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Method oxide catalyst and method for preparing bundled multiwall nano carbon tube

A technology of multi-walled carbon nanotubes and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Contains many impurities, catalyst utilization rate and catalytic efficiency are not high, and achieves the effect of strong activity, high utilization rate and good graphitization degree

Inactive Publication Date: 2005-11-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has problems such as low catalyst utilization rate and low catalytic efficiency, resulting in low quality carbon tubes and many impurities in primary products.

Method used

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  • Method oxide catalyst and method for preparing bundled multiwall nano carbon tube
  • Method oxide catalyst and method for preparing bundled multiwall nano carbon tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take ferric nitrate nonahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equivalent to the molar number of magnesium nitrate hexahydrate at a molar ratio of Fe: Mo: Mg of 1:10:10, mix and dissolve in distilled water to form a transparent solution, After the sol is formed, put it into a porcelain boat, and use the combustion method to heat the sol in a muffle furnace at 700°C, then bake it at this temperature for 10 minutes, take out the formed solid, cool it, and grind it finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reaction furnace. Put 0.105 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 900 sccm and hydrogen with a flow rate of 50 sccm, control the reaction temperature at 1000°C, and react for 30 minutes to obtain 2.876 grams of bundled multi-walled carbon nanotubes. The transmission electron microscope photos of the products are as follows: fi...

Embodiment 2

[0015] Take nickel nitrate hexahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equivalent to the molar number of magnesium nitrate hexahydrate at a molar ratio of Ni:Mo:Mg of 1:10:10, mix and dissolve in distilled water to form a transparent solution, After the sol is formed, put it into a porcelain boat, and use the combustion method to heat the sol in a muffle furnace at 700°C, then bake it at this temperature for 10 minutes, take out the formed solid, cool it, and grind it finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reaction furnace. Put 0.145 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 900 sccm and hydrogen with a flow rate of 50 sccm, control the reaction temperature at 1000°C, and react for 30 minutes to obtain 3.442 grams of bundled multi-walled carbon nanotubes.

Embodiment 3

[0017] Take ferric nitrate nonahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equivalent to the molar number of magnesium nitrate hexahydrate at a molar ratio of Fe: Mo: Mg of 1:10:10, mix and dissolve in distilled water to form a transparent solution, Using the sol-gel method, after forming a sol, put it in a drying oven at 120°C for 2 hours, transfer it to a porcelain boat after foaming, and then bake it in a muffle furnace at 750°C for 30 minutes, take out the formed solid and cool it Grind finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reaction furnace. Put 0.091 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 900 sccm and hydrogen with a flow rate of 50 sccm, control the reaction temperature at 1000°C, and react for 45 minutes to obtain 2.866 grams of bundled multi-walled carbon nanotubes. Thermogravimetric analysis TGA curve, such as figure 2 As s...

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Abstract

The present invention relates to a metal oxide catalyst and a method for preparing bundled multiwall nano carbon tube by using said metal oxide catalyst and catalytic cracking methane, said metal oxide catalyst is the Fe / Mo / MgO and Ni / Mo / MgO catalyst formed from oxide of magnesium and molybdenum as main catalyst and iron or nickel as auxiliary catalyst. Said catalyst is placed in the fixed bed gas continuously-flowing reaction furnace, and the methane whose introduced flow rate is 50-1500 sccm and the hydrogen gas or nitrogen gas or inert gas whose flow rate is 50-300 sccm are reacted for 10-100 min. at 750-1200 deg.C so as to form the invented bundled multiwall nano carbon tube.

Description

technical field [0001] The invention relates to a metal oxide catalyst and a method for using the metal oxide catalyst to catalyze and crack methane to prepare bundled multi-wall nanometer carbon tubes. Background technique [0002] Carbon nanotubes, a new material discovered in the 1990s, are typical representatives of one-dimensional structural materials and nanomaterials. Chemical vapor deposition (CVD) is currently the most promising method for industrial mass production of carbon nanotubes due to its high yield, simple operation, and low investment, and thus has become the most popular method for preparing carbon nanotubes. This method usually uses a metal-supported solid catalyst to perform a gas-solid phase heterogeneous reaction by cracking organic gases such as methane, acetylene, ethylene, and propylene on a fixed bed, and finally obtains carbon nanotubes. However, this method has problems such as low catalyst utilization rate and low cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01J23/887C01B31/02
Inventor 李昱张孝彬陶新永刘芙张文魁涂江平
Owner ZHEJIANG UNIV
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