What kinds of activated alumina

Activated alumina, also known as Activated alumina, the English name is Activated alumina. In the catalyst using alumina is usually referred to as "activated alumina, it is a kind of porous, high dispersion of solid materials, there is a lot of surface area, its microporous surface qualifications for the catalysis properties, such as adsorption, surface activity, good thermal stability, etc., so is widely used as a chemical reaction catalyst and catalyst carrier. Spherical activated alumina pressure change oil adsorbent for white spherical porous particles, activated alumina particle size uniform, smooth surface, high mechanical strength, hygroscopicity, water absorption does not expand does not crack to keep the original state, non-toxic, no smell, insoluble in water, ethanol. Activated alumina is a kind of high efficiency desiccant for deep drying in trace water, which is suitable for non-thermal regeneration plant. Alumina, commonly known as bauxite, chemical formula for Al2O3. White powder, density 3.9 ~ 4.0g/cm3, melting point 2050℃, boiling point 2980℃. It is insoluble in water and can dissolve slowly in concentrated sulfuric acid. It can be used to refine the metal aluminum, and is also a raw material for crucible, porcelain, refractory materials and artificial gemstones. Used as adsorbent, catalyst and catalyst support of alumina called "activated alumina", its porous, high dispersion and large ratio of surface and product characteristics, widely used in petrochemical, fine chemical, biological and pharmaceutical fields.

Activated alumina is generally prepared by heating and dehydration of aluminum hydroxide. Aluminum hydroxide is also known as hydrated alumina, its chemical composition is Al2O3·nH2O, usually according to the number of water containing crystal, can be divided into alumina trihydrate and alumina monohydrate. After heating and dehydration of aluminum hydroxide, γ-al2o3 can be obtained. Which is commonly known as activated alumina.