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Nano-nickel catalyst loaded on grapheme and preparation method thereof

A technology of graphene and nano-nickel, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increasing the production cost of nano-nickel, large nickel particle size, Environmental pollution and other problems, to avoid catalyst activity, concentrated size distribution, and simple preparation process

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It has been reported in the literature that graphene and nickel composite materials are prepared by reducing graphite oxide and nickel chloride mixture with hydrazine hydrate. The nickel particles prepared by this method are large in size and difficult to control, and the agglomeration is serious. The reducing agents such as hydrazine hydrate are harmful to the environment. more serious pollution
During its preparation, it is usually necessary to add dispersants, organic solvents, etc. to inhibit its agglomeration, which increases the production cost of nano-nickel to a certain extent.

Method used

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  • Nano-nickel catalyst loaded on grapheme and preparation method thereof
  • Nano-nickel catalyst loaded on grapheme and preparation method thereof
  • Nano-nickel catalyst loaded on grapheme and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 3g of natural flake graphite to 120ml of sulfuric acid with a mass concentration of 98%, and slowly add 15g of potassium permanganate while stirring the mixture at a rate of 200rpm in an ice-water bath; During the process, continue to stir for 1 hour; raise the temperature of the water bath to 65°C and stir for 2 hours, while stirring, slowly add 250ml of deionized water, add deionized water to the resulting mixture to 1400ml, then add 30ml of hydrogen peroxide with a mass concentration of 30%, and react 20min. The resulting product was centrifuged and washed with dilute hydrochloric acid with a mass concentration of 5%, until no SO 4 2- (with BaCl 2 test), the obtained washings were dried at a temperature of 60°C in a vacuum drying oven to obtain graphite oxide; 100 mg of graphite oxide prepared in the above steps was dispersed in 100 ml of deionized water, and ultrasonically peeled for 2 hours to obtain graphite oxide with a concentration of 1 mg / ml Alkene solu...

Embodiment 2

[0020] The process of preparing the nano-nickel catalyst supported on graphene in this embodiment is the same as that of Example 1, except that the nickel nitrate hexahydrate that is dissolved in 55 ml of ethanol solution with a volume concentration of 50% is changed from 55 mg to 22.5 mg. mg, and finally prepare nano-nickel loaded on graphene, the loading amount of nano-nickel is 5wt.%, and the average particle size of nano-nickel is 5-10nm.

Embodiment 3

[0022] The process of preparing the nano-nickel catalyst loaded on graphene in this embodiment is the same as that of Example 1, except that the nickel nitrate hexahydrate that is dissolved in 55ml volume concentration of 50% ethanol solution is changed from 55mg to 16.5 mg, and finally prepare nano-nickel loaded on graphene, the loading amount of nano-nickel is 5wt.%, and the average particle size of nano-nickel is 5-10nm.

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Abstract

The invention discloses a nano-nickel catalyst loaded on grapheme and a preparation method thereof. The catalyst adopts grapheme as a carrier, which is loaded with 1 mass percent-10 mass percent of nickel particles with a particle size of 5-10nm. The preparation method comprises the steps of: preparing the purchased or self-made grapheme into an ethanol solution, preparing a precursor of grapheme-loaded nickel oxide with an ethanol solution of nickel nitrate hexahydrate and an ethanol solution of grapheme, reducing the precursor so as to obtain the nano-nickel catalyst loaded on grapheme. Grapheme with high strength, big specific surface area and stable structure is taken as the catalyst carrier, and the catalyst has high activity, long service life. Also nickel particles loaded on grapheme have a small size and centralized size distribution ranging from 5 to 10nm. And nickel nano-particles are uniformly dispersed on the grapheme carrier. The preparation method provided in the invention has the advantages of simple preparation process, easy operation, low cost, and less pollution.

Description

technical field [0001] The invention relates to a nano-nickel catalyst loaded on graphene and a preparation method thereof, belonging to the nickel-loaded catalyst technology. Background technique [0002] Graphene is a new type of carbon material that has been extensively studied in recent years. Its structure is a two-dimensional honeycomb lattice structure formed by the close packing of a single layer of carbon atoms. Due to its excellent electrical, thermal and mechanical properties, graphene has become a hot research material in just a few years after its appearance. [0003] On the one hand, graphene has a unique two-dimensional planar structure, and is the thinnest material found so far, with a thickness of only one-hundredth of a hair, so it has a large specific surface area, with a theoretical value of 2600m 2 / g, and has a stronger adsorption capacity than the commonly used catalyst carrier, which can adsorb more catalyst particles, thereby greatly improving the ...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10
Inventor 师春生于艳敏赵乃勤刘恩佐何春年李家俊
Owner TIANJIN UNIV
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