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Preparing method of mesoporous nano tungsten carbide and product

A nano-tungsten carbide and mesoporous technology, which is applied in the chemical industry, can solve problems such as difficulty in ensuring sufficient mixing and uniformity, waste of energy, and difficulty in ensuring complete reaction, and achieve uniform particle size, energy saving, and small particle size. Effect

Active Publication Date: 2017-02-22
BERIS ENG & RES CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the stage of precursor preparation, at present, it is mostly the physical mixing of carbon and tungsten sources, and it is difficult to ensure the adequacy and uniformity of the mixing. The only way to improve the degree of reaction is to increase the heat treatment temperature and prolong the holding time in the subsequent reduction carbonization process, which is wasteful. Without energy, it is difficult to guarantee the complete reaction

Method used

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  • Preparing method of mesoporous nano tungsten carbide and product
  • Preparing method of mesoporous nano tungsten carbide and product

Examples

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preparation example Construction

[0026] The preparation method of mesoporous nano tungsten carbide of the present invention specifically comprises the following steps:

[0027] (1) Add a tungsten source and a carbon source to the surfactant solution, and mix them uniformly to obtain a reaction complex, which is reacted in a water bath, and then left to evaporate to form a tungsten-carbon gel precursor.

[0028] Wherein, the molar ratio of the tungsten element in the tungsten source to the carbon element in the carbon source is 1:(1.5-4). The tungsten source is a soluble tungsten source, for example, ammonium metatungstate. The carbon source is preferably a water-soluble phenolic resin, or a polycondensate of resorcinol and formaldehyde, wherein the molar ratio of resorcinol to formaldehyde is 1: (1.1-2.5), and the molecular weight of the synthetic polycondensate is 650-850. The surfactant is a cationic surfactant, for example, cetyltrimethylammonium bromide solution, and its mass percent concentration is 10-...

Embodiment 1

[0040] Weigh 6.5g of CTBAr and dissolve it in 20ml of deionized water, stir for 30min, then add 7.5g of ammonium metatungstate, 1.5g of resorcinol, and 2ml of formaldehyde solution, put it in a water bath at 80°C for 1h, and form a gel after standing and evaporating. The gel was dried at 80°C for 24 h and then ground for 1 h to obtain the precursor powder. Put the precursor powder in the tube furnace, in VH 2 Under the reducing atmosphere of / VAr=1 / 4, the temperature was raised to 900°C at a heating rate of 8°C / min, and the mesoporous nano-tungsten carbide powder was obtained after holding for 1.5h. The XRD pattern of the mesoporous nano-tungsten carbide powder is as follows figure 1 As shown, the scanning electron microscope photo is shown as figure 2 shown.

Embodiment 2

[0042]Weigh 6.5g CTBAr and dissolve it in 30ml deionized water, stir for 30min, then add 7.5g ammonium metatungstate, 2.5g resorcinol, 3ml formaldehyde solution, put in 80℃ water bath for 1h, and form a gel after standing and evaporating. The gel was dried at 90°C for 24 hours and then ground for 2 hours to obtain the precursor powder. Put the precursor powder in the tube furnace, in VH 2 Under the reducing atmosphere of / VAr=1 / 4, the temperature was raised to 900°C at a heating rate of 8°C / min, and the mesoporous nano-tungsten carbide powder was obtained after holding for 1.5h.

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Abstract

The invention provides a preparing method of mesoporous nano tungsten carbide. The method includes the steps that a carbon source and a tungsten source are added into a surfactant solution and mixed uniformly to obtain reaction complex, and the reaction complex reacts in a water bath to generate a tungsten-carbon gel precursor; the tungsten-carbon gel precursor is dried and ground to obtain precursor powder; heat treatment is carried out on the precursor powder in the reducing atmosphere to obtain the mesoporous nano tungsten carbide powder. The invention further provides mesoporous nano tungsten carbide prepared through the method. The method is simple in process and easy to control, saves energy and does not introduce external impurities. The obtained mesoporous nano tungsten carbide is small and uniform in particle size, high in porosity and large in specific area and has good electrochemical catalysis performance.

Description

technical field [0001] The present invention belongs to the field of chemical industry, specifically, the present invention relates to a preparation method of mesoporous material, more specifically, the present invention relates to a preparation method of mesoporous nano tungsten carbide and mesoporous nano tungsten carbide obtained by the method Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is considered to be an efficient and pollution-free energy source with good development prospects, but a large number of expensive platinum (Pt) metals are used as electrode materials, which greatly increases the cost of fuel cells. limit its application prospects. Studies have shown that tungsten carbide and platinum have the same outer electronic structure, resulting in tungsten carbide having similar electrocatalytic properties to platinum. [0003] Mesoporous nano-tungsten carbide refers to a kind of porous tungsten carbide material with a pore size betwee...

Claims

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Application Information

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IPC IPC(8): C01B32/949B82Y30/00
CPCB82Y30/00C01P2002/72C01P2004/03C01P2004/64C01P2006/12
Inventor 齐德才赵祉荣
Owner BERIS ENG & RES CORP
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