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Preparation and application of supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes

A technology of carbon nanotubes and single-walled carbon nanotubes, which is used in the preparation and application of supported cobalt sulfide catalysts for selective synthesis of carbon nanotubes, and can solve problems such as easy decomposition

Active Publication Date: 2019-11-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt sulfate catalyst is easy to decompose under certain high temperature conditions.

Method used

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  • Preparation and application of supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes
  • Preparation and application of supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes
  • Preparation and application of supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use a certain amount of deionized water to wet the fumed silica carrier first, and place it on a magnetic stirrer to stir for 10 minutes; add cobalt sulfide to the above silica mixture, and stir for 0.5 hours at room temperature; place the stirred mixture in an ultrasonic cleaner Ultrasonic dispersion for 2 hours; transfer the ultrasonicated mixture to a cell pulverizer for further dispersion for 2 hours; continue to stir on a magnetic stirrer at room temperature for 12 hours; then raise the temperature of the stirrer to 100°C to evaporate excess water, and place it in an oven at 100°C for drying Dry overnight; finally the dried sample is ground into a powder. Silica-supported cobalt sulfide catalysts with cobalt content of 1 wt%, 3 wt%, 5 wt%, 7 wt% and 10 wt% were respectively prepared according to the above steps.

[0032] figure 1 It is the X-ray diffraction pattern of the silica-supported cobalt sulfide catalysts with different cobalt contents prepared as describe...

Embodiment 2

[0034] The silica-loaded cobalt sulfide catalyst prepared in Example 1 with a cobalt content of 1 wt% is used for chemical vapor deposition to synthesize single-walled carbon nanotubes: 200 mg of the catalyst sample is spread in a porcelain boat, and the porcelain boat is sent into a tube furnace In the middle constant temperature zone, the catalyst is raised from room temperature to 600°C at a rate of 10°C / min in hydrogen, and then the hydrogen is replaced by argon immediately, and the temperature is kept at this rate; when the temperature rises to 900°C, the argon Air (200 sccm) was used to bubble absolute ethanol, and the steam entered the reactor for 30 minutes; the sample was naturally cooled to room temperature in an argon atmosphere to obtain single-walled carbon nanotubes.

Embodiment 3

[0036] The preparation described in Example 1 with a cobalt content of 1 wt% is used for the step of synthesizing carbon nanotubes by chemical vapor deposition using the silicon oxide-supported cobalt sulfide catalyst. Min heating rate from room temperature to 700°C

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Abstract

The invention provides preparation and application of a supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes. The experimental process comprises the following steps: (1) preparing a silicon dioxide loaded cobalt sulfide catalyst, namely preparing the silicon dioxide loaded cobalt sulfide catalyst from pure cobalt sulfide and a silicon dioxide carrier through the treatment modes of infiltration, dispersion, heating and stirring, drying, grinding and the like; and (2) researching the condition that the silicon dioxide loaded cobalt sulfide catalyst which takes ethanolas a carbon source and has the cobalt content of 1-10 wt% catalyzes the growth of the carbon nanotubes by adopting a chemical vapor deposition method under the conditions that the reduction temperature is 600-900 DEG C, the growth temperature is 900 DEG C and the temperature rises at the heating rate of 10 DEG C / min. The silicon dioxide loaded cobalt sulfide catalyst prepared by the method can beused for selectively synthesizing single-walled carbon nanotubes and multi-walled carbon nanotubes with narrower tube diameter distribution by a chemical vapor deposition method.

Description

technical field [0001] The invention relates to the preparation and application of a supported cobalt sulfide catalyst for selectively synthesizing carbon nanotubes Background technique [0002] As a new type of inorganic non-metallic nanomaterial, carbon nanotubes have a wide range of applications due to their good mechanical, thermal, electrical, magnetic, optical, adsorption, storage and electrochemical properties. Carbon nanotubes can be regarded as seamless hollow tubes rolled from single-layer or multi-layer graphene, which are called single-wall carbon nanotubes and multi-wall carbon nanotubes, respectively. The structure of single-walled carbon nanotubes can be expressed by the chiral index (n, m), and its typical diameter ranges from 0.6 to 2 nm. The diameter range of multi-walled carbon nanotubes is larger, which is determined by the number of graphene sheets. The distance between the layers is about 0.34-0.4nm, the innermost layer can reach 0.4nm, the thickest ca...

Claims

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Application Information

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IPC IPC(8): B01J27/043C01B32/162
CPCB01J27/043C01B32/162C01B2202/02C01B2202/04C01P2004/03
Inventor 王宏顾贵宾冯雪飞陈江萍孙林
Owner SOUTHWEST PETROLEUM UNIV
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