Activated Alumina & Catalyst Supports
Activated Alumina & Catalyst Supports for Industrial Adsorption and Catalysis
In the fields of heterogeneous catalysis, gas purification, fluoride removal, and water treatment, few materials offer the combination of high surface area, thermal stability, and cost-effectiveness found in activated alumina. This porous form of aluminum oxide (Al₂O₃) is produced by controlled dehydration of aluminum hydroxides, resulting in a transition phase—predominantly gamma alumina—with exceptional textural properties. As a catalyst support, activated alumina provides a high-surface-area substrate for dispersing active metals (Pt, Pd, Co, Mo, Ni) in hydrotreating, reforming, and Claus catalysis. In its own right as an alumina carrier, it mechanically stabilizes catalytic components while contributing minimal side reactions. Additionally, activated alumina serves as a highly effective alumina adsorbent for removing fluoride from drinking water, drying compressed air, and purifying hydrocarbon liquids. Specifically, gamma alumina is the preferred phase for most adsorptive and catalytic applications due to its high specific surface area (150–350 m²/g), controlled pore volume, and excellent resistance to thermal shock. Without reliable activated alumina products, refineries, water treatment plants, and air drying systems would face higher costs and lower efficiency. This page details our catalyst support, gamma alumina, alumina carrier, and alumina adsorbent offerings.
Our company manufactures premium activated alumina in various grades for catalyst, adsorption, and drying applications. We provide catalyst support materials with tailored pore size distributions (8–15 nm for HDS, 15–30 nm for resid processing) and high crush strength. Our gamma alumina is available as powder, beads, extrudates, and trilobes. As an alumina carrier, we supply custom shapes (spheres, rings, extrudates) with controlled acidity and minimal sodium content. For purification, our alumina adsorbent grades remove fluoride, arsenic, selenium, and moisture from water and gases. With consistent quality, competitive pricing, and global logistics, our activated alumina products are trusted by catalyst manufacturers, engineering firms, and industrial gas suppliers worldwide.
What Is Activated Alumina?
Activated alumina is a highly porous, partially dehydrated form of aluminum oxide with the general formula Al₂O₃, typically existing in one of several transition phases (gamma, chi, rho) rather than stable alpha-alumina (corundum). The most common and industrially significant phase is gamma alumina, which has a defect spinel structure providing a large specific surface area (150–350 m²/g) and a high density of surface hydroxyl groups. As a catalyst support, activated alumina offers a robust platform for depositing catalytic metals via impregnation or ion exchange. Its amphoteric surface chemistry allows it to function as both an acid and base catalyst in some reactions.
When used as an alumina carrier, activated alumina provides mechanical strength and attrition resistance in fixed-bed, moving-bed, or fluidized-bed reactors. The alumina adsorbent function exploits its affinity for polar molecules (water, fluoride, hydrogen sulfide, carbon dioxide) and anions in aqueous solution. Gamma alumina is metastable; it converts to alpha-alumina upon heating above 1100°C, losing surface area but gaining density and hardness. For most industrial applications, activated alumina is used in its transition form, with gamma alumina being the most prevalent.
Key Features of Activated Alumina
High Specific Surface Area and Pore Volume
Premium activated alumina offers BET surface areas from 150 to 350 m²/g ( gamma alumina grades) and pore volumes from 0.3 to 1.0 cm³/g. As a catalyst support, this high surface area allows metal dispersion above 30% for precious metals. Alumina carrier products with bimodal pore distribution (micropores + mesopores) improve mass transfer. For alumina adsorbent applications, high surface area translates to high adsorption capacity (e.g., 6–10 wt% water at 60% RH).
Controlled Pore Size Distribution
Activated alumina can be synthesized with narrow pore size ranges. Gamma alumina supports for hydrodesulfurization (HDS) typically have 8–12 nm pores to balance metal dispersion and diffusion. Catalyst support for resid processing requires larger pores (>20 nm) to accommodate bulky asphaltene molecules. Our alumina carrier products are available with average pore diameters from 5 nm to 30 nm. Alumina adsorbent for fluoride removal uses mesoporous activated alumina with high surface area.
Excellent Mechanical Strength
Industrial catalyst support must resist crushing, attrition, and thermal shock. Our activated alumina beads (1–5 mm) have crush strength >80 N, and extruded gamma alumina (1/16″–1/8″) exceeds 100 N. As an alumina carrier, our shaped products maintain integrity under high liquid velocities (up to 50 m³/m²·h). Alumina adsorbent grades are tested for attrition loss (<0.5 wt% in air jet test).
Thermal and Chemical Stability
Activated alumina withstands regeneration temperatures up to 600°C without phase transformation to alpha. Gamma alumina is stable in reducing and mildly acidic environments. As a catalyst support, it resists sulfur and nitrogen poisoning better than many zeolites. Alumina adsorbent can be regenerated by heating to 200–350°C, restoring adsorption capacity over hundreds of cycles.
