Carbon-coated transition metal nano composite material 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, can solve the problems of small metal nanoparticles, many fine powders, complex preparation process, etc., and achieve good low-temperature activity, The effect of improving mass transfer efficiency and improving transfer efficiency

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
[0006] In addition, the carbon-coated metal nanoparticles are small and there are many fine powders, which will cause some problems in some special fields, such as fixed-bed reactors.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] (1) Weigh 10 g of nickel acetate and 20 g of citric acid into 20 mL of deionized water, and stir at 50° C. to obtain a homogeneous solution.

[0114] (2) Add 2 g of silicon dioxide (Grace Company, model 2485) to the homogeneous solution obtained in step (1), continue stirring for 2 h, and heat and evaporate to dryness to obtain a solid microsphere precursor.

[0115] (3) Place the precursor obtained in step (2) in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed nitrogen gas at a flow rate of 100mL / min, and raise the temperature to 5°C / min. 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 nanocomposite material containing a carrier.

[0116] The percentages of elements contained in the surface of the nanocomposite obtained by XPS analysis are: carbon 81.99 at%, oxygen 13.41 at%, nickel 1.36 at%, silicon 3.24...

Embodiment 2

[0120] (1) Weigh 10 g of nickel acetate and 20 g of citric acid into 60 mL of deionized water, and stir at 70° C. to obtain a homogeneous solution.

[0121] (2) Add 4 g of pseudo-boehmite to the homogeneous solution obtained in step (1), continue stirring for 2 h, and heat and evaporate to dryness to obtain the solid microsphere precursor.

[0122] (3) Place the precursor obtained in step (2) in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed nitrogen gas at a flow rate of 100mL / min, and raise the temperature to 5°C / min. 650°C, keep the temperature constant for 1 hour, stop heating, and cool to room temperature under nitrogen atmosphere to obtain a carbon-coated transition metal nanocomposite material containing a carrier.

[0123] The percentages of elements contained on the surface of the material obtained by XPS analysis are: carbon 80.48 at%, oxygen 15.17 at%, nickel 0.73 at%, aluminum 3.62 at%.

[0124] The TEM...

Embodiment 3

[0127] (1) Weigh 10 g of cobalt acetate and 10 g of ethylenediaminetetraacetic acid, add 150 mL of deionized water, and stir at 30° C. to obtain a homogeneous solution.

[0128] (2) Add 1 g of silicon dioxide (Grace Company, model 955) to the homogeneous solution obtained in step (1), continue stirring for 2 h, and evaporate to dryness by heating to obtain a solid microsphere precursor.

[0129] (3) Place the precursor obtained in step (2) in the porcelain boat, then place the porcelain boat in the constant temperature zone of the tube furnace, feed nitrogen gas at a flow rate of 100mL / min, and raise the temperature to 5°C / min. 750°C, keep the temperature constant for 1 hour, stop heating, and cool to room temperature under a nitrogen atmosphere to obtain a carbon-coated cobalt nanocomposite material containing a carrier.

[0130] The percentages of elements contained on the surface of the composite material obtained by XPS analysis are: carbon 85.84at%, oxygen 6.94at%, cobalt...

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Abstract

The invention provides a carbon-coated transition metal nano composite material, which comprises a carrier and a core-shell structure loaded on the carrier. The shell layer of the core-shell structureis an oxygen-containing graphitized carbon layer, and the inner core of the core-shell structure is transition metal nano particles. The core-shell structure is constructed by taking transition metals as an inner core and the transition metals are loaded on a carrier to form the nano composite material, so that the mass transfer efficiency and the strength of the nano composite material are improved, and the material has a good particle morphology and little fine powder and can be better applied to a fixed bed reactor. In addition, the nano composite material can also be a hierarchical pore structure material with rich mesopores or micro-pores and mesopores, and is beneficial to better play a role in more applications, especially in the application of the catalysis field.

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, 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 will lead to the stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/75B01J23/78B01J35/10C07C211/46C07C209/36C07C211/52C07C35/08C07C29/20C07C29/145C07C31/10C07C213/02C07C215/76C07C217/84C07C5/03C07C15/073C07C5/10C07C13/18C07C29/141C07C31/12B01D53/86B01D53/72
CPCB01J23/755B01J23/75B01J23/78B01J35/008B01J35/10B01J35/0033C07C209/36C07C209/365C07C29/20C07C29/145C07C213/02C07C5/03C07C5/10C07C29/141B01D53/8668B01D2257/7022C07C211/46C07C211/52C07C35/08C07C31/10C07C215/76C07C217/84C07C15/073C07C13/18C07C31/12Y02E50/30Y02P20/52
Inventor 谢婧新荣峻峰宗明生于鹏郑金玉吴耿煌纪洪波林伟国
Owner CHINA PETROLEUM & CHEM CORP
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