Activated Alumina, as a high-performance adsorbent, has shown outstanding value in chemical, environmental protection, energy and other fields.

1. Technical characteristics: porous structure and functional adaptability

High-quality activated alumina has bimodal pore distribution (large pore volume + mesoporous channel), and its key indicators are far beyond those of ordinary adsorbent materials:

Specific surface area: 300-600m²/g (5-10 times that of ordinary alumina), nano-scale micropores provide massive adsorption sites;

Pore capacity: 0.4-0.8cm³/g, supports rapid mass transfer, and improves adsorption efficiency by 40%;

Mechanical strength: compressive strength of spherical particles > 120N/particle, wear resistance > 1000 times;

Thermal stability: withstands high temperature of 800℃ and does not collapse, suitable for high-temperature gas drying;

Chemical stability: Resistant to acid and alkali corrosion (pH range 3-12), suitable for complex working conditions.

2. Preparation process: Precisely regulate pore structure

The preparation of high-quality activated alumina requires combining nanomaterial engineering and chemical thermodynamics:

Sol-gel method:

Aluminum salt (AlCl₃ or Al(NO₃)₃) is used as raw material, and polyvinyl alcohol (PVA) is added as a dispersant to form a uniform sol through pH regulation;

After supercritical drying (avoiding channel collapse), a mesoporous material with a specific surface area of ​​>500m²/g was obtained, and the adsorption rate was increased by 35%.

Template agent pore making technology:

Polymethyl methacrylate (PMMA) microspheres were added as hard templates, and ordered macropores (pore size 50-200nm) were formed after calcination;

Combined with soft template agents (such as cetyltrimethylammonium bromide, CTAB) to regulate mesoporous (2-50nm) distribution to achieve a graded pore structure.

Industrialization optimization:

A continuous spray drying tower is used to control the feeding speed (5-10mL/min) and hot air temperature (350-400℃) to produce spherical particles with uniform particle size (Φ3-8mm) in batches.

3. Application scenarios: Cross-domain value mining

New energy field

Lithium battery separator coating: high-purity alumina (above 4N) is used as a ceramic coating material to improve the heat resistance of the separator (without shrinkage of 400℃) and ensure battery safety;

Hydrogen fuel cell: Modified alumina support is supported by platinum catalyst to improve the efficiency of hydrogen oxidation reaction.

Environmental protection engineering

Flue gas desulfurization: γ-Al₂O₃ supported metal oxides (such as CuO/Al₂O₃), achieving SO₂ catalytic oxidation (conversion rate >95%);

Wastewater treatment: Nanoalumina composite membrane (pore size <2nm) retains heavy metal ions (Pb²⁺, Cr⁶⁺), and the treatment efficiency reaches 99.8%.

Pharmaceutical Industry

Drug drying: In a vacuum belt dryer, the moisture adsorption rate of activated alumina is three times that of ordinary desiccant;

Vaccine carrier: mesoporous alumina is loaded with antigen proteins to improve the intensity of immune response.