What is activated alumina?

Activated alumina, also known as activated bauxite, is a porous and highly dispersed solid material widely used in industrial fields.

Basic Information

The chemical formula of activated alumina is Al₂O₃. It is generally white powder or white spherical porous particles with a density of 3.9-4.0 g/cm³, a melting point of 2050℃, and a boiling point of 2980℃. It is insoluble in water and ethanol.

Performance Characteristics

Large Specific Surface Area: Features a well-developed pore structure with a specific surface area of 200-400 m²/g, providing abundant active sites for adsorption and catalytic reactions.

Strong Adsorption Capacity: Exhibits high adsorption capacity for water vapor, gases, and organic compounds. The water vapor adsorption capacity can reach 20%-30% (by weight) with a dew point as low as -70℃, making it the preferred material for deep drying of compressed air and other gases.

Excellent Thermal Stability: Maintains structural stability at high temperatures below 800℃ with a low thermal expansion coefficient, suitable for high-temperature catalytic or regeneration processes.

High Chemical Stability: Chemically stable in the pH range of 4-9, resistant to acid and alkali corrosion, and tolerant to toxic substances such as sulfides and chlorides. It has no risk of heavy metal leaching and complies with environmental protection standards.

High Mechanical Strength: Spherical particles have a smooth surface and high mechanical strength, maintaining their original shape without swelling or cracking after water absorption. This facilitates reactor filling and reduces pressure drop.

For more information on activated alumina, please visit www.carbon-cms.com.