Preparation method of hollow porous tungsten oxide sphere

A tungsten oxide, hollow technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of low preparation efficiency, wide particle size distribution, environmental pollution, etc.

Inactive Publication Date: 2011-08-24
BEIJING UNIV OF TECH
View PDF2 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation equipment of the mechanical pulverization method is simple and the process is short, but when the powder becomes nano-scale, it is easy to agglomerate, thereby reducing its catalytic performance. At the same time, due to the small size of the nano-powder, it is difficult to recycle.
The particle size distribution of the sol-gel method is wide, which affects its application effect. At the same time, the sol-gel method adds organic matter, w

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of hollow porous tungsten oxide sphere
  • Preparation method of hollow porous tungsten oxide sphere
  • Preparation method of hollow porous tungsten oxide sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Below in conjunction with embodiment, the present invention will be further described.

[0015] Select ammonium tungstate as the tungsten source, prepare a certain concentration of aqueous solution (the specific concentration is shown in Table 1), and use the EYELA SD-1000 spray dryer produced in Tokyo, Japan to spray dry. The obtained powder has an inlet temperature of 130 ° C. The outlet temperature is 95°C, and the blast speed is 0.7m 3 / min, spray pressure 100kPa, feed rate 300ml / h, decompose in Hefei Kejing GSL-1600X tube furnace (decomposition temperature and holding time are shown in Table 1) to obtain hollow porous tungsten oxide balls, process parameters and The result is as follows:

[0016] Table 1 Process and results of preparation of hollow porous tungsten spheres by ammonium tungstate

[0017]

[0018] Select ammonium metatungstate as the tungsten source, configure an aqueous solution of a certain concentration (the specific concentration is shown in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparation method of hollow porous tungsten oxide spheres and belongs to the field of functional materials. The method comprises the following steps of: dissolving ammonium tungstate and/or ammonium metatungstate in water and stirring thoroughly to produce a solution with concentration of 1 g/L to 200 g/L; preparing hollow powder of ammonium tungstate, ammonium metatungstate or a mixture thereof by the spray drying of spray-drying equipment; and putting the powder in an electric furnace, heating up to a temperature of 400 DEG C to 1000 DEG C, and preserving heat for 15 minutes to 180 minutes to obtain hollow porous tungsten oxide spheres. The method needs simple equipment, shortens the process flow, increases the preparation efficiency and is simple and feasible for preparing porous tungsten oxide nano-spheres. The specific surface area of the hollow porous tungsten oxide spheres prepared by the method reaches 15 m<2>/g to 30 m<2>/g. The preparation method has good prospects for industrial applications.

Description

technical field [0001] The invention belongs to the technical field of manufacturing functional materials, and in particular relates to a method for preparing hollow porous tungsten oxide balls. Background technique [0002] Tungsten oxide is an n-type semiconductor material with various symmetrical structures such as hexagonal and cubic, and has attracted much attention due to its excellent electrochromic, aerochromic and photochromic properties. Especially since the photochromic phenomenon of tungsten oxide was discovered in 1973, it has shown great application prospects in information display devices, high-sensitivity optical storage materials and color-changing glasses, making its preparation, structure and photochromic properties It has become one of the research hotspots at home and abroad. Especially nano-tungsten oxide, because of its huge specific surface area, its volume effect, surface effect, quantum size effect and macroscopic quantum tunneling effect are remar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01G41/02
Inventor 王金淑刘柏雄李洪义崔云涛周美玲左铁镛
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap