The preparation method of hollow ammonium metatungstate balls can mainly use spray drying method, the following is a detailed summary of the method of preparing hollow ammonium metatungstate balls by spray drying method according to the information in the reference article:
Spray drying method for the preparation of hollow ammonium metatungstate spheres
Principle of spray drying method
Spray drying method is through the ammonium metatungstate solution through the sprayer atomization into fine droplets, these droplets in the hot air under the action of rapid drying, and then form spherical particles. Due to the rapid evaporation of water and surface tension, cavities may be formed inside the particles, resulting in a hollow structure.
Steps of spray drying method
Preparation of ammonium metatungstate solution
First, ammonium metatungstate solution needs to be prepared, which may involve steps such as solvent extraction, ion exchange, etc., depending on the raw materials and process conditions.
Atomization
The ammonium metatungstate solution is atomized into fine droplets by a sprayer.
Drying
The atomized droplets are rapidly dried under the action of hot air to form spherical particles.
Heat Treatment
In order to obtain hollow ammonium metatungstate spheres with specific structures and properties, heat treatment may also be required, such as adjusting the heat treatment temperature and time. For example, ammonium metatungstate can be completely decomposed into WO₃ at high temperatures above 600°C, while hollow mesoporous WO₃ spheres can be obtained by holding the temperature at 700°C for 2 hours.
Precautions for spray drying method
During the spray drying process, parameters such as atomization pressure, hot air temperature and flow rate need to be controlled to ensure that the spherical particles formed have the desired hollow structure. In the heat treatment process, attention should be paid to the selection of the heat treatment temperature and time to avoid the destruction of the particle structure or the disappearance of the hollow structure caused by too high temperature.
Characteristics of Spray Drying
Spray drying method is a simple and effective method to prepare hollow ammonium metatungstate balls. By adjusting the process parameters, hollow ammonium metatungstate spheres with different hollow structures and properties can be prepared.
Spray drying method is the main method to prepare hollow ammonium metatungstate spheres, and by controlling the process parameters, hollow ammonium metatungstate spheres with ideal hollow structures and properties can be prepared. This material has potential applications in the fields of catalysis, energy storage and conversion.
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