Method for producing tungsten trioxide powder for photocatalyst, tungsten trioxide powder for photocatalyst, and photocatalyst product

一种光催化剂、三氧化钨的技术，应用在氧化钨/氢氧化钨、催化剂活化/制备、化学仪器和方法等方向，能够解决制造效率低等问题，达到粒径分布窄、优异光催化性能的效果

Active Publication Date: 2010-02-03
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacturing efficiency is low because 20 hours or more of kneading is required to stabilize the BET specific surface area

Method used

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  • Method for producing tungsten trioxide powder for photocatalyst, tungsten trioxide powder for photocatalyst, and photocatalyst product
  • Method for producing tungsten trioxide powder for photocatalyst, tungsten trioxide powder for photocatalyst, and photocatalyst product
  • Method for producing tungsten trioxide powder for photocatalyst, tungsten trioxide powder for photocatalyst, and photocatalyst product

Examples

Experimental program
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Effect test

Embodiment 1

[0089] Tungsten trioxide powder having an average particle diameter of 0.5 μm was prepared as a raw material powder. In the sublimation step, while using the atmosphere (air) as a carrier gas, the raw material powder was sprayed into RF plasma and the average flow velocity was adjusted to 1 m / s, and the raw material powder was sublimated while undergoing an oxidation reaction. Tungsten trioxide powder is thus obtained by the sublimation step.

[0090] Then, the obtained tungsten trioxide powder was subjected to a heat treatment step of 530° C.×1 hour in an air atmosphere. Thereby obtaining tungsten trioxide powder for photocatalyst.

[0091] For the obtained tungsten trioxide powder for photocatalyst, the BET specific surface area, particle size distribution and crystal phase were measured. As for the particle size distribution parameter, a (D90-D10) / D50 value calculated from D90, D50, and D10 obtained by calculating the cumulative diameter of 150 or more crystal grains obta...

Embodiment 2

[0094] Tungsten metal powder having an average particle diameter of 1 μm was prepared as a raw material powder. In the sublimation step, while using the atmosphere (air) as a carrier gas, the raw material powder was sprayed into RF plasma and the average flow velocity was adjusted to 2 m / s, and the raw material powder was sublimated while undergoing an oxidation reaction. Tungsten trioxide powder is thus obtained by the sublimation step.

[0095] Then, the obtained tungsten trioxide powder was subjected to a heat treatment step of 600° C.×2 hours in an air atmosphere. Thereby obtaining tungsten trioxide powder for photocatalyst.

[0096] To the obtained tungsten trioxide powder for photocatalyst, carry out and embodiment 1 described identical measurement, and obtain following result: BET specific surface area is 14m 2 / g, the particle size distribution (D90-D10) / D50 is 0.93. Furthermore, it was found that the crystal phases consisted only of monoclinic crystals, orthorhombi...

Embodiment 3

[0098] Tungsten metal powder having an average particle diameter of 2 μm was prepared as a raw material powder. In the sublimation step, the raw material powder was mixed with water to prepare a dispersion liquid, which was sprayed into RF plasma while using the atmosphere (air) as a carrier gas, and the average flow velocity was adjusted to 0.5 m / s. The raw material powder is sublimated while undergoing an oxidation reaction, and tungsten trioxide powder is obtained through the sublimation step.

[0099] Then, the obtained tungsten trioxide powder was subjected to a heat treatment step at 550° C. for 30 minutes in an air atmosphere. Thereby obtaining tungsten trioxide powder for photocatalyst.

[0100] To the obtained tungsten trioxide powder for photocatalyst, carry out and embodiment 1 described identical measurement, and obtain following result: BET specific surface area is 68m 2 / g, the particle size distribution (D90-D10) / D50 is 0.88. Furthermore, it was found that th...

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Abstract

Disclosed is a method for producing a tungsten trioxide powder for photocatalysts, which is characterized by comprising a sublimation step wherein a tungsten trioxide powder is obtained by subliming atungsten metal powder or a tungsten compound powder by inductively coupled plasma processing in an oxygen atmosphere, and a heat treatment step wherein the tungsten trioxide powder obtained in the sublimation step is heated at 300-1000 DEG C for 10 minutes to 2 hours in an oxidizing atmosphere. A tungsten trioxide powder obtained by such a method for producing a tungsten trioxide powder for photocatalysts has high photocatalytic activity under visible light.

Description

technical field [0001] The invention relates to a method for producing visible light photocatalyst materials, photocatalyst materials and photocatalyst products, in particular to a method for producing tungsten trioxide powder for photocatalysts, tungsten trioxide powder for photocatalysts and photocatalyst products. Background technique [0002] Currently, titanium dioxide is often used as a photocatalyst material for purposes such as antifouling and deodorization. In addition, photocatalyst materials are used in various fields including building materials for outdoor use, building materials for indoor use, and materials for home appliances such as lighting equipment, refrigerators, air conditioners, and toilet equipment. However, since titanium dioxide is excited in the ultraviolet region, sufficient photocatalytic performance cannot be obtained in indoor fields receiving a small amount of ultraviolet light. [0003] Therefore, research and development of photocatalysts h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B01J35/02A61L9/00B01J37/08A61L9/01B01J37/14B01D7/00B01J37/34B01J23/30
CPCC01P2006/12B01J35/1014B01J35/006C01G41/02B01J35/002B01J35/1009B01J35/023C01P2004/64B01J37/349B01J35/1019B01J23/30B01J35/004B01J35/1023C01P2004/51B01J37/0238B82Y30/00Y10T428/2982B01J35/393B01J35/30B01J35/39B01J35/40B01J35/612B01J35/617B01J35/613B01J35/615
Inventor 佐藤光中野佳代白川康博
Owner KK TOSHIBA
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