Activated alumina is a highly porous material made from aluminium oxide (Al2O3). Activated alumina beads are used as a dynamic gas drying media for the purification of gas or air.
Activated alumina as a desiccant, will work by adsorption. The water molecules in the gas or air will be attracted by polar preferences into the alumina, as the air passes across it. The water molecules become trapped within the structure of the alumina & require either heat or pressure swing to be released.
Activated alumina has large surface area of 200m2/g which allows for a high adsorption capacity of water vapour molecules. The beads have a high, mechanical/crush strength and do not change form or breakdown after repeated adsorption & regeneration cycles.