Activated alumina is a highly porous adsorbent created from aluminum hydroxide, boasting a surface area exceeding 200 m²/g. It effectively removes moisture, contaminants, and gases in industrial processes, specifically drying compressed air and purifying water by filtering fluoride, arsenic, and selenium. Due to its exceptional adsorption capacity and chemical stability, activated alumina is essential for industries like pharmaceuticals, electronics, food processing, and instrument air drying.
Technical Specifications of Activated Alumina Beads
Surface Area: Typically over 200 m²/g
Common Bead Sizes:
2–5 mm (1/8″) – most frequently used size for regenerative dryers
5–10 mm (1/4″) – often used as bed support layers in desiccant towers
Typical Dew Point Performance: As low as -40°F (-40°C)
Physical Form: Uniformly sized, robust beads resistant to abrasion and liquid water damage
Activated Alumina Desiccants and Their Applications
Activated alumina desiccants are a versatile form of aluminum oxide characterized by high porosity and superior adsorption properties. Specifically:
Regenerative Air Dryers: Activated alumina 2–5 mm beads reliably deliver dew points of -40°F and lower.
Water Treatment: Removes fluoride, arsenic, selenium, and other contaminants from drinking water.
Gas Purification: Efficiently adsorbs gases and vapors without softening or breaking down when exposed to moisture.
