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Metal oxide catalyst for preparing bundle-formed multiwall nano carbon tube, its preparation method and application

A technology of multi-walled carbon nanotubes and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low utilization and catalytic efficiency, nano The quality of carbon tubes is not high, the primary product has many impurities, etc., to achieve the effect of strong activity, high utilization rate and good graphitization degree

Inactive Publication Date: 2004-02-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low utilization rate and catalytic efficiency of metal-supported solid catalysts, the quality of carbon nanotubes obtained is not high, and the primary products contain more impurities.

Method used

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  • Metal oxide catalyst for preparing bundle-formed multiwall nano carbon tube, its preparation method and application
  • Metal oxide catalyst for preparing bundle-formed multiwall nano carbon tube, its preparation method and application
  • Metal oxide catalyst for preparing bundle-formed multiwall nano carbon tube, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0015] Add ammonium molybdate to ethylene glycol solution, heat and reflux at 90°C and stir for 4-6 hours until completely dissolved. Ferric nitrate nonahydrate and magnesium nitrate hexahydrate are respectively dissolved in hexanediol and slightly heated to form alkoxide. The molar ratio of iron:molybdenum:magnesium is 0.1:1:1. Keep it warm at 700°C for 30 minutes, take it out and cool it, and grind it finely to obtain a catalyst for preparing bundled multi-walled carbon nanotubes.

Embodiment 2

[0017] Add ammonium molybdate to ethylene glycol solution, heat and reflux at 90°C and stir for 4-6 hours until completely dissolved. Ferric nitrate nonahydrate and magnesium nitrate hexahydrate are respectively dissolved in hexanediol and slightly heated to form alkoxide, and the molar ratio of iron:molybdenum:magnesium is 0.1:1:1 and mixed. Transfer to a porcelain boat, burn at 700°C in a muffle furnace, then keep warm at this temperature for 10 minutes, take out the formed solid and cool it down and grind it finely to obtain a catalyst for preparing bundled multi-walled carbon nanotubes. SEM photographs of the catalyst are shown in figure 1 .

[0018] 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 minu...

Embodiment 3

[0020] Add ammonium molybdate to ethylene glycol solution, heat and reflux at 90°C and stir for 4-6 hours until completely dissolved. Cobalt nitrate hexahydrate and magnesium nitrate hexahydrate are respectively dissolved in hexanediol and slightly heated to form alkoxide, and the molar ratio of cobalt:molybdenum:magnesium is 0.1:1:1 and mixed. Transfer to a porcelain boat, burn at 700°C in a muffle furnace, keep warm at this temperature for 10 minutes, take out the formed solid and cool it down and grind it finely to obtain a catalyst for preparing bundled multi-walled carbon nanotubes. Figure 4 is the XRD pattern of the catalyst.

[0021] 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 ...

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PUM

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Abstract

The invented catalyst is a Fe / Mo / MgO, Co / Mo / MgO and Ni / Mo / MgO three-phase metal oxide catalyst for preparing bundled multi-wall nano carbon tube. The catalyst is made up by using oxide formed from magnesium and molybdenum as main catalyst and using iron or cobalt or nickel as co-catalyst. Its preparation method includes the following steps: firstly, according to the mole ratio of Fe or Co or Ni:Mo:Mg=0.1-1:0.5-2:0.8-3 uniformly mixing their alkoxides, combustion at 600-700 deg.C and heat-insulating for 10-40 min., cooling formed solid and grinding it or drying the formed solid at 80-150 deg.C, heat-insulating for 10-40 min., then cooling formed solid and grinding it.

Description

technical field [0001] The invention relates to a metal oxide catalyst for preparing bundled multi-wall carbon nanometer tubes and methods for preparing and using the same. 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, due to the low utilization rate and catalytic efficiency of metal-supported solid catalysts, the quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/88B01J23/883C01B31/02
Inventor 徐军明张孝彬李昱陶新永沈利华黄宛真杨晓芳孔凡志程继鹏陈飞刘芙丁志鹏
Owner ZHEJIANG UNIV
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