Carbon-coated nickel carbide nano composite material as well as preparation method and application thereof

A nanocomposite material, nickel carbide technology, applied in chemical instruments and methods, hydrogenation hydrocarbon production, organic chemistry, etc.

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, there is still a lack of a green, simple, and low-cost method for preparing carbon-coated nickel carbide nanocomposites with controllable doping elements in the field.

Method used

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  • Carbon-coated nickel carbide nano composite material as well as preparation method and application thereof
  • Carbon-coated nickel carbide nano composite material as well as preparation method and application thereof
  • Carbon-coated nickel carbide nano composite material as well as preparation method and application thereof

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preparation example Construction

[0043] A second aspect of the present invention provides a method for preparing the above carbon-coated nickel carbide nanocomposite, comprising the following steps:

[0044] The nickel source, carboxylic acid and nitrogen-containing compound are placed in a solvent, heated and stirred to form a homogeneous solution;

[0045] removing the solvent in the homogeneous solution to obtain a precursor;

[0046] And the precursor is pyrolyzed under an inert atmosphere to obtain a nanocomposite material;

[0047] Wherein, the pyrolysis temperature is 350°C to 390°C.

[0048] According to the present invention, in early studies, the inventors found that carbon-coated nickel nanocomposites can be obtained by precursor pyrolysis, for example, patent CN 109309213A discloses a carbon-coated nickel nanocomposite and its preparation method , wherein the temperature of the precursor constant temperature section is 425°C to 800°C. In fact, the temperature range for the preparation of carbon...

Embodiment 1

[0067] This example is used to illustrate the preparation of the carbon-coated nickel carbide nanocomposite material of the present invention.

[0068] Weigh 10.51g (50mmol) of citric acid monohydrate, 4.64g (50mmol) of nickel hydroxide, 6.31g (75mmol) of dicyandiamide into 200mL of deionized water, stir at 105°C to obtain a homogeneous solution, and continue to heat and evaporate to dryness , the precursor is obtained after grinding the solid.

[0069] Take 7.5g of the obtained precursor and place it in a porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed nitrogen gas with a flow rate of 100mL / min, and raise the temperature to 390°C at a rate of 2°C / min, and keep the temperature constant for 120min Then stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a nitrogen-doped carbon-coated nickel carbide nanocomposite material.

[0070] Material Characterization:

[0071] figure 1 It is the X-ray...

Embodiment 2

[0073] Weigh 14.61g (50mmol) of ethylenediaminetetraacetic acid, 9.27g (100mmol) of nickel hydroxide into 200mL of deionized water, stir at 110°C to obtain a homogeneous solution, then lower the temperature to 90°C and add 4.20g (50mmol) of dihydrogen Cyanamide and continue to heat and evaporate to dryness, and the precursor is obtained after grinding the solid.

[0074] Take 7g of the obtained precursor and place it in a porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, pass nitrogen gas at a flow rate of 100mL / min, and raise the temperature to 370°C at a rate of 2°C / min, and keep the temperature for 120min Stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a nitrogen-doped carbon-coated nickel carbide nanocomposite material.

[0075] Transfer the obtained nitrogen-doped carbon-coated nickel carbide nanocomposite to a flask, add 50 mL of deionized water, stir at 60°C for 20 minutes, then filter wi...

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Abstract

The invention provides a carbon-coated nickel carbide nano composite material, which comprises a core-shell structure with a shell layer and an inner core, the shell layer is a graphitized carbon layer doped with oxygen and nitrogen, the inner core is nickel carbide nano particles, based on the total mass of the nano composite material, the nitrogen content is 12%-28%, and the content ratio of nitrogen to oxygen is 1: 1-3: 1. The nano composite material adopts a method of pyrolyzing a metal salt precursor, green, simple and low-cost preparation of the novel carbon-coated nickel carbide nano composite material with controllable doped elements can be realized by controlling reaction conditions and parameters, and the obtained material has a good application prospect in catalytic hydrogenation reaction or electrocatalytic reaction and the like.

Description

technical field [0001] The invention relates to the technical field of transition metal carbide composite materials, in particular to a carbon-coated nickel carbide nanocomposite material and its preparation method and application. Background technique [0002] Transition metal carbides are a class of mesenchymal compounds produced by embedding carbon atoms into transition metal lattices, which have the properties of covalent solids, ionic crystals, and transition metals. Because transition metal carbides have many excellent properties, including high hardness, high melting point, and high conductivity, and have applications in supercapacitors, catalysis, and electrocatalysis, they have attracted extensive attention from researchers. [0003] Nickel carbide is a typical transition metal carbide, and its main synthesis methods include vapor phase deposition, mechanical alloying and liquid phase method. For example, Sarr et al. (J.Phys.Chem.C, 2014, 118(40), 23385–23392) depo...

Claims

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Application Information

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IPC IPC(8): B01J27/22C07C5/03C07C15/073
CPCB01J27/22C07C5/03B01J35/33C07C15/073
Inventor 吴耿煌荣峻峰达志坚宗明生于鹏纪洪波
Owner CHINA PETROLEUM & CHEM CORP
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