Carbon-coated transition metal nano composite material containing alkali 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, and achieve the effects of improving catalytic performance, good repeatability, and improving efficiency

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

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Experimental program
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Effect test

preparation example Construction

[0103] The present invention also provides a kind of preparation method of above-mentioned nanocomposite material, comprising:

[0104] placing transition metal salt, polyvalent organic carboxylic acid and nitrogen-containing compound in a solvent and mixing to form a homogeneous solution;

[0105] removing the solvent in the homogeneous solution to obtain a precursor;

[0106] The precursor is pyrolyzed once under an inert atmosphere or a reducing atmosphere;

[0107] The product after the primary pyrolysis is contacted with a solution containing an alkali metal, and then dried; wherein, the method of contacting includes immersing the product after the primary pyrolysis in the alkali metal solution, or The product after the primary pyrolysis is placed in the alkali 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 the contact reaction is pr...

Embodiment 1

[0129] (1) Weigh 10g of nickel acetate, 10g of citric acid and 20g of hexamethylenetetramine into a beaker filled with 30mL of deionized water, stir at 70°C to obtain a homogeneous solution, and continue to heat and evaporate to dryness to obtain a solid precursor body. Tests have proved that the solid precursor obtained in this step is soluble in water.

[0130] (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.

[0131] (3) Weigh 2g of the carbon-coated nickel material obtained in step (2), add 15mL of 1M KOH aqueous solution, stir at room temperature for 24h, filter, and then dry the prod...

Embodiment 2

[0138] (1) Weigh 10g of nickel acetate, 20g of citric acid, and 20g of hexamethylenetetramine into a beaker containing 100mL of deionized water, stir at 80°C to obtain a homogeneous solution, and continue to heat and evaporate to dryness to obtain a solid precursor .

[0139] (2) Put the precursor obtained in step (1) in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed nitrogen gas with a flow rate of 150mL / min, and raise the temperature at a rate of 5°C / min to 600°C, keep the temperature for 2 hours, stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a carbon-coated nickel material.

[0140] (3) Weigh 2g of the carbon-coated nickel material obtained in step (2), add 4mL aqueous sodium carbonate solution containing 0.3290g, stir at room temperature for 24h, filter, and finally dry the product at 120°C.

[0141] (4) The dried material obtained in step (3) is placed in a porcelain boat, an...

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Abstract

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

Description

technical field [0001] The invention relates to the field of carbon-coated metal composite materials, in particular to an alkali metal-containing carbon-coated transition metal nanocomposite material, 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, but this wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/10C07C5/05C07C15/073C07C5/03C07C13/18B01D53/86B01D53/72
CPCB01J23/78B01J35/10B01J35/0086B01J35/0033C07C5/05C07C5/03B01D53/8668B01D2257/7022C07C15/073C07C13/18
Inventor 荣峻峰谢婧新宗明生于鹏吴耿煌纪洪波林伟国
Owner CHINA PETROLEUM & CHEM CORP
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