Ordered mesoporous carbon/tungsten carbide composite material and supported catalyst thereof and preparation method thereof

A tungsten carbide composite material and mesoporous carbon technology, applied in the field of material science, can solve the problems of cumbersome steps, high energy consumption, and difficulty in synthesizing orderly openings, and achieve high methanol oxidation catalytic activity, high specific surface area, and pore size distribution narrow effect

Inactive Publication Date: 2010-10-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these tungsten carbide materials lack a uniform and ordered microstructure, which also greatly affects their catalytic performance.
[0005] So far, although ordered porous carbon / tungsten carbide composites have been prepared by the hard template synthesis method, it is difficult to synthesize an ordered porous microstructure due to the presence of a high-energy C-C bond in the hard template method.
In addition, the synthesis process of the hard template method is cumbersome and consumes a lot of energy, which is not conducive to industrial production.

Method used

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  • Ordered mesoporous carbon/tungsten carbide composite material and supported catalyst thereof and preparation method thereof
  • Ordered mesoporous carbon/tungsten carbide composite material and supported catalyst thereof and preparation method thereof
  • Ordered mesoporous carbon/tungsten carbide composite material and supported catalyst thereof and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 6.5g of resorcinol in 10.2mL of formaldehyde, add 1.4mL of 5mol / L sodium hydroxide under stirring, then stir and mix evenly at 70°C for 3 hours, place in the refrigerator, and adjust pH=7 with hydrochloric acid solution And use methanol to prepare 20wt.% resole phenolic resin.

[0031] Add 5.6mL of resole phenolic resin, 0.2g of ammonium metatungstate and 0.5g of surfactant P123 into 15mL of ethanol, and add 5mL of deionized water under vigorous stirring to make the solution uniform. Pour the solution into a petri dish, evaporate to dryness, and dry at 120° C. to obtain a brown-yellow ordered mesoporous carbon / tungsten carbide composite material precursor.

[0032] Put the ordered mesoporous carbon / tungsten carbide composite precursor in a boat, place it in a muffle furnace, and under the protection of argon, heat it up to 800°C at 5°C / min, heat it for 6 hours, and cool it to get a composite material. From figure 1 It can be seen that the prepared samples hav...

Embodiment 2

[0034] Dissolve 6.5g of phenol in 10mL of formaldehyde, add 1.5mL of 5mol / L sodium hydroxide under stirring, then stir and mix evenly at 70°C for 1 hour, place in the refrigerator, adjust pH=7 with hydrochloric acid solution and use ethanol to prepare 20wt.% resole phenolic resin.

[0035] Add 6.0mL of resole phenolic resin, 0.1g of ammonium metatungstate and 1.0g of surfactant F127 into 20mL of ethanol, and add 10mL of deionized water under vigorous stirring to make the solution uniform. Pour the solution into a petri dish, evaporate to dryness, and dry at 100° C. to obtain a brown-yellow ordered mesoporous carbon / tungsten carbide composite material precursor.

[0036] Put the ordered mesoporous carbon / tungsten carbide composite precursor in a boat, place it in a muffle furnace, and under the protection of nitrogen, heat up to 1000°C at 5°C / min, heat it for 2 hours, and cool to obtain ordered mesoporous Carbon / tungsten carbide composite.

Embodiment 3

[0038] Dissolve 7.0g of phenol in 12mL of furfural, add 2.0mL of 6.0mol / L sodium hydroxide under stirring, then stir and mix evenly at 70°C for 3 hours, place in the refrigerator, adjust pH=7 with hydrochloric acid solution and prepare with methanol Into 20wt.% resole phenolic resin.

[0039] Add 5.0mL of resole phenolic resin, 0.3g of ammonium metatungstate and 1.1g of surfactant F127 into 40mL of ethanol, and add 10mL of deionized water under vigorous stirring to make the solution uniform. The solution was poured into a petri dish, evaporated to dryness, and dried at 110° C. to obtain a brown-yellow ordered mesoporous carbon / tungsten carbide composite material precursor.

[0040] Put the ordered mesoporous carbon / tungsten carbide composite precursor in a boat, place it in a muffle furnace, and under the protection of helium, heat up to 1200°C at 2°C / min, heat it for 3 hours, and cool to obtain an ordered mesoporous carbon Porous carbon / tungsten carbide composite.

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Abstract

The invention discloses a preparation method for an ordered mesoporous carbon/tungsten carbide composite material and a supported catalyst thereof. In the method, an organic matter and a tungsten salt are separately used as a carbon source and a tungsten source, and the carbon source and the tungsten source are mixed with a surfactant; and a precursor of the ordered mesoporous carbon/tungsten carbide is synthesized by a solvent-evaporation induced self-assembly method, and then the precursor is subject to high-temperature treatment in the inert atmosphere to form the ordered mesoporous carbon/tungsten carbide composite material. The ordered mesoporous carbon/tungsten carbide composite material prepared by the method has the characteristics of high degree of order, narrow aperture distribution, large specific surface area (greater than 500 m<2>/g) and the like. The invention further comprises a supported catalyst prepared by supporting active components on the ordered mesoporous carbon /tungsten carbide composite material which is prepared by the method; and because of the synergistic effect and the structure effect of the ordered mesoporous carbon/tungsten carbide composite material, the catalyst has higher methanol electro-oxidation catalytic activity than a commercial carbon platinum-ruthenium catalyst.

Description

technical field [0001] The invention relates to the field of material science, in particular to a method for preparing an ordered mesoporous carbon / tungsten carbide composite material and a loaded catalyst using the ordered mesoporous carbon / tungsten carbide composite material as a carrier. Background technique [0002] Transition metal carbides have many unique physical and chemical properties, especially tungsten carbide has high melting point, high strength and hardness, good thermal conductivity and good oxidation and corrosion resistance. The properties of tungsten carbide make it widely used in materials science. [0003] Since the catalytic similarity between tungsten carbide and platinum was first reported, the catalytic properties of tungsten carbide have attracted much attention. So far, tungsten carbide has been used as a catalyst for extensive experimental and theoretical research, which proves that its supported Group VIII noble metal has good catalytic perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J27/22B01J35/10H01M4/90H01M4/88
CPCY02E60/50
Inventor 宋树芹吴丁财符若文何超雄梁业如
Owner SUN YAT SEN UNIV
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