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

A nano-composite material, transition metal technology, applied in metal/metal oxide/metal hydroxide catalysts, separation methods, carbon compound catalysts, etc., can solve the problems of complex preparation process, achieve high mass transfer efficiency and improve efficiency , good repeatability

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 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

[0102] The present invention also provides a kind of preparation method of above-mentioned nanocomposite material, comprising:

[0103] mixing the transition metal salt and the polyvalent organic carboxylic acid in a solvent to form a homogeneous solution;

[0104] removing the solvent in the homogeneous solution to obtain a precursor;

[0105] The precursor is pyrolyzed once under an inert atmosphere or a reducing atmosphere;

[0106] 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 the contact reaction is preferably p...

Embodiment 1

[0129] (1) Weigh 10g of nickel acetate and 10g of citric acid into a beaker containing 30mL of deionized water, stir at 70°C to obtain a homogeneous solution, continue heating and evaporate to dryness, and obtain a solid precursor.

[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 material obtained in step (2), add 4ml of an aqueous solution containing 0.1528g of magnesium nitrate, soak at room temperature for 24h, and then dry the product at 120°C.

[0132] (4) The dried material obtained in step (3) is placed in a porcelain boat, and then the porcelain...

Embodiment 2

[0138] (1) Weigh 10g of nickel acetate and 20g of citric acid into a beaker containing 50mL of deionized water, stir at 80°C to obtain a homogeneous solution, continue heating and evaporate to dryness, and obtain a solid precursor.

[0139] (2) The solid obtained in step (1) is placed in a porcelain boat, and then the porcelain boat is placed in the constant temperature zone of the tube furnace, and the nitrogen gas with a flow rate of 150mL / min is fed into it, and the temperature is raised to 600°C, keep the temperature constant for 2 hours, stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a carbon-coated nickel material.

[0140] (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, soak at room temperature for 24 h, and then dry the product at 120° C.

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

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Abstract

The invention provides a carbon-coated transition metal nano composite material containing alkaline-earth metals and a preparation method and application thereof. The nano composite material comprisesa core-shell structure with a shell layer and an inner core, the shell layer is a graphitized carbon layer containing alkaline earth metals and oxygen, and the inner core is transition metal nano particles. Alkaline earth metals of the shell layer of the nano composite material and transition metals of the inner core generate a synergistic effect, thus the catalytic performance of the nano composite material becomes better; and the nano composite material shows good repeatability, high activity and high selectivity when being used as a catalyst, and can be applied to various catalytic reactions, such as catalytic oxidation reaction and catalytic hydrogenation reaction.

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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IPC IPC(8): B01J23/755B01D53/86B01D53/72B01D53/44B01J35/02B01J35/10C07C5/03C07C13/18C07C15/073
CPCB01J23/78C07C5/03B01D53/8668B01D53/8687B01D2255/20746B01D2255/20753B01D2255/702B01D2255/2047B01D2257/7022B01D2257/708C07C2601/14C07C2523/78B01J35/33B01J35/40B01J35/50B01J35/615B01J35/633B01J35/69B01J35/647C07C13/18C07C15/073
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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