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Vanadium nitride material and preparation method and application thereof

A vanadium nitride material and technology of vanadium nitride, applied in chemical instruments and methods, nitrogen compounds, nitrogen-metal/silicon/boron binary compounds, etc., can solve uneven distribution, small specific surface area of ​​vanadium nitride, dispersion Poor properties and other problems, to achieve the effect of uniform pore size distribution, increased specific surface area, and good dispersion

Active Publication Date: 2017-07-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the obtained VN is a bulk material, which has defects such as large particle size, uneven distribution, and serious agglomeration, resulting in a small specific surface area of ​​vanadium nitride and poor dispersion, which in turn reduces the catalytic performance of the catalyst.

Method used

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  • Vanadium nitride material and preparation method and application thereof
  • Vanadium nitride material and preparation method and application thereof
  • Vanadium nitride material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Add 5wt% zinc nitrate solution dropwise to 100mmol / L ammonium metavanadate solution, control the molar ratio of V / Zn to be 3:2, stir well and then age in a water bath at 30°C for 8h to obtain the mixture ;

[0058] (2) The mixture obtained in step (1) is filtered, and the precipitate obtained is washed and dried to obtain Zn 3 (OH) 2 (V 2 o 7 )(H 2 O) 2 ;

[0059] (3) the Zn that step (2) obtains 3 (OH) 2 (V 2 o 7 )(H 2 O) 2 Put it in a tube furnace, feed ammonia gas, control the flow rate of ammonia gas to 150mL / min, raise the temperature to 650°C at a rate of 5°C / min and calcinate for 8h, and obtain vanadium nitride material after reduction and nitriding.

[0060] Carry out XRD characterization to the vanadium nitride material prepared in this embodiment, as figure 1 As shown in Figure A, the vanadium nitride material obtained in this embodiment is pure phase VN.

[0061] Carry out SEM characterization to the vanadium nitride material prepared in thi...

Embodiment 2

[0064] (1) Add 5wt% zinc chloride solution dropwise to 80mmol / L sodium metavanadate solution, control the molar ratio of V / Zn to 3:2, stir well and age in a water bath at 30°C for 6h to obtain the mixture ;

[0065] (2) The mixture obtained in step (1) is filtered, and the precipitate obtained is washed and dried to obtain Zn 3 (OH) 2 (V 2 o 7 )(H 2 O) 2 ;

[0066] (3) the Zn that step (2) obtains 3 (OH) 2 (V 2 o 7 )(H 2 O) 2Place in a tube furnace, feed a mixed gas of ammonia and nitrogen, the volume fraction of ammonia is 90%, the flow rate of the mixed gas is controlled at 150mL / min, and the temperature is raised to 700°C at a rate of 5°C / min for calcination for 12h. The vanadium nitride material is obtained after reduction and nitriding.

[0067] Carry out XRD characterization to the vanadium nitride material prepared in this embodiment, as figure 1 As shown in Figure B, the vanadium nitride material obtained in this embodiment is pure phase VN.

[0068] Car...

Embodiment 3

[0071] (1) 5wt% zinc nitrate solution was added dropwise to 100mmol / L sodium orthovanadate solution, the molar ratio of V / Zn was controlled to 3:2, after stirring evenly, aging in 30°C water bath for 8h, to obtain the mixture;

[0072] (2) The mixture obtained in step (1) is filtered, and the precipitate obtained is washed and dried to obtain Zn 3 (OH) 2 (V 2 o 7 )(H 2 O) 2 ;

[0073] (3) Zn obtained by step (2) 3 (OH) 2 (V 2 o 7 )(H 2 O) 2 Place in a tube furnace, feed a mixed gas of ammonia and argon, the volume fraction of ammonia is 85%, control the flow rate of the mixed gas to 150mL / min, and heat up to 750°C at a rate of 5°C / min for calcination for 8h , the vanadium nitride material is obtained after reduction and nitriding.

[0074] Carry out XRD characterization to the vanadium nitride material prepared in this embodiment, as figure 1 As shown in Figure C, the vanadium nitride material obtained in this embodiment is pure phase VN.

[0075] Carry out SEM c...

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Abstract

The invention relates to a vanadium nitride material. The vanadium nitride material is assembled from porous vanadium nitride nanosheets and is in a spherical structure. The spherical structure comprises hollow cavities formed by the porous vanadium nitride nanosheets through separation. A vanadate solution and a zinc salt solution are mixed according to certain proportion, Zn3(OH)2(V2O7)(H2O)2 is obtained thorough Ostwald ripening, and the vanadium nitride material is obtained after reduction and nitration. The obtained vanadium nitride material has a multi-level micro-nano structure, the pore size distribution is even and reasonable, the specific surface area is up to 18-50 m<2> / g, the vanadium nitride material is good in dispersity, and is an excellent catalyst carrier. The vanadium nitride material shows higher catalytic activity and stability when being applied to catalyzing the methanol oxidation reaction as a noble metal based catalyst carrier, and the vanadium nitride material has an excellent application prospect in the fields of low-temperature fuel cells.

Description

technical field [0001] The invention relates to the field of nanometer material preparation, in particular to a vanadium nitride material and its preparation method and application. Background technique [0002] With the development of society and the advancement of science and technology, the consumption of energy is increasing, and the waste generated after the use of fossil energy is increasingly polluting and destroying the earth's environment, posing a serious threat to human survival and development. Therefore, the development and utilization of efficient, energy-saving and environmentally friendly clean energy has become the primary task of scientific researchers. At present, the clean energy and devices that have been studied more include lithium-ion batteries, supercapacitors and low-temperature fuel cells. Among them, low-temperature fuel cells have the advantages of low operating temperature, high specific energy density, quietness, cleanness and environmental pro...

Claims

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Application Information

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IPC IPC(8): C01B21/06B01J27/24B01J35/08B01J35/10
CPCC01B21/0617B01J27/24C01P2004/32C01P2004/03C01P2002/72C01P2004/61C01P2006/12B01J35/51B01J35/613
Inventor 张红玲刘宏辉徐红彬隋智通娄太平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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