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Nano tungsten phosphide/carbon or tungsten nitride/carbon composite material and preparation method thereof

A technology of carbon composite materials and tungsten phosphide, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of small effective specific surface area of ​​materials and cumbersome process, and achieve safe and reliable production process , The process conditions are simple and easy to control, and the effect of high purity

Inactive Publication Date: 2020-02-21
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problems such as cumbersome preparation process of tungsten phosphide or tungsten nitride, the need to use toxic and harmful gases and the small effective specific surface area of ​​the obtained material, the present invention provides a nano-tungsten phosphide / carbon or tungsten nitride / carbon composite material and its preparation method

Method used

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  • Nano tungsten phosphide/carbon or tungsten nitride/carbon composite material and preparation method thereof
  • Nano tungsten phosphide/carbon or tungsten nitride/carbon composite material and preparation method thereof
  • Nano tungsten phosphide/carbon or tungsten nitride/carbon composite material and preparation method thereof

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preparation example Construction

[0029] The invention provides a preparation method of nano-tungsten phosphide / carbon or tungsten nitride / carbon composite material, comprising the following steps:

[0030] Dissolving the tungsten source and the carbon source in a solvent to obtain a mixed solution; adjusting the pH value of the mixed solution to be alkaline;

[0031] The mixed solution is heated and evaporated to dryness to obtain a solid precursor;

[0032] Calcining the precursor under a protective atmosphere to obtain a solid powder;

[0033] Phosphating the solid powder with a phosphating agent under a protective atmosphere to obtain a tungsten phosphide / carbon composite material;

[0034] Alternatively, the solid powder is nitrided by a nitriding agent under a protective atmosphere to obtain a tungsten nitride / carbon composite material.

[0035] The above preparation method is explained in detail below.

[0036] Specifically, the used tungsten source and carbon source should be able to dissolve in the...

Embodiment 1

[0058] A preparation method of nano tungsten phosphide / carbon composite material, comprising the following steps:

[0059] (1). Dissolve 300mg of ammonium metatungstate in 70mL of deionized water, and stir until the ammonium metatungstate is completely dissolved, about 5 minutes;

[0060] (2). Add 300 mg of dopamine hydrochloride to the ammonium metatungstate solution obtained in step (1), and continue stirring until dopamine hydrochloride is completely dissolved for about 15 minutes to obtain the first mixed solution;

[0061] (3). Add 270 mL of absolute ethanol to the first mixed solution, stir until uniform, and add about 1 mL of ammonia water therein, stir evenly, the pH is 8.6, and continue to stir for about 12 hours to obtain the second mixed solution;

[0062] (4). Heat the second mixed solution in a water bath heating device to evaporate the solvent to obtain a precursor, then place the obtained precursor in a drying oven and dry at 60°C for about 8 hours to obtain the...

Embodiment 2

[0072] A preparation method of nanometer tungsten nitride / carbon composite material, comprising the following steps:

[0073] (1). Dissolve 300mg of ammonium metatungstate in 70mL of deionized water, and stir until the ammonium metatungstate is completely dissolved, about 5 minutes;

[0074] (2). Add 300 mg of dopamine hydrochloride to the ammonium metatungstate solution obtained in step (1), and continue stirring until dopamine hydrochloride is completely dissolved for about 15 minutes to obtain the first mixed solution;

[0075] (3). Add 270 mL of absolute ethanol to the first mixed solution, stir until uniform, and add about 1 mL of ammonia water therein, stir evenly, and continue to stir for about 12 hours to obtain a second mixed solution;

[0076] (4). Heat the second mixed solution in a water bath heating device to evaporate the solvent to obtain a precursor, then place the obtained precursor in a drying oven and dry at 60°C for about 8 hours to obtain the first solid ...

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Abstract

The invention relates to the technical field of catalyst materials, in particular to a nano tungsten phosphide / carbon or tungsten nitride / carbon composite material and a preparation method thereof. The preparation method comprises the following steps of dissolving a tungsten source and a carbon source in a solvent to obtain a mixed solution; adjusting a pH value of the mixed solution to be alkaline; heating and evaporating the mixed solution to dryness to obtain a solid precursor; calcining the precursor under a protective atmosphere to obtain solid powder; performing phosphating treatment onthe solid powder by using a phosphating agent under the protective atmosphere to obtain a tungsten phosphide / carbon composite material; or nitriding the solid powder by using a nitriding agent in a protective atmosphere to obtain the tungsten nitride / carbon composite material. The preparation method provided by the invention has the advantages of being safe and reliable in production process, simple and easily-controlled in process conditions, low in production cost, and suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials, and in particular relates to a nano-tungsten phosphide / carbon or tungsten nitride / carbon composite material and a preparation method thereof. Background technique [0002] Platinum and other precious metals are widely used in the catalytic process of petrochemical industry, organic synthesis, fuel cell, automobile and electronic industry because of their catalytic effect. On the other hand, the price is very expensive and the application cost is high. Because of this, people have been looking for new catalytic materials that can replace noble metal catalysts such as platinum. [0003] Among numerous new catalytic materials, tungsten phosphide (WP) or tungsten nitride (WN) exhibits platinum-like catalytic properties due to its surface properties and adsorption characteristics. Since the discovery of its catalytic properties, it has been regarded as a potential material that can partia...

Claims

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Application Information

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IPC IPC(8): B01J27/188B01J27/24B01J35/02B01J35/08B01J35/10C25B1/04C25B11/06H01M4/88H01M4/90
CPCB01J27/188B01J27/24C25B1/04C25B11/04H01M4/90H01M4/9041H01M4/9083H01M4/8825B01J35/33B01J35/60B01J35/51B01J35/40B01J35/61Y02E60/36Y02E60/50
Inventor 冯其尧克光邹杰鑫廖建华李辉王海江
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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