Carbon nanotube/silicon carbide foam catalytic composite material and preparation method thereof

A technology of foamed silicon carbide and carbon nanotubes, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the difficulty of separating carbon nanotube coil structures, increase the difficulty of carbon nanotubes, and carbon nanotubes The problem of low density of the pipeline group is achieved by a simple and easy method, which is beneficial to heat conduction and resists pressure drop.

Inactive Publication Date: 2013-03-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes have a good graphitized structure, and their mechanical properties are generally higher than those of carbon nanofibers. The density of carbon nanotube coils obtained by the same method is low and requires secondary treatment, which greatly increases the ability of carbon nanotubes to form macrostructures. difficulty
At the same time, the carbon nanotube coil structure will face the difficulty of separation in the liquid phase reaction

Method used

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  • Carbon nanotube/silicon carbide foam catalytic composite material and preparation method thereof
  • Carbon nanotube/silicon carbide foam catalytic composite material and preparation method thereof
  • Carbon nanotube/silicon carbide foam catalytic composite material and preparation method thereof

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Embodiment 1

[0034] (1) Foamed silicon carbide pretreatment: (a) Put the foamed silicon carbide into acetone and ethanol solutions successively, and ultrasonically clean each for 20 minutes. (b) Wash the foamed silicon carbide obtained in step (a) in deionized water to remove impurities on the surface of the foamed silicon carbide, dry the sample and collect it for later use. Figure (1) is a scanning electron microscope picture of foamed silicon carbide.

[0035] (2) Catalyst loading on the surface of foamed silicon carbide: Prepare the precursor solution of the composite catalyst according to the catalyst ratio, and mix iron nitrate, magnesium nitrate, aluminum nitrate, urea and deionized water according to the ratio of 0.2g: 0.1g: 2g: 10g and 150ml Proportions were put into a three-necked flask and stirred to form a uniform solution. Put 1 g of foamed silicon carbide in step (1) into the solution in the above-mentioned three-necked flask. Then the three-necked flask was put into an oil...

Embodiment 2

[0042] (1) Foamed silicon carbide pretreatment: (a) Put the foamed silicon carbide into acetone and ethanol solutions successively, and ultrasonically clean each for 40 minutes. (b) Wash the foamed silicon carbide obtained in step (a) in deionized water to remove impurities on the surface of the silicon carbide, dry the sample and collect it for later use.

[0043] (2) Catalyst supported on the surface of foamed silicon carbide: Prepare the precursor solution of the composite catalyst according to the catalyst ratio, put iron nitrate, magnesium nitrate, aluminum nitrate, urea and deionized water according to the ratio of 2g: 6g: 4g: 45g and 250ml into a three-necked flask, and stirred to form a uniform solution. Put 10 g of the foamed silicon carbide in step (1) into the solution of the above-mentioned three-necked flask and soak it. Then the three-necked flask was put into an oil bath, stirred at a rotation speed of 30 rpm, and the temperature was raised to 100° C., and a co...

Embodiment 3

[0046] (1) Foamed silicon carbide pretreatment: (a) Put the foamed silicon carbide into acetone and ethanol solutions successively, and ultrasonically clean each for 60 minutes. (b) Wash the foamed silicon carbide obtained in step (a) in deionized water to remove impurities on the surface of the silicon carbide, dry the sample and collect it for later use.

[0047] (2) Catalyst supported on the surface of foamed silicon carbide: Prepare the precursor solution of the composite catalyst according to the catalyst ratio, put iron nitrate, magnesium nitrate, aluminum nitrate, urea and deionized water in the ratio of 6g: 15g: 12g: 100g and 500ml into a three-necked flask, and stirred to form a uniform solution. Put 20 g of the foamed silicon carbide in step (1) into the solution of the above-mentioned three-neck flask for soaking. Then the three-neck flask was put into an oil bath, stirred at a rotation speed of 50 rpm, and the temperature was raised to 120° C., and a constant temp...

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Abstract

The invention provides a carbon nanotube / silicon carbide foam catalytic composite material and a preparation method thereof, and belongs to the technical field of composite materials and preparation thereof. The preparation method of the invention comprises the following steps: firstly pretreating the silicon carbide foam; then loading a Fe-Mg-Al composite catalyst on the pretreated silicon carbide foam by a coprecipitation method; performing in-situ growth of carbon nanotubes on the silicon carbide foam surface loaded with the catalyst by a chemical vapor deposition method. According to the composite material prepared by the method, carbon nanotubes are uniformly loaded on the silicon carbide carrier surface loaded with the composite catalyst, and cover the surface; the carbon nanotubes wind with each other to form a reticulate structure. The invention realizes macroscopic assembly of carbon nanotubes; the prepared composite material has good mechanical strength, can resist pressure drop in a catalytic reactor, prevent deficiency in strength of loose carbon tubes, and realize industrial application of carbon tubes with respect to catalysis.

Description

technical field [0001] The invention belongs to the technical field of composite materials and preparation thereof, and in particular relates to a carbon nanotube / foamed silicon carbide catalytic composite material and a preparation method thereof. Background technique [0002] Nanocarbon is a new type of carbon material, which has potential applications in many fields. Carbon nanotube is also a kind of nano carbon material. Since carbon tubes were discovered by Iijima in 1991, this nanomaterial with unique mechanical, thermal and electrical properties has aroused great research enthusiasm from researchers from all over the world. The researchers found that, in addition to potential applications in field-effect transistors, hydrogen storage devices, supercapacitors and engineering materials, carbon nanotubes are also a new type of carbon-based catalysts. Studies have found that carbon nanotubes exhibit good catalytic performance in catalytic reactions such as the oxidativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224B01J35/10
Inventor 苏党生孙振华袁华张劲松
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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