Nanometer ditungsten carbide particles, and preparation method and applications thereof

A technology of ditungsten carbide and nano-particles, which is applied in chemical instruments and methods, carbides, nanotechnology, etc., can solve the problems of cumbersome preparation methods of ditungsten carbide, uncontrollable particle sintering, and low material surface area, and achieve uniform size, The effect of simple operation and simple preparation process

Active Publication Date: 2019-12-13
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, many preparation methods to obtain phase-pure WC have been reported, however, the phase-pure WC 2 The preparation method of C is rarely reported, mainly because the pure phase W 2 The synthesis of C is more demanding, usually by combining metal precursors with gaseous carbon (such as CH 4 , C 2 h 6 Or CO) is prepared by high temperature (>700°C) reduction, uncontrollable particle sintering, resulting in a positively low surface of the material
Second, the introduction of excessive gaseous carbon precursors may also cause a large amount of coking on the catalyst surface, seriously deteriorating its catalytic performance.
Therefore W 2 The preparation method of C can only be realized in a narrow range of composition and temperature, and because the preparation method of ditungsten carbide is too cumbersome, etc., and the product has many impurities, its application is limited.

Method used

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  • Nanometer ditungsten carbide particles, and preparation method and applications thereof
  • Nanometer ditungsten carbide particles, and preparation method and applications thereof
  • Nanometer ditungsten carbide particles, and preparation method and applications thereof

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preparation example Construction

[0029] A preparation method of nanometer tungsten carbide particles of the present invention comprises the following steps:

[0030] S1. Grinding tungsten trioxide powder and urea in a mortar with a mass ratio of 1:(1~3) and uniformly mixing to obtain a mixture;

[0031] Among them, what are the requirements for grinding treatment;

[0032] S2. Put the mixture in a crucible, heat up to 600-800°C at a rate of 1-8°C / min in a low-temperature tube furnace, then keep it warm for 1-4h, and cool naturally to room temperature to obtain W 2 C nanoparticles.

[0033] The low temperature tube furnace is filled with N 2 atmosphere.

[0034] Prepared W 2 The C nanocrystals have a particle or sheet structure, and the crystals have a particle size of 30-300 nm.

[0035] In the electrochemical test, in order to detect the electrochemical catalytic performance of the nano-tungsten carbide prepared by the present invention, it is used for electrochemical evaluation. In order to detect the...

Embodiment 1

[0042] Grind urea and tungsten trioxide powder in a mortar with a mass ratio of 2:1 and mix them evenly, and transfer the mixture to a crucible; after placing the mixture in the crucible, use flowing N 2 For protection, the temperature was raised to 700°C at 1°C / min, kept for 2 hours, and then naturally cooled to room temperature to obtain a 30nm W 2 C nanoparticles. The W 2 C nanoparticles seefigure 1 Shown; and has good crystallinity, the d value and relative intensity of its diffraction peak and W 2 The d value listed in the PDF standard card (35-0776) of C is consistent with the relative strength, such as figure 1 and figure 2 shown.

Embodiment 2

[0044] Grind urea and tungsten trioxide powder in a mortar with a mass ratio of 1:1 and mix them evenly, then transfer the mixture to a crucible; after placing the mixture in the crucible, use flowing N 2 For protection, the temperature was raised to 600 °C at 2 °C / min, after 4 hours of heat preservation, and then naturally cooled to room temperature, the d value and relative intensity of the diffraction peak were the same as those of W 2 The d value listed in the PDF standard card (35~0776) of C is consistent with the relative intensity, which is W at 80nm 2 C nanoparticles.

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Abstract

The invention discloses nanometer ditungsten carbide particles, and a preparation method and applications thereof. The preparation method comprises following steps: tungsten trioxide powder and urea are ground in a mortar according to a certain mass ratio and are uniformly mixed, and then an obtained mixture is transferred into a crucible; and the nanometer ditungsten carbide particles are prepared, wherein carrying out heat treatment on a uniformly mixed powder in an inert atmosphere to obtain W2C nano particles. The method is simple in process, easy to control and capable of saving energy, the obtained nanometer ditungsten carbide particles are uniform, the crystallinity degree is high, no other impure phase is generated, and the method is suitable for large-scale production and has goodelectrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a nano-ditungsten carbide particle and a preparation method and application thereof. Background technique [0002] Tungsten carbide (W X C) It has a high melting point, good thermal conductivity and excellent strength. Not only can it be used as catalyst carrier and engineering structure material, but also can operate stably in harsh environment, such as high temperature liquid filter, high current density cathode material, ion engine of emitter electron emission device. Recently, it has attracted attention as an alternative material for noble metal electrocatalysts in electrocatalytic hydrogen evolution and hydrogen production. [0003] In the W-C system, the main phases are tungsten carbide (WC) and ditungsten carbide (W 2 C). The advantage of ditungsten carbide as a cathode catalyst is that it is not only catalytic but can replace noble metals such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/949B82Y40/00B01J27/22B01J35/02B01J35/10C25B1/02C25B11/06
CPCB01J27/22B01J35/0033B01J35/023B01J35/10B82Y40/00C01P2004/24C01P2004/62C01P2004/64C25B1/02C01B32/949C25B11/057Y02P20/10
Inventor 原晓艳黄文瑞黄圣琰沙爱明王晓飞郭守武
Owner SHAANXI UNIV OF SCI & TECH
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