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Product Description
Activated alumina spheres are porous, highly dispersed, white spherical granules with the chemical formula Al2O3. Composed of transitional aluminas-such as γ-Al2O3-they possess an exceptionally large specific surface area (typically ≥280 m²/g) and strong adsorption capabilities, making them widely utilized as industrial desiccants, catalyst carriers, and fluoride adsorbents.
Insoluble in both water and ethanol, these spheres are non-toxic and odorless; they neither swell nor crack upon absorbing moisture, and they exhibit high mechanical strength and excellent abrasion resistance. Capable of being regenerated through heating at temperatures ranging from 175°C to 400°C, they can be reused repeatedly and are applicable across a diverse range of fields, including petrochemicals, environmental remediation, hydrogen production, air separation, and drinking water purification.
Applications
1. Industrial Gas Drying and Purification
Activated alumina spheres possess an exceptionally strong adsorption capacity for water vapor; they can achieve a drying depth resulting in a dew point below -70°C, making them an ideal desiccant for the deep dehydration of gases such as compressed air, natural gas, hydrogen, oxygen, and carbon dioxide.
They are widely utilized in applications such as air separation units, hydrogen production systems, instrument air dryers, and petrochemical cracking gas dehydration to prevent moisture-induced equipment corrosion and maintain reaction efficiency.
2. Drinking Water and Industrial Water Defluoridation
Exhibiting highly selective adsorption capabilities for fluoride ions-with a capacity of up to 6,400 grams of fluoride adsorbed per cubic meter-they serve as a core material for defluoridating drinking water in regions with high fluoride concentrations.
They can be integrated into household defluoridation filters or municipal water treatment plants; suitable for water environments with a pH range of 5.5-6.5, the material can be continuously reused for 6-8 years following regeneration.
3. Catalysts and Catalyst Carriers
In the petrochemical industry, they function as catalysts or catalyst carriers in reactions such as hydrodesulfurization, catalytic cracking, ammonia synthesis, and alkylbenzene production, thereby enhancing reaction rates and selectivity.
Their porous structure and surface acidity provide an abundance of active sites for catalytic reactions, leading to their widespread application in fields such as petroleum refining and organic synthesis.
4. Waste Gas and Wastewater Treatment
They effectively adsorb pollutants found in waste gases-including H2S, SO2, HF, hydrocarbons, and lubricating oil vapors-and are employed in the waste gas treatment systems of chemical plants, power stations, and textile dyeing and printing facilities.
In the production of hydrogen peroxide and during hydrogen generation processes, they are utilized to remove impurities from feedstock gases, thereby ensuring product purity.
5. Other Industrial Applications
1) As an adsorbent for the dehydration and drying of organic solvents such as ethanol and methanol.
2) As an additive in monolithic (unshaped) refractory materials to enhance the density and strength of the green body, as well as to promote the formation of secondary mullite.
3) For applications such as the deacidification and regeneration of transformer oil, moisture control within shipping containers, and humidity protection for precision instruments.
performance
1. High Specific Surface Area and Abundant Pore Structure
The specific surface area typically ranges between 280-350 m²/g, and under certain preparation processes, it can exceed 600 m²/g. Its internal structure features a predominantly mesoporous, honeycomb-like morphology with a pore volume of ≥0.35 cm³/g; this provides a vast number of active adsorption sites, thereby significantly enhancing adsorption efficiency.
2. Strong Selective Adsorption Performance
It exhibits a high affinity for polar substances such as water molecules, fluoride ions, and acetic acid. It is suitable for deep drying of gases, capable of lowering the dew point to below -70°C, thereby meeting the rigorous operational demands of applications such as air separation and hydrogen production. In fluoride removal applications, one cubic meter of material can adsorb up to 6,400 grams of fluoride, making it a core material for the defluoridation of drinking water.
3. Excellent Mechanical Strength and Abrasion Resistance
It possesses a compressive strength of ≥100 N/particle (for a particle size of 3-5 mm) and an abrasion rate of ≤0.5%. Its structure remains stable in environments involving high-pressure gas flows or frequent pressure switching; it resists pulverization and cracking, thereby ensuring the long-term operational safety of the system.
4. Good Thermal Stability and Regenerability
It can be regenerated via thermal desorption at temperatures ranging from 175°C to 400°C, recovering over 90% of its adsorption capacity. This allows for dozens of adsorption-desorption cycles, significantly reducing operating costs. However, it is important to note that the desorption temperature should not be excessively high, to prevent the transformation of γ-Al2O3 into α-Al2O3, which would lead to the collapse of the pore structure.
5. Good Chemical Stability
It is insoluble in water and most organic solvents, and it exhibits resistance to acid and alkali corrosion. Consequently, it is suitable for use in complex chemical environments, such as in the treatment of sulfur-containing or fluorine-containing waste gases.
