Activated Alumina, also known as active alumina, is a porous, high-dispersion solid material with great surface area and unique physicochemical properties. The following is a detailed summary of its main properties:

1. Physical properties

Appearance and shape

The activated alumina is a white spherical porous particle with uniform particle size and smooth surface.

Mechanical strength

It has high mechanical strength, good wear resistance, strong hygroscopicity, does not swell or crack after absorbing water, and remains in its original state.

stability

Non-toxic, odorless, insoluble in water and ethanol, can remain stable at high temperatures (up to 1200℃ or above), and is resistant to acid and alkali corrosion.

2. Chemical properties

Adsorption performance

Large specific surface area: up to 360-600 m²/g, providing a large number of adsorption sites.

Adsorption types: include physical adsorption (reversible, fast speed) and chemosorption (involving electron transfer or chemical bond formation).

Adsorption object: It has strong adsorption ability to impurities (such as fluoride, sulfide) in gases (such as water vapor, acetylene, hydrogen) and liquids (such as ethanol, methanol).

Catalytic activity

Surface acidic sites: can be used as catalysts or catalyst carriers to promote reactions such as petroleum hydrocracking and automobile exhaust purification.

Catalytic performance regulation: By adjusting preparation conditions (such as calcining temperature, pore structure), its catalytic activity can be controlled.

Thermal stability

It can still maintain good catalytic activity and structural stability at high temperatures and is not easy to deactivate.

3. Special properties

Hygroscopicity

It has a strong affinity for water vapor and is suitable for deep drying of gases and liquids (such as air, hydrogen, oxygen, ethanol, etc.).

Non-swelling or cracking

After absorbing water, the shape remains stable, without expansion or cracking, ensuring long-term use performance.

Regenerative

After adsorption, it can be regenerated by heating (175-315℃) or chemical methods (such as soaking in aluminum sulfate solution), restoring activity and recycling.

4. Application fields

Adsorption fields: gas drying, liquid dehydration, water quality purification (fluorine removal, arsenic removal), industrial wastewater removal and deodorization.

Catalytic fields: petrochemical (hydrocracking, dehydrogenation reaction), environmental protection management (catalytic oxidation, denitrification), and pharmaceutical synthesis.

Other fields: refractory materials (improving corrosion resistance), battery materials (lithium battery separator coating), chromatographic analysis (stationary phase).

Summarize

Activated alumina has become an indispensable and important material in the fields of industry, environmental protection and medicine with its unique physical, chemical and special properties. Its high specific surface area, strong adsorption, catalytic activity and thermal stability make it play a key role in adsorption, catalysis, purification and other processes. At the same time, its good regeneration performance also reduces the cost of use and improves economic benefits.