Synthesis method of tungsten nitride with high catalytic performance

A technology of catalytic performance and synthesis method, applied in nitrogen-metal/silicon/boron binary compounds, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of high preparation cost and long preparation time, Achieve high reaction activity, improve catalytic performance, and increase heat treatment speed

Active Publication Date: 2015-07-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for preparing nano-tungsten nitride, which solves the problem that the preparation time is too long and the preparation cost is high

Method used

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  • Synthesis method of tungsten nitride with high catalytic performance
  • Synthesis method of tungsten nitride with high catalytic performance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.24mol, urea (CO(NH 2 ) 2 ) 0.072mol, ethylenediaminetetraacetic acid (EDTA) 0.005mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until completely dissolved, then heat at a constant temperature of 200°C, and react after the solution is evaporated to dryness to obtain the precursor tungsten oxide powder. Nitriding the precursor at 650°C in ammonia gas and keeping it warm for 2 hours to obtain tungsten nitride with a diameter of 30-80nm.

Embodiment 2

[0024] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.24mol, urea (CO(NH 2 ) 2 ) 0.072mol, ethylenediaminetetraacetic acid (EDTA) 0.005mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until completely dissolved, then heat at a constant temperature of 200°C, and react after the solution is evaporated to dryness to obtain the precursor tungsten oxide powder. Nitriding the precursor at 750°C in ammonia gas and keeping it warm for 2 hours to obtain tungsten nitride with a diameter of 30-100nm.

Embodiment 3

[0026] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.3mol, citric acid (C 6 h 8 o 7 ) 0.072mol, ethylenediaminetetraacetic acid (EDTA) 0.005mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until completely dissolved, then heat at a constant temperature of 200°C, and react after the solution is evaporated to dryness to obtain the precursor tungsten oxide foam. Nitriding the precursor at 900°C in ammonia gas and keeping it warm for 1 hour to obtain tungsten nitride with a diameter of 50-100nm.

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Abstract

The invention discloses a method for preparing nano tungsten nitride, belonging to the technical field of powder metallurgy preparation. The method comprises the following steps: synthesizing and preparing a tungsten oxide precursor through a solution method; and nitriding the tungsten oxide precursor in ammonia gas to obtain nanocrystalline tungsten nitride powder, wherein the particle size of the powder is 30-120nm. By virtue of the method disclosed by the invention, the problems that ultrafine nanocrystalline powder can be difficultly prepared by a traditional preparation method and the preparation time is long in the traditional preparation method can be solved. The tungsten nitride powder prepared by using the method disclosed by the invention is controllable in particle size, low in cost and high in utilization rate of raw material powder and has remarkable catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and particularly provides a preparation method of nanocrystalline tungsten nitride powder. Background technique [0002] The refractory metal tungsten not only has excellent performance as a single substance, but also its compounds tungsten oxide, tungsten sulfide, and tungsten nitride are also widely used. Among them, tungsten nitride is a new type of catalytic material, which has better performance than sulfide catalysts in hydrodesulfurization and hydrodenitrogenation. The hydrogenolysis of the ring has high selectivity, which can greatly reduce the hydrogen consumption in the process, and has great industrial significance. These processes traditionally use noble metals as catalysts. Thus, the desire to use nitrides instead of noble metals has driven research into the synthesis and catalysis of such catalysts. [0003] At the same time, the current research shows that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06B82Y30/00
Inventor 秦明礼陈鹏起陈铮刘烨鲁慧峰王炫力吴昊阳贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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