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Method using cobalt-based catalyst for preparation of carbon nanofiber by carbon dioxide hydrogenation

A cobalt-based catalyst, carbon nanofiber technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of high reaction energy consumption, high reaction conditions, and complex reaction steps. , to achieve the effect of high catalytic efficiency and convenient use

Active Publication Date: 2015-09-09
ZHEJIANG OCEAN UNIV
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Problems solved by technology

The shortcomings of using nickel-based catalysts to prepare carbon nanofibers are: the catalytic efficiency of nickel-based catalysts is low. To catalyze the reaction, nickel-based catalysts must first be activated by hydrogen reduction. Otherwise, nickel-based catalysts will not be activated by hydrogen. No or only a small amount of nanofibers are formed
Such reaction energy consumption is high, and reaction step is complicated, and the condition requirement of reaction is higher

Method used

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  • Method using cobalt-based catalyst for preparation of carbon nanofiber by carbon dioxide hydrogenation
  • Method using cobalt-based catalyst for preparation of carbon nanofiber by carbon dioxide hydrogenation
  • Method using cobalt-based catalyst for preparation of carbon nanofiber by carbon dioxide hydrogenation

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preparation example Construction

[0020] K-Co-CeO 2 Catalyst preparation

[0021] Prepared by co-precipitation method, after cobalt nitrate solution and cerium nitrate solution are mixed uniformly, sodium hydroxide and sodium carbonate are used as precipitating agents, and the molar ratio of sodium hydroxide and sodium carbonate to sodium hydroxide and sodium carbonate is 1:1, and Flow titration, in this process, the pH value of the precipitation solution is controlled within the range of 10±0.1, stirred at room temperature for 4-5h, aged overnight, then filtered, washed repeatedly with distilled water until pH2 catalyst.

[0022] Impregnation of Co-CeO with a mass percent of Co of 1%-30% by potassium nitrate solution 2 Catalyst, dried at 80-100°C for 20-24h, then calcined in a muffle furnace at 500-800°C for 3-4h to obtain K-Co-CeO 2 catalyst.

[0023] 2%K-10%Co-CeO with 10% cobalt mass percentage and 2% potassium mass percentage 2 Catalyst as an example, the specific steps are as follows:

[0024] Weigh...

Embodiment 1

[0028] Using 60-100 mesh 1%K-10%Co-CeO 2 The catalyst is used as a catalyst for carbon dioxide hydrogenation to prepare carbon nanofibers. 1%K-10%Co-CeO 2 Catalyst and 60-100 mesh quartz sand are mixed evenly according to the weight ratio of 1:2, and the raw material gas is passed, and 1mg 1%K-10%Co-CeO 2 Catalyst meter, feed gas ventilation rate is 2ml / min, feed gas composition is 50vol.%CO 2 , 50vol.%H 2 ; Catalyzed reaction at 500°C for 2h to obtain carbon nanofibers.

Embodiment 2

[0030] Using 60-100 mesh 2%K-10%Co-CeO 2 The catalyst is used as a catalyst for carbon dioxide hydrogenation to prepare carbon nanofibers. 2%K-10%Co-CeO 2 Catalyst and 60-100 mesh quartz sand are mixed evenly according to the weight ratio of 1:2, and the raw material gas is passed, and 1mg 2%K-10%Co-CeO 2 Catalyst meter, feed gas ventilation rate is 2ml / min, feed gas composition is 50vol.%CO 2 , 50vol.%H 2 ; Catalyzed reaction at 500°C for 2h to obtain carbon nanofibers.

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Abstract

The invention discloses a method using a cobalt-based catalyst for preparation of carbon nanofiber by carbon dioxide hydrogenation, and a carbon dioxide and hydrogen mixture is used as a raw material gas for catalytic reaction at the temperature of 450-600 DEG C under the catalysis effect of the cobalt-based catalyst to obtain the carbon nanofiber. According to the method, the cobalt-based catalyst is used for the catalytic reaction for the first time, catalytic efficiency is high, activation is not needed, and the cobalt-based catalyst can be directly used in the reaction for preparation of carbon nanofiber by carbon dioxide hydrogenation, and the cobalt-based catalyst is safe and convenient to use.

Description

technical field [0001] The invention relates to a method for preparing carbon nanofibers, in particular to a method for preparing carbon nanofibers by hydrogenating carbon dioxide with a cobalt-based catalyst. Background technique [0002] In recent years, the conversion and utilization of the greenhouse gas carbon dioxide has attracted widespread attention of researchers. Carbon dioxide can generate carbon nanofibers through catalytic hydrogenation reaction. Carbon nanofiber is a fibrous nano-carbon material with high strength, light weight, good thermal conductivity and high electrical conductivity. It is potentially used in hydrogen storage materials, high-capacity electrode materials, high-performance composite materials, and fuel cells. High-performance products such as batteries and leads. [0003] At present, there are few researches on catalysts for carbon dioxide hydrogenation to prepare carbon nanofibers. It has been reported that nickel-based catalysts can be u...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00B82Y40/00
Inventor 王路辉刘辉陈英杨淑清
Owner ZHEJIANG OCEAN UNIV
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