Preparation method of hollow porous tungsten oxide sphere

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...

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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, which is easy to cause environmental pollution.

Gas-phase synthesis method includes gas-phase deposition method and chemical deposition method. Gas-phase synthesis method can realize the control of powder composition, appearance, size, crystal form, etc. by adjusting the process conditions such as concentration, flow rate, temperature and composition ratio. However, due to its High equipment requirements and low preparation efficiency limit its application

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