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Catalyst in use for preparing carbon fiber, preparation method and usage

A catalyst, carbon fiber technology, applied in the direction of fiber chemical characteristics, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low production volume, high price, price constraints, etc. Simple, high-yield, low-cost effects

Inactive Publication Date: 2006-11-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the industrial production of carbon nanofibers is still in its infancy, and the output of carbon nanofibers currently produced is low and the price is high.
The main reason for the limitation of output is that no catalyst with high reactivity suitable for industrialization has been developed.
Too low production volume and too high price restrict the application of carbon nanofiber

Method used

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  • Catalyst in use for preparing carbon fiber, preparation method and usage
  • Catalyst in use for preparing carbon fiber, preparation method and usage
  • Catalyst in use for preparing carbon fiber, preparation method and usage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O, the same below] 8.943g, copper nitrate [Cu(NO 3 ) 2 ·3H 2 O, the same below] 0.361g, citric acid 12.392g, fully dissolved in 20ml of water by stirring, and added dropwise ethyl orthosilicate [Si(OC 2 h 5 ) 4 , the same below] 0.347g, fully stirred, heated and evaporated to dryness into a solid, the resulting sample was transferred to a crucible, and roasted at 623K in a muffle furnace for 180 minutes to obtain a catalyst precursor, which was reduced to a catalyst by hydrogen, wherein Ni The percentage content is 90.3%, and the percentage content of Cu is 4.8%.

[0031] Weigh 25 mg of the catalyst precursor prepared above, put it into a horizontal quartz tube reactor, and purge it with nitrogen for 30 minutes at 423K, and switch to H2 with a flow rate of 1200ml / (min·gram of catalyst). 2 , H 2 In the atmosphere, the temperature is raised to 623K, and after keeping for 45 minutes, the temperature is raised to 848K, and th...

Embodiment 2

[0033] Except that the roasting temperature is 673K, the catalyst and its preparation process are the same as in Example 1. After the catalyst is reduced, the temperature is raised to 873K, and the flow rate is 1400ml / (minute·gram catalyst). 3 h 6 , the reaction was stopped after 90 minutes, and the product was collected. Weighed 2381 mg of carbon nanofibers. The yield was 95 g / g, and the carbon source gas conversion rate was 72%.

Embodiment 3

[0035] Catalyst and preparation process thereof are the same as embodiment 2, and after catalyst reduction, the temperature is raised to 898K, and the C 3 h 6, the reaction was stopped after 90 minutes, and the product was collected. Weighed 3254 mg of carbon nanofibers, the morphology of which is shown in figure 1 According to transmission electron microscope photos, the yield is 130g / g, and the conversion rate of carbon source gas is 70%.

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Abstract

A kind of catalyst that is used to prepare carbon fiber, the precursor of catalyst is the oxide compound of nickel, copper and silicon, and catalyst precursor is before using, and becomes the catalyst of the present invention through hydrogen reduction, and it is the nickel-copper alloy supported by silicon dioxide, nickel The mass percentage content of copper is 40.0-97.5%, the percentage content of copper is 59.0-2.0%, and the balance is silicon dioxide. The yield of carbon nanofibers prepared by the catalyst of the present invention is high (up to 654 grams of carbon nanofibers per gram of catalyst precursor), the service life of the catalyst is long (up to 600 minutes), and the conversion rate of carbon source gas is high (up to 600 minutes). 89%). The invention discloses a preparation method of the catalyst and a catalytic reaction condition for preparing nanometer carbon fiber with high yield.

Description

1. Technical field [0001] The invention relates to a high-yield catalyst for preparing nano-carbon fibers. The component is nickel-copper alloy supported by silicon dioxide, which can be used for catalytic cracking of carbon source gas (methane, propane, propylene) to prepare nano-carbon fibers. 2. Background technology [0002] Nanotechnology is a technology that was born in the late 1980s and is starting to use atoms and molecules to create new substances. It is to study the composition of substances with sizes ranging from a few tenths of a nanometer to hundreds of nanometers. In this extremely small space, it happens to be the space where atoms and molecules interact. Due to quantum effects, locality of matter, and huge surface and interface effects, many properties of matter undergo qualitative changes [see: Bonnell.D.A., Scanning Tunneling Microscopy and Spectroscopy—Theory, Techniques and Applications, New York: VCH Publishers, Inc, 1993]. [0003] As a very importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/70B01J23/755B01J21/08D01F9/12C01B31/02
Inventor 沈俭一孙清张惠良
Owner NANJING UNIV