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Carbon-coated transition metal nano composite material containing alkaline-earth metals as well as preparation method and application thereof

A technology of nanocomposite materials and transition metals, which is applied in the field of carbon-coated transition metal nanocomposites and its preparation, which can solve problems such as the complexity of the preparation process, achieve excellent performance, improve efficiency, and have good industrial application prospects

Inactive Publication Date: 2020-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of mesoporous carbon materials are mainly catalytic activation method, organogel carbonization method and template method, but the preparation process of these methods is still too complicated

Method used

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  • Carbon-coated transition metal nano composite material containing alkaline-earth metals as well as preparation method and application thereof
  • Carbon-coated transition metal nano composite material containing alkaline-earth metals as well as preparation method and application thereof
  • Carbon-coated transition metal nano composite material containing alkaline-earth metals as well as preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0104] The present invention also provides a kind of preparation method of above-mentioned nanocomposite material, comprising:

[0105] placing transition metal salt, polyvalent organic carboxylic acid and nitrogen-containing compound in a solvent and mixing to form a homogeneous solution;

[0106] removing the solvent in the homogeneous solution to obtain a precursor;

[0107] The precursor is pyrolyzed once under an inert atmosphere or a reducing atmosphere;

[0108] The product after the primary pyrolysis is contacted with the solution containing the alkaline earth metal, and then dried; wherein, the contacting method includes immersing the product after the primary pyrolysis in the alkaline earth metal solution, Or the product after the primary pyrolysis is placed in the alkaline earth metal solution and stirred. The time of immersion or stirring should not be too long or too short, preferably between 10 min and 300 min, the temperature is preferably 0°C to 100°C, and th...

Embodiment 1

[0130] (1) Weigh 10g of nickel acetate, 10g of citric acid, and 20g of hexamethylenetetramine, add them to a beaker containing 30mL of deionized water, stir at 70°C to obtain a homogeneous solution, and continue heating and evaporating to dryness Obtain a solid precursor. Tests have proved that the solid precursor obtained in this step is soluble in water.

[0131] (2) Place the solid precursor obtained in step (1) 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 set the temperature at a rate of 5°C / min. Raise the temperature to 650°C, stop the heating after keeping the temperature for 2 hours, and cool to room temperature under a nitrogen atmosphere to obtain a carbon-coated nickel material.

[0132] (3) Weigh 2g of the carbon-coated nickel material obtained in step (2), add 4mL of an aqueous solution containing 0.5128g of magnesium nitrate, soak for 24h, and then dry...

Embodiment 2

[0139] (1) Weigh 10g of nickel acetate, 20g of citric acid, and 20g of hexamethylenetetramine, add them into a beaker containing 100mL of deionized water, stir at 80°C to obtain a homogeneous solution, and continue heating and evaporating to dryness to obtain solid precursor.

[0140] (2) Place the solid precursor obtained in step (1) in a porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed in nitrogen gas with a flow rate of 150mL / min, and heat at a rate of 5°C / min. The temperature was raised to 600°C, the temperature was kept constant for 2 hours, the heating was stopped, and the carbon-coated nickel material was obtained by cooling to room temperature under a nitrogen atmosphere.

[0141] (3) Weigh 2 g of the carbon-coated nickel material obtained in step (2), add 4 mL of an aqueous magnesium nitrate solution containing 0.8589 g, impregnate for 24 h, and then dry at 120° C.

[0142] (4) The dried material obtained in ste...

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Abstract

The present invention provides a carbon-coated transition metal nano composite material containing alkaline-earth metals. The nano composite material comprises a core-shell structure having a shell layer and an inner core, the shell layer is a graphitized carbon layer containing alkaline earth metals, nitrogen and oxygen, and the inner core is transition metal nano particles. Alkaline earth metalsof the shell layer of the nano composite material and transition metals of the inner core generate a synergistic effect, so that the catalytic performance of the nano composite material is improved.The content of nitrogen and oxygen in the graphitized carbon layer is adjustable, so that the electronic features of the graphitized carbon layer can be adjusted to adapt to different catalytic reactions.

Description

technical field [0001] The invention relates to the field of carbon-coated metal composite materials, in particular to a carbon-coated transition metal nanocomposite material containing alkaline earth metals and a preparation method and application thereof. Background technique [0002] Studies have shown that nano-carbon catalysts represented by carbon fibers, nano-diamonds, carbon nanotubes, (oxidized) graphene, etc., can catalyze direct dehydrogenation, oxidative dehydrogenation, halogenation, hydroxylation, alkylation and aldehydes of hydrocarbons. A series of reactions such as liquid phase oxidation and condensation reaction of ketones have catalytic activity. The active sites of nano-carbon catalysts are mainly the structural defects and heteroatom functional groups of the carbon material itself. Therefore, in order to improve the catalytic activity of nano-carbon materials, it is necessary to increase the number of structural defects and heteroatom functional groups, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/75B01J23/78B01J35/10C07C5/05C07C15/073C07C5/03C07C13/18B01D53/86B01D53/72
CPCB01J23/755B01J23/75B01J23/78C07C5/05C07C5/03B01D53/8668B01D2257/7022B01J35/397B01J35/33B01J35/60C07C15/073C07C13/18
Inventor 谢婧新荣峻峰宗明生于鹏吴耿煌纪洪波林伟国
Owner CHINA PETROLEUM & CHEM CORP
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