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Method for preparing nano tungsten trioxide powder

A nano-tungsten trioxide and powder technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of environmental pollution, difficult control of PH value, damage to equipment, etc.

Inactive Publication Date: 2009-03-11
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] 1. The ammonium salt is easy to decompose. During the heating process, the ammonium salt decomposes and easily produces NH 3 , SO 2 2. The strong acids in the reaction process are all volatile acids, which pollute the environmental equipment and are very harmful to the human body
3. The pH value of the reaction process is not easy to control, and it has high requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of raw materials:

[0032] Ammonia water (13.4mol / L) and deionized water are mixed at a ratio of 1:1 to form the required ammonia solution.

[0033] (2) Preparation of sol:

[0034] Dissolve 4.9972g (0.02mol) of tungstic acid in 72ml of the prepared ammonia solution, add citric acid (8.416g) with a molar ratio of tungstic acid of 2:1 into the dissolved tungstic acid solution, and place it on a magnetic heating stirrer, Heat and stir in a water bath at 85°C for 8-12 hours to obtain a slightly yellowish transparent sol.

[0035] (3) Gel drying treatment:

[0036] The prepared gel was dried in an infrared oven to obtain a brown swollen gel.

[0037] (4) calcining to obtain tungsten trioxide powder:

[0038]Put the gel in a corundum crucible and calcinate it in a box furnace at 550°C for about two hours to obtain yellow nano-tungsten trioxide powder. The obtained nanoparticles are spherical, and the particle diameter is between 30-50nm.

Embodiment 2

[0040] (1) Preparation of raw materials:

[0041] Ammonia water (14mol / L) and deionized water are mixed at a ratio of 1:1 to form the required ammonia solution.

[0042] (2) Preparation of sol:

[0043] Dissolve 4.9972g (0.02mol) of tungstic acid in 72ml of prepared ammonia solution, add citric acid (16.832g) with a tungstic acid molar ratio of 4:1 into the dissolved tungstic acid solution, and place it on a magnetic heating stirrer, Heat and stir in a water bath at 85°C for 8-12 hours to obtain a slightly yellowish transparent sol.

[0044] (3) Gel drying treatment:

[0045] The prepared gel was dried in an infrared oven to obtain a brown swollen gel.

[0046] (4) calcining to obtain tungsten trioxide powder:

[0047] Put the gel in a corundum crucible and calcinate it in a box furnace at 550°C for about two hours to obtain yellow nano-tungsten trioxide powder. The obtained nanometer particle is spherical, the particle size is between 20nm and 40nm, and the particle dist...

Embodiment 3

[0049] (1) Preparation of raw materials:

[0050] Ammonia water (14mol / L) and deionized water are mixed at a ratio of 1:1 to form the required ammonia solution.

[0051] (2) Preparation of sol:

[0052] Dissolve 4.9972g (0.02mol) of tungstic acid in 72ml of prepared ammonia solution, add citric acid (16.832g) with a molar ratio of tungstic acid of 4:1 into the dissolved tungstic acid solution, and place it on a magnetic heating stirrer , heated and stirred in a water bath at 85°C for 8-12 hours to obtain a yellowish transparent sol.

[0053] (3) Gel drying treatment:

[0054] The prepared gel was dried in an infrared oven to obtain a brown swollen gel.

[0055] (4) calcining to obtain tungsten trioxide powder:

[0056] Put the gel in a corundum crucible and calcinate it in a box furnace at 650°C for about two hours to obtain yellow nano-tungsten trioxide powder. The obtained nanometer particle is spherical, the particle size is between 40nm and 60nm, and the particle dist...

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Abstract

The invention discloses a method for preparing nanometer tungstic oxide nanopowder. The method for producing the high-quality nanometer WO3 powder with high efficiency comprises the following steps: according to the rate of 1 to 1, 13.4 to15mol / L of ammonia and deionized water are prepared into the needed ammonia solution; tungstenic acid is dissolved into the prepared ammonia solution; citric acid which has the molar ratio with the tungstenic acid by 2 to 4 times is added into the solution, is heated at the temperature of between 80 and 90 DEG C and is stirred for 8 to 12 hours to obtain a yellowish transparent gel; the prepared gel is positioned in an infrared oven for roasting till brown expanded gel is obtained; and the gel obtained by the steps is calcined in a chamber furnace at the temperature of between 550 and 650 DEG C to obtain yellow nanometer tungstic oxide powder. Compared with the prior art, the method has the advantages of simple and feasible process,, less environmental pollution, less erosion to equipment and relatively low production cost.

Description

technical field [0001] The invention belongs to the technical field of tungsten trioxide powder preparation, and in particular provides a nano-tungsten trioxide (WO 3 ) powder preparation method to achieve high-quality and efficient production of nano-tungsten trioxide. Background technique [0002] Nano WO 3 Powder is an important industrial raw material, which can be used to prepare nano-tungsten powder and nano-tungsten carbide powder. In addition, nano-WO 3 It has a strong absorption capacity for electromagnetic waves, and can be used as an excellent absorbing material in the use of solar energy, and can be used as an important invisible material in the military. Nano WO 3 It has a huge specific surface area and significant surface effect, making it a good catalyst; as a transition metal compound, nano-WO 3 It also has semiconductor properties and is a very potential sensitive material for H 2 S, NH 3 And many other gases are sensitive. [0003] Currently common pr...

Claims

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Application Information

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IPC IPC(8): C01G41/02
Inventor 郭娜王豫羊新胜刘旭李统业张英李德柱董亮赵勇
Owner SOUTHWEST JIAOTONG UNIV
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