Activated Alumina
Activated Alumina, also known as activated alumina, is a porous, high-dispersion solid material with great surface area and unique physical and chemical properties. It is widely used in adsorption, catalysis, environmental protection, medicine and other fields.
1. Definition and Properties of Activated Alumina
Definition of activated alumina
Activated alumina is a special form of alumina (Al₂O₃). It forms a porous structure after activation through a specific process, and has extremely strong adsorption properties and catalytic activity. Its chemical formula is Al₂O₃·xH₂O (0<x<0.8), which belongs to the category of chemical alumina.
Physical properties of activated alumina
Appearance: White spherical porous particles, uniform particle size and smooth surface.
Mechanical strength: high, 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, resistant to high temperature (can withstand high temperatures above 1200℃).
Chemical properties of activated alumina
Adsorption: The specific surface area of activated alumina is large (up to 360-600 m²/g), and has a strong adsorption capacity to impurities in gases and liquids (such as water, fluoride, sulfide).
Catalytic activity: The surface has acidic sites, which can be used as a catalyst or catalyst carrier to promote reactions such as hydrocracking of petroleum and automobile exhaust purification.
Thermal stability: activated alumina can maintain its structural stability at high temperatures and is suitable for harsh reaction conditions.
2. Activated alumina application field
Adsorption field
Gas drying: activated alumina is used to dry more than 20 kinds of gases such as acetylene, hydrogen, oxygen, and air. The dew point can be as low as -40℃ to -55℃.
Liquid drying: activated alumina is suitable for deep dehydration of liquids such as aromatic hydrocarbons, polymer olefins, gasoline, kerosene, etc.
Water quality purification: activated alumina removes fluoride (large fluoride removal capacity), arsenic, heavy metal ions and industrial wastewater in drinking water.
Catalytic field
Petrochemical: activated alumina is used as a catalyst support for hydrocracking, hydrorefining, dehydrogenation reaction, etc.
Environmental protection field: automotive exhaust purification (catalytic converters), volatile organic compounds (VOCs) management.
New energy: lithium battery separator coating, fuel cell catalyst carrier.
Pharmaceutical field
Blood purification: Adsorb toxins such as bilirubin and urea in the blood.
Drug carrier: controls drug release rate and improves targeting.
Other applications
Refractory materials: activated alumina optimizes particle size distribution and improves the corrosion resistance and mechanical strength of refractory materials.
Activated Alumina, also known as activated alumina, is a porous, high-dispersion solid material with great surface area and unique physical and chemical properties. It is widely used in adsorption, catalysis, environmental protection, medicine and other fields.
1. Definition and Properties of Activated Alumina
Definition of activated alumina
Activated alumina is a special form of alumina (Al₂O₃). It forms a porous structure after activation through a specific process, and has extremely strong adsorption properties and catalytic activity. Its chemical formula is Al₂O₃·xH₂O (0<x<0.8), which belongs to the category of chemical alumina.
Physical properties of activated alumina
Appearance: White spherical porous particles, uniform particle size and smooth surface.
Mechanical strength: high, 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, resistant to high temperature (can withstand high temperatures above 1200℃).
Chemical properties of activated alumina
Adsorption: The specific surface area of activated alumina is large (up to 360-600 m²/g), and has a strong adsorption capacity to impurities in gases and liquids (such as water, fluoride, sulfide).
Catalytic activity: The surface has acidic sites, which can be used as a catalyst or catalyst carrier to promote reactions such as hydrocracking of petroleum and automobile exhaust purification.
Thermal stability: activated alumina can maintain its structural stability at high temperatures and is suitable for harsh reaction conditions.
2. Activated alumina application field
Adsorption field
Gas drying: activated alumina is used to dry more than 20 kinds of gases such as acetylene, hydrogen, oxygen, and air. The dew point can be as low as -40℃ to -55℃.
Liquid drying: activated alumina is suitable for deep dehydration of liquids such as aromatic hydrocarbons, polymer olefins, gasoline, kerosene, etc.
Water quality purification: activated alumina removes fluoride (large fluoride removal capacity), arsenic, heavy metal ions and industrial wastewater in drinking water.
Catalytic field
Petrochemical: activated alumina is used as a catalyst support for hydrocracking, hydrorefining, dehydrogenation reaction, etc.
Environmental protection field: automotive exhaust purification (catalytic converters), volatile organic compounds (VOCs) management.
New energy: lithium battery separator coating, fuel cell catalyst carrier.
Pharmaceutical field
Blood purification: Adsorb toxins such as bilirubin and urea in the blood.
Drug carrier: controls drug release rate and improves targeting.
Other applications
Refractory materials: activated alumina optimizes particle size distribution and improves the corrosion resistance and mechanical strength of refractory materials.
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