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A method for preparing carbon nanofibers by hydrogenation of carbon dioxide

A carbon nanofiber, carbon dioxide technology, applied in nanotechnology, nanocarbon, nanotechnology and other directions for materials and surface science, can solve the problems of high reaction energy consumption, high reaction conditions, complex reaction steps, etc. Easy to use, high catalytic efficiency

Inactive Publication Date: 2017-04-12
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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  • A method for preparing carbon nanofibers by hydrogenation of carbon dioxide

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preparation example Construction

[0019] Co-CeO 2 Catalyst preparation

[0020] 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.

[0021] Co-CeO with a mass percentage of Co of 10% 2 Catalyst is taken as an example, prepared by co-precipitation method, the specific steps are as follows:

[0022] Weigh 0.988 Co(NO 3 ) 2 ·6H 2 O and 4.540g of Ce(NO 3 ) 3 ·6H 2 O, added to 200ml of deionized water to make nitrate solution A; weigh 0.800g of NaOH and 2.120g of NaOH with an electronic balance 2 CO 3 , was added to 2...

Embodiment 1

[0025] Using 60-100 mesh Co-CeO with a mass percentage of Co of 10% 2 The catalyst is used as a catalyst for carbon dioxide hydrogenation to prepare carbon nanofibers. 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 1mgCo-CeO 2 Catalyst meter, feed gas ventilation rate is 2ml / min, feed gas composition is 50vol.%CO 2 , 50vol.%H 2 ; Catalyzed reaction at 450°C for 2h to obtain carbon nanofibers.

Embodiment 2

[0027] Using 60-100 mesh Co-CeO with a mass percentage of Co of 10% 2 The catalyst is used as a catalyst for carbon dioxide hydrogenation to prepare carbon nanofibers. 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 1mgCo-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 present invention discloses a method for preparing carbon nano-fibers through the carbon dioxide hydrogenation process, wherein a mixed gas of carbon dioxide and hydrogen is adopted as a feed gas to be subjected to the catalytic reaction under the catalytic effect of a cobalt-cerium catalyst at 450-600 DEG C to obtain carbon nano-fibers. According to the invention, the cobalt-cerium catalyst is firstly adopted to catalyze the reaction, thus being high in catalytic efficiency and activation-free. The cobalt-cerium catalyst can be directly applied to the carbon dioxide hydrogenation process to prepare carbon nano-fibers. Therefore, the 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 hydrogenation of carbon dioxide. 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. Research reports have found that nickel-based catalysts can be used to hydrogenate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15B82Y30/00B82Y40/00
Inventor 邱胡飞刘辉王路辉严海峰水双董静吟
Owner ZHEJIANG OCEAN UNIV
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