Method for preparing carbon nano-tube array on particle interior surface

A carbon nanotube array and intra-particle technology, applied in gaseous chemical plating, metal material coating process, coating, etc., can solve problems affecting continuous growth, shape change, etc., and achieve easy process, equipment, and simple operation , continuous easy effect

Active Publication Date: 2009-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during this kind of growth, the particles need to be in a static or slightly moving state - because the carbon nanotube array on the outer surface is extremely vulnerable to strong collisions between particles, resulting in changes in its shape, which seriously affects its continuous growth

Method used

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  • Method for preparing carbon nano-tube array on particle interior surface
  • Method for preparing carbon nano-tube array on particle interior surface
  • Method for preparing carbon nano-tube array on particle interior surface

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The Fe / Mo system is used as the catalyst active component, and the vermiculite is used as the catalyst carrier. Vermiculite is a natural layered aluminosilicate compound composed of tens of thousands of vermiculite sheets superimposed on each other. The vermiculite sheets superimposed on each other form the inner surface of vermiculite particles with a radius of curvature not less than 500nm. figure 2 It is a process flow diagram of an embodiment of the invention. The process contains carrier gas nitrogen storage tank 1, hydrogen storage tank 2, carbon source gas ethylene storage tank 3, carrier gas and reducing gas preheater 4, carbon source gas preheater 5, catalyst activation reactor 6, carbon nano The tube array growth reactor has a built-in cyclone separator 7 , a carbon nanotube array growth reactor 8 , a product purification device 9 , and a product storage tank 10 . Weigh 10kg of Fe(NO 3 ) 3 9H 2 O and 1kg (NH 4 )Mo 7 o 24 4H 2 O, put it into 100L of de...

Embodiment 2

[0052] The Ni / Mo system is used as the catalyst active component, and the vermiculite is used as the catalyst carrier. Weigh 1000g of Ni(NO 3 ) 2 ·6H 2 O and 100g of (NH 4 )Mo 7 o 24 4H 2 O, put it into 10L of deionized water to make a mixed solution, weigh 2000g of vermiculite with an average particle size of 120μm, put it in it, soak it at 60°C for 14h, filter, wash, and dry to obtain the Ni-loaded solution on the inner surface. / Mo active component of vermiculite catalyst. Put 200g of the catalyst into a fixed-bed activation reactor with a diameter of 30mm, and at 500°C, flow a mixed gas of carbon monoxide and nitrogen to carry out the reduction reaction, wherein carbon monoxide and nitrogen are mixed at a volume ratio of 1:5, and the reduction air 0.3 hours -1 ; Send the reduced catalyst to a fluidized bed reactor with an inner diameter of 150 mm through a high flow rate of nitrogen, the reaction temperature is 750 ° C, and a mixed gas of ethylene, hydrogen, and ni...

Embodiment 3

[0054] The Co / Mo system is used as the catalyst active component, and the vermiculite is used as the catalyst carrier. Weigh 1000g of Co(NO 3 ) 2 ·6H 2 O and 100g of (NH 4 )Mo 7 o 24 4H 2 O, put it into 10L of deionized water to make a mixed solution, weigh 2000g of vermiculite with an average particle size of 120μm into it, soak it at 80°C for 14h, filter, wash, and dry to obtain a solution loaded with Co on the inner surface. / Mo active component of vermiculite catalyst. Put 200g of the catalyst into a fluidized bed activation reactor at 750°C, feed a flowing mixed gas of hydrogen and argon to carry out the reduction reaction, wherein hydrogen and argon are mixed at a volume ratio of 1:20, and the reduction space velocity is 1 Hour -1 ; The catalyst after reduction is sent to the fluidized bed reactor (I) that internal diameter is 250mm, and temperature of reaction is 650 ℃, feeds the mixed gas of ethylene and nitrogen in the reactor, and gas volume ratio is ethylene...

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Abstract

The invention provides a method for preparing carbon nano pipe arrays on the inner surface of a particle, belonging to the technical field of novel material and novel material preparation. In the method, the active metal components are loaded on the inner surface of the particle, and subjected to reduction or thermal decomposition to obtain a loaded type particle inner surface containing metal nano particles; the loaded type particle inner surface is subjected to chemical vapor deposition, and carbon nano pipe arrays grow up between the particle inner surfaces. By the physical or chemical separation, the carbon nano pipe arrays are separated from the particles, and the carbon nano pipe arrays with high purity are obtained, wherein in the method, the reaction speed and the operational conditions are controlled, the bed density of a reactor is kept between 10 and 1000kg/m<3>, and the carbon nano pipes/particles are in flowing/ fluidized states. The method has the advantages of being easily operated, realizing the mass production of the carbon nano pipe arrays and promoting the industrialized application of the carbon nano pipe arrays.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube array, in particular to a method for preparing a carbon nanotube array on the inner surface of a particle, and belongs to the technical field of new materials and its preparation. Background technique [0002] In 1991, Iijima observed the clear structure of carbon nanotubes (CNT) for the first time using high-resolution transmission electron microscopy. Due to its excellent mechanical and electrical properties, it has attracted the attention of many scholars and engineers in the world. The different preparation methods of carbon nanotubes will make the interaction relationship between a single CNT and different CNTs in the CNT macroscopic body different, which will have a great impact on the subsequent processing and application. In general, CNTs grown on disordered catalysts exhibit certain agglomerated structures. This carbon nanotube cluster can be catalyzed by a variety of powder ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C23C16/26C23C16/44C23C16/52
Inventor 魏飞张强赵梦强
Owner TSINGHUA UNIV
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