What is Alumina and How Is It Made?
Shop Alumina Online Activated Alumina is an aluminum oxide that is highly porous and exhibits tremendous surface area. Activated Alumina is resistant to thermal shock and abrasion and will not shrink, swell, soften nor disintegrate when immersed in water. Alumina oxide is an inorganic substance made by the dehydration of alumina hydroxide Al(OH)3 at high temperatures. The active sites used for separation consist of acidic alumina ions, basic oxide ions and polar Al-OH groups. The unsaturated alumina ions act as Lewis acids, and the Al-OH groups act as dipoles. The hydroxyl groups at the surface are responsible for the selective retention of adsorbed materials. Surface area are in the range of 150-350 m2/gram . Because it has a higher capacity for water than Silica Gel at elevated temperatures it has replaced silica gel as a desiccant for warm gases including air. The alumina used for chromatographic and separation applications is gamma alumina. Alumina is manufactured with 3 pH ranges