Porous nickel and carbon compound and preparation method of porous nickel and carbon compound

A carbon composite and porous nickel technology, applied in the field of materials, can solve the problems of porous nickel mechanical strength, uncontrollable activity, narrow electrochemical window, and limited application range, so as to save separation costs, increase coating speed, and improve The effect of reaction efficiency

Active Publication Date: 2017-05-10
江苏中天碳基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the porous nickel used for catalytic reactions in the above-mentioned prior art in mechanical strength, uncontrollable activity, high density (not easy to suspend in fluid), and overcome the mechanical strength of the porous nickel film used in the field of electrochemical energy storage poor, narrow electrochemical window, and limited application range. The purpose of the present invention is to provide a composite of porous nickel and carbon and its preparation method. Based on chemical vapor deposition technology, a continuous carbon layer is generated on the surface of porous nickel to form Unique porous nickel-carbon composite structure, and according to needs, create pores in the continuous carbon layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Porous nickel particles with a diameter of 20 microns were placed in a fluidized bed-chemical vapor deposition furnace, and a carbon-containing source gas (ethylene, C 1 -C 6 Alcohol, and hydrogen, the mixture of argon, the volume fraction is respectively 45%, 50%, 1%, 4%) 3 hours, stop passing through carbon source to cool down then. At room temperature, under the protection of nitrogen, the obtained product is taken out to obtain a porous nickel-carbon composite with a dense carbon-coated layer. Then the above product was uniformly mixed with KOH at a mass ratio of 1:0.2, and treated at 1000°C for 3 hours under a nitrogen atmosphere. Then keep nitrogen flowing to lower the temperature, after cooling down to room temperature, the sample is taken out. Wash with deionized water until neutral, and dry at room temperature. The complex can be used as a hydrogenation catalyst in a stirred tank. The micropores on the carbon layer allow the nickel inside to be completely d...

Embodiment 2

[0030] Put porous nickel particles with a diameter of 300 microns into a moving bed-chemical vapor deposition furnace, and pass through a carbon source and nitrogen source gas (acetylene, acetone, formaldehyde, pyridine, a mixture of hydrogen and argon at 900 ° C, the volume fraction 10%, 20%, 20%, 1%, 30%, 19%) for 0.3 hours, and then stop passing carbon source and nitrogen source to cool down. At room temperature, under the protection of nitrogen, the obtained product is taken out to obtain a porous nickel-carbon composite with a dense carbon-coated layer. Then the above product was uniformly mixed with KOH at a mass ratio of 1:2, and treated at 800°C for 3 hours under a steam atmosphere. Then keep passing water vapor to cool down, and after cooling down to room temperature, take out the sample. Wash with deionized water until neutral, and dry at room temperature. The nickel carbon composite, SP 2 The mass proportion of hybridized carbon in carbon is 60%, and the rest is ...

Embodiment 3

[0032] Put porous nickel particles with a diameter of 10 mm into a fixed bed-chemical vapor deposition furnace, and pass a carbon-containing source gas (a mixture of CO, ethyl acetate, hydrogen, and argon at 800 ° C, with volume fractions of 1%, 40 %, 40%, 19%) for 1 hour, then stop feeding the carbon source to cool down. At room temperature, under the protection of nitrogen, the obtained product is taken out to obtain a porous nickel-carbon composite with a dense carbon-coated layer. Then the above product was uniformly mixed with KOH at a mass ratio of 1:1, and treated under a steam atmosphere at 900°C for 1 hour. Then keep passing water vapor to cool down, and after cooling down to room temperature, take out the sample. Wash with deionized water until neutral, and dry at room temperature. The nickel carbon composite, SP 2 The mass proportion of hybridized carbon in carbon is 70%, and the rest is SP 3 hybridized carbon. The ratio of the total mass of functional groups s...

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Abstract

The invention discloses a porous nickel and carbon compound and a preparation method of the porous nickel and carbon compound. A continuous carbon layer coats the surface of porous nickel and micro-pores are formed in the carbon layer; the carbon comprises one or more of functional groups including hydrogen, oxygen, nitrogen and the like; the preparation method of the porous nickel and carbon compound comprises the following steps: putting the porous nickel into a chemical vapor deposition device and introducing a carbon source or a mixture of the carbon source and a nitrogen source and the like at a high temperature; generating the continuous carbon layer on the surface of the porous nickel within certain time. According to the porous nickel and carbon compound, the porous nickel can have a plurality of forms including small grains, blocks or membrane-shaped objects and the like; the nickel and carbon compound can be used as a hydrogenation catalyst in different reactors; compared with pure porous nickel, the porous nickel and carbon compound has the advantages of small density, high mechanical strength, small abrasion in the reactors and controllable hydrogenation degree; the porous nickel and carbon compound can also be used as a multifunctional current collector for 1V to 4V electrochemical energy storage, and has the advantages of electrochemical capacitance higher than that of pure foam nickel and great mechanical strength and is suitable for being continuously coated.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a composite of porous nickel and carbon and a preparation method thereof. Background technique [0002] Nickel-based materials are widely used in industry, mainly including various conductive applications, stainless steel applications and catalysts for catalytic reactions. For example, alloying nickel and aluminum and then removing the aluminum with alkali may produce porous nickel with mostly micropores, which has extremely high activity in various liquid-phase hydrogenation reactions and is widely used. However, due to the high density, high activity and low mechanical strength of this type of porous nickel, when there is mechanical stirring in the reactor, it is often polished by the stirring blade, and the catalyst is severely pulverized and lost. At the same time, the finer the particles, the higher the reactivity, which often leads to the occurrence of various side react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C01B32/05
CPCB01J23/755B01J35/31B01J35/396
Inventor 骞伟中张晨曦杨周飞田佳瑞于翔
Owner 江苏中天碳基材料有限公司
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