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Ferriferous oxide for preparing nanometer carbon fiber and its preparation and uses

A nano-iron oxide, nano-carbon fiber technology, applied in the chemical characteristics of fibers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unfavorable application in the field of catalysis, destroying the structure and surface chemical state of carbon nano-fibers, etc. The effect of low cost, simple composition and easy preparation process

Inactive Publication Date: 2006-07-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the existing carbon nanofibers are often prepared with Al 2 o 3 and SiO 2 The supported Ni, Co, and Fe are catalysts, so concentrated alkali (KOH or NaOH) and concentrated acid (HNO 3 or HF) to remove the residual catalyst carrier and active metal in carbon nanofibers by heating and reflowing for many times, but this operation often destroys the fiber structure and surface chemical state of carbon nanofibers itself, which is unfavorable for its later application in the field of catalysis

Method used

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  • Ferriferous oxide for preparing nanometer carbon fiber and its preparation and uses
  • Ferriferous oxide for preparing nanometer carbon fiber and its preparation and uses
  • Ferriferous oxide for preparing nanometer carbon fiber and its preparation and uses

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Embodiment 1

[0026] Weigh 160gFeCl 2 , Dissolved in deionized water, adjusted pH to 2 with 0.1M HCl, added 20g of iron powder, heated to 60°C, kept at a constant temperature for 15 minutes, filtered after cooling, and calibrated the preparation concentration by potassium permanganate titration method, and adjusted its concentration to 1M.

[0027] Weigh FeCl 3 .6H 2 0600g, dissolved in deionized water, filtered, calibrated the concentration by potassium permanganate titration and adjusted the concentration to 2M.

[0028] 1MFeCl for each 2 Solution 1L and 2MFeCl 3 Solution 1L, mix well.

[0029] Weigh 800g of NaOH and dissolve it in deionized water to prepare 2L of 10M solution.

[0030] Transfer the mixed iron salt solution and lye to 2L reaction tanks A and B respectively, and pressure the reaction solutions in A and B into the T-shaped reaction tube at the same time under the nitrogen pressure of 0.2MPa and transfer them to the reactor for aging at 90°C for 2 hours . The precipitate was coo...

Embodiment 2

[0032] 1.0 g of the catalyst was spread flat in a quartz boat, which was placed in the constant temperature section in the middle of the reactor. In Ar: H 2 =120:40mL / min in the mixed air flow, program the temperature to 600°C, and keep it for 3 hours. Then switch the gas to reaction gas, CO:H 2 =80:20mL / min, the reactor temperature continues to be maintained at 600°C, after the growth process lasts for 16 hours, switch to 80mL / min argon gas, stop heating, and allow it to cool naturally to room temperature to obtain 14.2g of black powdery product. Observe the obtained black powdery products separately by scanning electron microscope, see figure 2 . From figure 2 It can be seen that the obtained black powder product is nano-carbon fiber with a diameter of 50-200nm. Elemental analysis shows that the carbon content exceeds 95%. Its XRD pattern (such as Figure 8 Shown), indicating that the degree of graphitization is very high.

Embodiment 3

[0034] As in Example 2, the difference is that a mixed gas of ethylene and hydrogen is used as the carbon source to obtain 22.3 g of carbon nanofibers. Its scanning electron microscope photos such as image 3 Shown.

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Abstract

The invention discloses a making method and appliance of ferric oxide catalyst, which comprises the following steps: mixing the hybrid solution of bivalence and tervalence iron salt with excessive alkaline liquor at 85-95 deg C for 1-3 h; collecting the deposition to wash until the pH value is between 6.5 and 7.5; dispersing the filter cake in the organic solvent; filtering; drying the filter cake in the vacuum with even grain size at 10 nm. The invention displays narrow grain size, which can be applied to prepare nanometer carbon fiber.

Description

Technical field [0001] The invention relates to a catalyst for preparing nano carbon fiber and its preparation and application. Background technique [0002] Carbon nanofibers have attracted much attention due to their unique and strange physical and chemical properties and their potential application prospects. There are many methods for producing carbon nanofibers, but the gas phase catalytic pyrolysis method has become the most likely industrialized mass production method due to its high yield, simple operation and low investment. This method is usually based on loading on different carriers such as Al 2 O 3 , SiO 2 Transition metals such as Fe, Co, Ni and MgO and their alloys are used as catalysts. The particles of the active components of the catalyst are usually required to be less than 10nm. Low-carbon hydrocarbon compounds are used as the carbon source to prepare the diameter medium at 500~1200℃. Nano carbon fiber in 30~400nm. Carbon nanofibers are expected to be used as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/03C01B31/02D01F9/12
Inventor 周静红隋志军李平朱俊周兴贵戴迎春袁渭康
Owner EAST CHINA UNIV OF SCI & TECH