Activated Alumina
Activated Alumina – High-Performance Desiccant, Adsorbent & Catalyst Carrier
What Is Activated Alumina?
Activated Alumina is a highly porous, granular form of aluminum oxide (Al₂O₃) manufactured through controlled dehydroxylation of aluminum hydroxide. This specialized manufacturing process creates a material with an extensive internal pore structure and a specific surface area typically exceeding 200 m²/g, reaching up to 380 m²/g in premium grades .
As a versatile industrial material, Activated Alumina exhibits exceptional adsorption capacity, thermal stability up to 600°C, and resistance to chemical attack. These unique properties make it indispensable across multiple industries, including petrochemical processing, natural gas dehydration, water treatment, compressed air drying, and heterogeneous catalysis.
The material is commercially available in white spherical beads ranging from 1 mm to 8 mm in diameter, offering low attrition loss (<0.6 wt%), high crush strength (80–220 N/particle), and bulk density between 0.65 and 0.80 g/ml.
Activated Alumina Desiccant – Superior Moisture Removal
One of the primary applications of Activated Alumina Desiccant is in the deep drying of gases and liquids. When employed as a desiccant, Activated Alumina Desiccant achieves dew points as low as -70°C, outperiting many molecular sieves in specific high-humidity conditions.
Why Choose Activated Alumina Desiccant?
| Parameter | Performance |
|---|---|
| Static adsorption (60% RH) | 16.8% – 21.5% |
| Dew point capability | -40°C to -70°C |
| Regeneration temperature | 175°C – 315°C |
| Cycle life | 3–5 years (typical) |
The regeneration capability of Activated Alumina Desiccant is a critical economic advantage. Unlike single-use desiccants, Activated Alumina Desiccant can be repeatedly regenerated by heating to 200–350°C to drive off absorbed moisture, restoring its original adsorption capacity with minimal degradation over hundreds of cycles.
Common industrial applications for Activated Alumina Desiccant include:
Compressed air drying systems
Natural gas dehydration (pipeline specifications)
Instrument air drying in automated manufacturing
Petrochemical crack gas drying
Refrigerant drying in HVAC applications
Activated Alumina Catalyst Carrier – Engineered for Catalytic Performance
In heterogeneous catalysis, Activated Alumina Catalyst Carrier serves as the structural foundation upon which active catalytic metals (such as platinum, palladium, cobalt, molybdenum, or nickel) are dispersed. The success of any catalytic process depends significantly on the quality and consistency of the Activated Alumina Catalyst Carrier.
Critical Properties of Activated Alumina Catalyst Carrier
The effectiveness of an Activated Alumina Catalyst Carrier is determined by four key parameters:
1. Specific Surface Area (BET)
Premium Activated Alumina Catalyst Carrier offers BET surface areas of 280–380 m²/g, providing abundant active sites for metal dispersion and catalytic reactions -2-7.
2. Pore Volume and Pore Size Distribution
With total pore volumes of 0.38–0.50 cm³/g, Activated Alumina Catalyst Carrier facilitates rapid mass transfer of reactants and products, preventing diffusion limitations that reduce catalytic efficiency -1-8.
3. Mechanical Strength
Crush strength values of 80–220 N/particle ensure that Activated Alumina Catalyst Carrier maintains structural integrity under high-pressure reactor conditions, minimizing bed compaction and pressure drop increases -6.
4. Thermal Stability
Unlike many supports that sinter or undergo phase transformations at elevated temperatures, Activated Alumina Catalyst Carrier retains its gamma-phase structure and surface area during extended operation at 400–600°C.
Activated Alumina for Fluoride Adsorption and Water Treatment
Beyond desiccant and catalyst applications, Activated Alumina is widely recognized as the industry standard for fluoride removal from drinking water. When used as an adsorbent, Activated Alumina demonstrates selective affinity for fluoride ions, achieving removal efficiencies exceeding 90% under optimal conditions (pH 5.0–6.0)
The mechanism involves both physical adsorption and surface complexation, making Activated Alumina particularly effective for:
Municipal drinking water defluoridation
Industrial wastewater treatment (semiconductor, fertilizer, aluminum smelting)
Arsenic and selenium removal
Dual-oxygen removal from boiler feed water
Technical Specifications – Activated Alumina Products
Below are typical specifications for commercial-grade Activated Alumina products across different applications:
| Parameter | Desiccant Grade | Catalyst Carrier Grade | Fluoride Removal Grade |
|---|---|---|---|
| Al₂O₃ content | ≥92% – 93.5% | ≥93% – 99.9% | ≥92% |
| Na₂O content | ≤0.3% – 0.5% | ≤0.04% – 0.3% | ≤0.4% |
| BET surface area | ≥280 – 300 m²/g | ≥300 – 380 m²/g | ≥250 m²/g |
| Pore volume | ≥0.40 cm³/g | 0.38 – 0.48 cm³/g | ≥0.40 cm³/g |
| Bulk density | 0.70 – 0.80 g/ml | 0.65 – 0.75 g/ml | 0.68 – 0.75 g/ml |
| Crush strength | 60 – 220 N/particle | 80 – 140 N/particle | 50 – 100 N/particle |
| Attrition loss | ≤0.6% | ≤0.4% | ≤1.0% |
| Available sizes | 1–3, 2–4, 3–5, 4–6, 5–7 mm | 2–4, 3–5 mm | 1–2, 2–4 mm |
Specifications sourced from industry data
Activated Alumina Regeneration and Service Life
A significant economic advantage of Activated Alumina is its regenerability. Unlike consumable adsorbents, Activated Alumina can be restored to near-original capacity through thermal or chemical regeneration.
Thermal regeneration of Activated Alumina Desiccant is accomplished by heating the saturated bed to 200–350°C with a purge gas (dry air or nitrogen) to remove adsorbed water. Each regeneration cycle may reduce capacity by 0.5–1.5%, giving commercial Activated Alumina an effective service life of 3–5 years in most applications
For Activated Alumina used in fluoride removal, chemical regeneration with 0.75–1.0% sodium hydroxide or 2–3% aluminum sulfate solution is standard practice, followed by thorough rinsing and pH neutralization
Why Source Activated Alumina from a Professional Supplier?
Selecting the right partner for Activated Alumina procurement directly impacts operational efficiency and cost. Professional Activated Alumina manufacturers provide:
Consistent quality – Certified batch-to-batch reproducibility
Technical support – Application engineering and troubleshooting
Customization – Tailored particle size, pore structure, and surface chemistry
Regulatory compliance – REACH, RoHS, and local chemical control laws
Supply security – Reliable logistics and inventory management
Conclusion
Whether your application demands Activated Alumina Desiccant for deep drying, Activated Alumina Catalyst Carrier for high-performance catalysis, or adsorbent-grade Activated Alumina for water treatment, the material’s unique combination of high surface area, controlled porosity, mechanical strength, and regenerability makes it the industry’s preferred choice.
Contact our technical team to discuss your specific Activated Alumina requirements, request samples, or receive a customized quotation based on your application parameters.
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