Activated alumina is a porous, highly dispersed solid material primarily composed of aluminum oxide, produced through a specialized process. Its rich internal pore structure and high specific surface area demonstrate excellent adsorption properties, thermal stability, and mechanical strength, making it widely used in various industrial fields. Activated alumina has a highly developed pore structure and numerous Lewis and Brønsted acid sites on its surface, resulting in a strong affinity for polar molecules and water. Furthermore, the material exhibits excellent compressive strength, wear resistance, and chemical stability, maintaining its adsorption properties even at elevated temperatures.
Adsorption Mechanism:
Activated alumina's adsorption process is primarily physical adsorption, with some chemical adsorption properties. Its adsorption capacity stems primarily from its surface polarity and porous structure, enabling it to capture highly polar substances such as water molecules, fluoride ions, and sulfur-containing compounds through intermolecular forces. During dynamic adsorption, pollutant molecules enter the pores and are fixed to the active sites, achieving separation or purification.
Main Application Areas:
Gas and Liquid Drying:
Activated alumina has a strong adsorption capacity for water molecules and is commonly used for deep dehydration of gases such as compressed air, natural gas, and refrigerants. It can also be used for drying organic solvents.
Water Purification:
In drinking water and industrial wastewater treatment, it can be used to remove harmful substances such as fluoride ions and arsenates, improving water quality.
Petrochemical Industry:
It is used as an adsorbent, catalyst, or catalyst carrier for alkane cracking and reforming reactions, as well as for the removal of impurities such as sulfur and nitrogen.
Environmental Protection:
It can be used to adsorb acid gases and other volatile organic compounds in industrial waste gases, helping to reduce environmental pollution.
Regeneration:
Activated alumina exhibits excellent regeneration properties. Adsorbed substances can be removed and restored through heating (such as hot nitrogen purging or high-temperature calcination). Careful control of temperature and atmosphere during regeneration is crucial to prevent structural sintering and performance degradation. Properly regenerated adsorbents can be reused multiple times, reducing costs and resource consumption.
During the dynamic adsorption process, pollutant molecules enter the pores and are fixed on the active sites, achieving separation or purification.During the dynamic adsorp.
