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Catalyst of metallic oxide for preparing nanowall nano carbon pipe and preparation process thereof

A technology of carbon nanotubes and oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Problems such as low yield, low utilization rate and low catalytic efficiency can achieve the effect of high degree of graphitization, strong activity and high utilization rate

Inactive Publication Date: 2006-01-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are endless preparation methods for catalysts required for the production of single-walled carbon nanotubes, but due to their low utilization and catalytic efficiency, the yield of single-walled carbon nanotubes obtained is not high, and the primary products contain more impurities.

Method used

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  • Catalyst of metallic oxide for preparing nanowall nano carbon pipe and preparation process thereof
  • Catalyst of metallic oxide for preparing nanowall nano carbon pipe and preparation process thereof
  • Catalyst of metallic oxide for preparing nanowall nano carbon pipe and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Molybdenum oxide was added to the deionized aqueous solution, heated and stirred at 80° C. for 0.5 hour, until the reaction was completely dissolved. Dissolve iron nitrate nonahydrate and magnesium ethylate in the molybdenum-containing solution respectively, stir for 1 hour, and mix uniformly. The molar ratio of iron:molybdenum:magnesium in the solution is 2:0.5:15. Then the above mixed solution was frozen at -60°C, and then the solid formed by freezing was subjected to a primary drying treatment at -30°C for 36 hours to remove crystal water in the freeze-dried solid, and then a secondary drying treatment was performed at 30°C for 6 hours. The above freeze-dried catalyst can be used for the preparation of single-walled carbon nanometer tubes.

[0015] The preparation of single-wall carbon nanotubes is carried out in a fixed-bed gas continuous flow reactor. Put 0.112 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a f...

Embodiment 2

[0017] Ammonium molybdate was added to the deionized aqueous solution, heated and stirred at 80°C for 0.5 hours until the reaction was completely dissolved. Dissolve ferric nitrate nonahydrate and magnesium ethylate in the molybdenum-containing solution respectively, stir for 1 hour, and mix uniformly. The molar ratio of iron:molybdenum:magnesium in the solution is 1:0.1:15. Freeze, and then perform a 24-hour primary drying process on the frozen solid at -30°C to remove crystal water in the freeze-dried solid, and then perform a secondary drying process at 40°C for 6 hours. The above freeze-dried catalyst can be used for the preparation of single-walled carbon nanometer tubes.

[0018] The carbon tubes were prepared in a fixed-bed gas continuous flow reaction furnace. Put 0.103 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 75 sccm and hydrogen with a flow rate of 200 sccm, control the reaction temperature a...

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Abstract

A metallic oxide catalyst Fe / Mo / MgO for preparing single-wall carbon nano-tubes is proportionally composed of MgO as carrier, oxide of Fe as primary catalyzing component and Mo as co-catalyst. Its preparing process includes such steps as proportionally mixing the Fe salt, Mo salt (or oxide) and Mg salt in de-ionized water or alcohol solution, freezing at -100--40 deg. C, drying at -40--10 deg. C for 12-48 hr, and drying again at 20-60 deg. C for 6-12 hr. Its advantage is high catalytic activity.

Description

technical field [0001] The invention relates to a metal oxide catalyst for preparing single-wall nanometer carbon tubes and a preparation method thereof. Background technique [0002] Single-walled carbon nanotubes are seamless, hollow tubes formed by hexagonal carbon atom ring grids. The head and tail are each composed of half a Fullerian carbon sphere, similar to graphite, and the carbon valence bond of carbon nanotubes There are freely movable electrons. Compared with multi-wall carbon nanotubes, single-wall carbon nanotubes have many excellent material properties. Among all the preparation methods, chemical vapor deposition (CVD) is considered to be the most commercially promising method due to its equipment, simple operation, low investment, and low reaction temperature. At present, there are endless preparation methods for catalysts required for the production of single-walled carbon nanotubes, but due to their low utilization and catalytic efficiency, the yield of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J23/881
Inventor 罗君航张孝彬程继鹏李昱陶新永刘芙黄宛真罗志强李婷
Owner ZHEJIANG UNIV
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