Method for preparing vermicular mesoporous tungsten carbide/charcoal composite material

A carbon composite material, tungsten carbide technology, applied in chemical instruments and methods, chemical/physical process, physical/chemical process catalyst, etc., can solve the problem of ineffective catalytic effect, easy agglomeration of tungsten carbide particles, small specific surface area, etc problem, to achieve the effect of saving platinum catalyst, uniform distribution of tungsten carbide particles, and simple steps

Inactive Publication Date: 2012-09-12
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tungsten carbide particles prepared by this method are easy to agglomerate and have a small specific surface

Method used

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  • Method for preparing vermicular mesoporous tungsten carbide/charcoal composite material
  • Method for preparing vermicular mesoporous tungsten carbide/charcoal composite material
  • Method for preparing vermicular mesoporous tungsten carbide/charcoal composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 40°C, weigh 10.0g of surfactant F127 and completely dissolve it in a mixed solution of 120.0g of ethanol and 30.0g of water, then add 5.0g of melamine-formaldehyde prepolymer and 2.5g of ammonium metatungstate aqueous solution (wt.%= 33.3), and vigorously stirred for 30 minutes to obtain a "water-in-oil" microemulsion. The above-mentioned microemulsion was placed in an open vessel, and stood at 40°C for 24 hours to obtain a colorless sticky substance, and then placed in an oven, and cured at 105°C for 12 hours to obtain a resinous material. Then grind it into pieces, place it in a tube furnace, feed a mixture of nitrogen and hydrogen with a flow rate of 30 mL / min and a volume ratio of 3:1, gradually raise the temperature to 900°C, and calcinate for 3 hours at a programmed heating rate 5°C / min. Then it is naturally cooled and ground to obtain a worm-like mesoporous tungsten carbide / carbon composite material.

Embodiment 2

[0027] At 40°C, weigh 10.0g of surfactant F127 and completely dissolve it in a mixed solution of 100.0g of ethanol and 50.0g of water, then add 5.0g of melamine-formaldehyde prepolymer and 5.0g of ammonium metatungstate aqueous solution (wt.%= 33.3), and vigorously stirred for 30 minutes to obtain a "water-in-oil" microemulsion. The above microemulsion was placed in an open petri dish, and stood at 40°C for 24 hours to obtain a colorless viscous liquid, then placed in an oven, and cured at 105°C for 48 hours to obtain a resinous material. Then grind it into pieces, place it in a tube furnace, feed a mixture of nitrogen and hydrogen with a gas flow rate of 40 mL / min and a volume ratio of 3:1, gradually raise the temperature to 1000°C, and calcinate for 3 hours at a programmed heating rate 5°C / min. Then it is naturally cooled and ground to obtain a worm-like mesoporous tungsten carbide / carbon composite material.

Embodiment 3

[0029] At 40°C, weigh 8.0g of surfactant P123 and completely dissolve it in a mixed solution of 100.0g of ethanol and 20.0g of water, then add 5.0g of phenol-formaldehyde prepolymer and 2.0g of ammonium metatungstate aqueous solution (wt.%= 33.3), and vigorously stirred for 30 minutes to obtain a "water-in-oil" microemulsion. The above microemulsion was placed in an open petri dish, and stood at 40°C for 24 hours to obtain a colorless viscous liquid, then placed in an oven, and cured at 105°C for 24 hours to obtain a resinous material. Then grind it into pieces, place it in a tube furnace, feed a mixture of nitrogen and hydrogen with a flow rate of 30 mL / min and a volume ratio of 3:1, gradually raise the temperature to 900°C, and calcinate for 3 hours at a programmed heating rate 5°C / min. Then it is naturally cooled and ground to obtain a worm-like mesoporous tungsten carbide / carbon composite material.

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Abstract

The invention discloses a method for preparing a vermicular mesoporous tungsten carbide/charcoal composite material. The method comprises the following steps: (1) dissolving a surfactant in a mixed solution of ethanol and water, sequentially adding a carbon source and a tungsten source, and violently stirring for 15 to 60 minutes to form water-in-oil microemulsion; (2) putting the microemulsion obtained in the step (1) in an open utensil, evaporating at the temperature of between 30 and 60 DEG C to remove a mixed solvent, and curing at the temperature of between 100 and 150DEG C for 6 to 48 hours to obtain a solid product; and (3) in reducing atmosphere, calcining the solid product obtained in the step (2) at the temperature of between 700 and 1,600DEG C for 1 to 7 hours, and cooling and grinding to obtain the vermicular mesoporous tungsten carbide/charcoal composite material. The method has simple steps, quick and time-saving; and the prepared vermicular mesoporous tungsten carbide/charcoal composite material has the characteristics of vermicular pores, uniform distribution of tungsten carbide particles, single phase and the like.

Description

technical field [0001] The invention relates to a preparation method of a worm-like mesoporous tungsten carbide / carbon composite material, and also relates to the preparation of a catalyst or a catalyst carrier in electrochemistry and organic synthesis. Background technique [0002] Studies have shown that tungsten carbide has catalytic activity similar to platinum, stable physical and chemical properties, and low price. With people's emphasis on clean energy, the application of tungsten carbide in the field of catalysis, such as direct methanol fuel cells, catalytic hydrogen evolution, ultra-large capacitors and catalytic desulfurization, has attracted widespread attention from scientists. In the field of electrochemistry, the advantage of tungsten carbide as an anode catalyst is that it not only has catalytic performance and can replace precious metals such as platinum and palladium, but is also not easily poisoned by carbon monoxide. Therefore, tungsten carbide catalyst ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10H01M4/90
CPCY02E60/50
Inventor 夏燎原胡云楚袁利萍
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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