Activated alumina, also known as activated bauxite, is called Activated alumina in English. The use of alumina in the catalyst is usually called "active alumina". It is a porous, high dispersion solid material with a large surface area. Its microporous surface has the properties required by catalysis, such as adsorption, surface activity, excellent thermal stability and so on, so it is widely used as a chemical reaction. The catalyst and catalyst carrier should be used. The spherical activated alumina pressure oil adsorbent is a white spherical porous particle. The active alumina has a uniform particle size, smooth surface, high mechanical strength, strong hygroscopicity, and it does not expand after water absorption. It is nontoxic, odorless, insoluble in water and ethanol. Activated alumina is a kind of high efficiency desiccant for trace water deep drying. It is suitable for non thermal regeneration device.
Alumina, commonly known as bauxite, chemical formula is Al2O3. White powder, density 3.9 ~ 4.0g/cm3, melting point 2050 degrees, boiling point 2980 degrees Celsius. It is insoluble in water and can dissolve slowly in concentrated sulfuric acid. It can be used to refine metal aluminum, and is also the raw material for making crucible, porcelain, refractory and artificial gemstones. Alumina, which is used as adsorbent, catalyst and catalyst carrier, is called "active alumina". It has the characteristics of porous, high dispersion and large specific surface and product. It is widely used in the fields of petrochemical, fine chemical, biological and pharmaceutical.
Activated alumina is usually made by heating and dehydrating aluminum hydroxide. Aluminum hydroxide, also known as hydrated alumina, has a chemical composition of Al2O3. NH2O, which is usually divided into three hydrated alumina and one water alumina according to the number of crystalline water contained. After heating and dehydration of aluminum hydroxide, gamma -Al2O3 can be obtained. That is, the usual activated alumina.