrical properties, as well as huge aspect ratio and high specific surface area, have potential in electrochemical energy storage, catalysis, composites and nanodevices. application prospects. Many universities, scientific research institutions and companies at home and abroad are studying how to combine the large-scale production of single-walled carbon nanotubes. [0003] So far, there are three main methods for preparing single-walled carbon nanotubes: arc method, laser ablation method and plasma CVD chemical vapor deposition method. Compared with these methods, floating catalytic chemical vapor deposition (FCCVD) is a kind of...

Claims

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Application Information

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IPC IPC(8): C01B32/159C01B32/162C01B32/164
CPCC01B32/159C01B32/162C01B32/164
Inventor 常艺陈名海徐乐乐梁晨陶宇轩
Owner JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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