Core characteristics of activated alumina: porous structure and functional advantages

Physical structural characteristics

High specific surface area of activated alumina: up to 200-360 m²/g, providing a large number of active sites, enhancing adsorption and catalytic efficiency.

The activated alumina has developed pores: pore volume is 0.40-0.46 cm³/g, the pore size is uniformly distributed, supporting deep drying and selective adsorption.

Mechanical stability: compressive strength >50 N/particle, smooth surface, water absorption without swelling or cracking, long life.

Chemical performance advantages

Thermal stability: It is resistant to high temperatures and can maintain the structure stability during high temperature reactions.

Adsorption: It has strong adsorption capacity for pollutants such as fluoride, H₂S, SO₂, and is suitable for waste gas purification.

Catalytic activity: As a support, it can support precious metal catalysts to improve reaction efficiency.

2. Preparation method: process diversity and technical route

Aluminum hydroxide method

Process: Aluminum hydroxide solution → high temperature roasting (450-600℃) → grinding → activation → washing and drying.

Advantages: Simple process, suitable for large-scale production, and large specific surface area.

Aluminum nitrate method

Process: hydrolysis of aluminum nitrate → drying → roasting → activation.

Advantages: The raw materials are easy to obtain and are suitable for laboratory preparation.

Carbonization method

Process: CO₂ reacts with NaAlO₂→ generates γ-Al₂O₃.

Advantages: Green and environmentally friendly, combined with aluminum factory intermediates, the cost is low.