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Method for preparing vanadium trioxide nanosphere

The technology of vanadium trioxide nanometer and vanadium pentoxide is applied in the field of preparation of vanadium trioxide nanospheres, which can solve the problems of high cost of reduction equipment, long reaction time, high temperature and high pressure, etc. The effect of high product yield and uniform size

Active Publication Date: 2015-05-20
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is: the reduction time is as long as 10-20 hours
[0012] Japanese patent application 84 / 61141622 discloses the use of high-valent vanadium oxides in an ammonia atmosphere at 0.1 to 1.5 atmospheric pressure at 450 to 650°C for 1 to 6 hours to produce vanadium trioxide. The disadvantages of the method are: High temperature and high pressure, long reaction time, high cost of reduction equipment
Disclosed is a method for producing vanadium trioxide by reducing vanadium pentoxide or ammonium vanadate with reducing gases such as hydrogen. The disadvantage is that the process is complicated and a binder needs to be added.

Method used

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  • Method for preparing vanadium trioxide nanosphere
  • Method for preparing vanadium trioxide nanosphere
  • Method for preparing vanadium trioxide nanosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1g V 2 o 5 Mix it with 3.52g of sulfur powder and grind it with a mortar for 20 minutes, put the ground powder into a porcelain boat, and push the porcelain boat into the central hot zone of the tube furnace; raise the tube furnace at a rate of 10°C / min As high as 850°C, feed nitrogen into the tube furnace at the same time; keep the tube furnace at 850°C for 2 hours; then after the tube furnace is naturally cooled to room temperature, remove the flanges at both ends of the tube furnace and take out the porcelain boat , to obtain black powder, that is, vanadium trioxide nanospheres.

Embodiment 2

[0030] 1g V 2 o 5 Mix it with 5.27g of sulfur powder and grind it with a mortar for 30 minutes, put the ground powder into a porcelain boat, and push the porcelain boat into the central hot zone of the tube furnace; raise the tube furnace at a rate of 7°C / min The temperature was as high as 850°C, and nitrogen gas was introduced into the tube furnace at the same time; the tube furnace was kept at 850°C for 2 hours; and then the tube furnace was naturally cooled to room temperature to obtain black powder, that is, vanadium trioxide nanospheres.

Embodiment 3

[0032] 1 g V 2 o 5 After mixing with 7.03g of sulfur powder, grind it with a mortar for 15 minutes, put the ground powder into a porcelain boat, and push the porcelain boat into the central hot zone of the tube furnace; raise the temperature of the tube furnace at a rate of 10°C / min To 900°C, nitrogen gas was introduced into the tube furnace at the same time; the tube furnace was kept at 870°C for 1 hour; and then the tube furnace was naturally cooled to room temperature to obtain black powder, that is, vanadium trioxide nanospheres.

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Abstract

The invention discloses a method for preparing vanadium trioxide nanosphere. The method adopts a high-temperature solid-phase synthesis method, and comprises the following steps: firstly, mixing sulfur powder with vanadium pentoxide powder, wherein the mole ratio of sulfur to vanadium pentoxide is (20:1)-(40:1); grinding the mixed powder for 15-30 minutes and uniformly mixing up; subsequently putting the ground powder into a ceramic tile, pushing the ceramic tile to the central position of a tubular furnace; then raising the temperature of the tubular furnace to be 800-900 DEG C in a velocity of 7-10 DEG C / min with the presence of an inert gas, subsequently treating for 60-120 minutes at the constant temperature of 800-900 DEG C, finally standing and cooling to the room temperature so as to obtain the vanadium trioxide nanosphere. As the sulfur powder is used as a reducing agent, the method is low in cost, the production process is simple and easy to control, and the prepared nanosphere is uniform in size, high in product yield and applicable to large-scale industrial production.

Description

technical field [0001] The present invention relates to inorganic material vanadium trioxide (V 2 o 3 ), specifically relates to a method for preparing vanadium trioxide nanospheres. Background technique [0002] Vanadium trioxide is black powder at room temperature, and when the temperature reaches 730°C, the amorphous vanadium trioxide can be transformed into vanadium trioxide crystal. Vanadium trioxide crystals have two temperature-dependent phase transitions. A first-order phase transition from low-temperature antiferromagnetic insulating phase (AFI) to high-temperature paramagnetic metallic phase (PM) occurs at about -113°C, and the resistivity change shows NTC characteristics, and the single crystal resistivity mutation reaches 7 orders of magnitude. A secondary phase transition from a low temperature paramagnetic metallic phase (PM) to a high temperature paramagnetic metallic phase (PM') occurs in the range of about 77°C to 267°C. The resistivity exhibits a positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y40/00
Inventor 张向华叶霞薛亚平唐华李长生
Owner JIANGSU UNIV OF TECH