Surface Acidity Control
The surface of activated alumina contains both Lewis and Brønsted acid sites. Gamma alumina acidity can be modified by adding dopants (silica, magnesia, boron). As a catalyst support, this allows tuning of cracking and isomerization activity. For alumina carrier applications where neutrality is desired, high-purity activated alumina with low residual sodium is used.
Types of Activated Alumina
Gamma Alumina Powder
Gamma alumina powder (typically 20–100 µm) is the raw material for manufacturing shaped catalyst support and alumina carrier products. It is produced by flash calcination of aluminum hydroxide (gibbsite or bayerite) or by controlled dehydroxylation of boehmite. Our activated alumina powder has surface area 200–300 m²/g, Na₂O <0.05%, and loose bulk density 0.7–0.9 g/mL. It serves as a binder in FCC catalysts and as a starting material for extrudates.
Spherical Activated Alumina
Spherical activated alumina beads (1–8 mm diameter) are produced by oil-drop or rotating pan methods. They are widely used as an alumina adsorbent for fluoride removal from drinking water, drying of compressed air, and purification of hydrogen peroxide. As a catalyst support, spheres offer low pressure drop and uniform flow distribution. Our gamma alumina spheres have crush strength 80–150 N, surface area 250–320 m²/g, and attrition loss <0.3%. They can be impregnated with metals to form alumina carrier catalysts for selective hydrogenation.
Extruded Activated Alumina
Extrudates (cylinders, trilobes, quadrilobes) are the most common catalyst support shapes for fixed-bed reactors. Our activated alumina extrudates are available in 1/16″, 1/8″, 3/16″ diameters. Gamma alumina extrudates have high crush strength (100–250 N/cm) and low dust. As an alumina carrier, they are impregnated with Co-Mo, Ni-Mo, or Ni-W for hydrotreating. Alumina adsorbent extrudates are used in bulk drying towers and TSA units.
High-Purity Activated Alumina
For sensitive catalytic applications (e.g., reforming, Claus catalysts), low-sodium activated alumina (Na₂O <0.02%) is required. Our high-purity gamma alumina is produced from aluminum alkoxide-derived boehmite. As a catalyst support, it minimizes undesirable side reactions and extends catalyst life. This alumina carrier grade is also used in pharmaceutical and food-contact drying applications.
Modified Activated Alumina
Doped activated alumina grades include silica-alumina (acidic support for cracking), magnesia-alumina (basic support for Claus reaction), and titania-alumina (for specific chemisorption). These catalyst support materials offer tailored surface chemistry. Gamma alumina with phosphorus or boron modification is used in specialized alumina adsorbent applications for selective ion exchange.
Applications of Activated Alumina
Hydrotreating Catalyst Supports (HDS, HDN, HDM)
The largest application of activated alumina is as a catalyst support for hydrodesulfurization (HDS), hydrodenitrogenation (HDN), and hydrodemetallization (HDM) catalysts. Gamma alumina extrudates impregnated with Co-Mo or Ni-Mo remove sulfur from diesel and gasoline to ultra-low levels (<10 ppm). The alumina carrier provides high surface area for metal sulfide dispersion and resists sulfur poisoning. Our activated alumina supports for HDS feature 8–12 nm pores and high crush strength.
Claus Catalysts for Sulfur Recovery
In Claus plants recovering sulfur from H₂S-rich acid gas, activated alumina serves as both a catalyst support and a direct alumina adsorbent. Gamma alumina catalyzes the Claus reaction (2H₂S + SO₂ → 3S + 2H₂O) and also hydrolyzes COS and CS₂. Spherical activated alumina Claus catalysts have high surface area (250–350 m²/g) and excellent resistance to sulfation. Our alumina carrier for Claus units can be regenerated by controlled burn-off.
Fluoride Removal from Drinking Water
Activated alumina is the EPA-recommended alumina adsorbent for defluoridation of groundwater. The gamma alumina surface adsorbs fluoride ions (F⁻) via ligand exchange with surface hydroxyls. As an alumina carrier in fixed-bed filters, activated alumina reduces fluoride from 5–10 mg/L to <1.5 mg/L. Our alumina adsorbent beads (0.5–2 mm) are optimized for high capacity (4–8 mg F/g) and can be regenerated with dilute NaOH.
Compressed Air and Gas Drying
Activated alumina is a standard alumina adsorbent for drying compressed air, natural gas, and industrial gases to dew points of -40°C to -60°C. Compared to silica gel, gamma alumina has higher crush strength and does not dust. As a catalyst support in dryers, it also removes oil mist and particulates. Our activated alumina for gas drying has surface area 280–350 m²/g, water capacity >15 wt% at 80% RH, and can be thermally regenerated.
Hydrogen Peroxide Purification
Crude hydrogen peroxide (H₂O₂) contains organic impurities (anthraquinones) that must be removed. Activated alumina functions as an alumina adsorbent to adsorb these organics, producing high-purity H₂O₂ for electronics and textile bleaching. Gamma alumina beads or extrudates are used in fixed-bed adsorbers. Our alumina carrier grades for H₂O₂ purification have low heavy metal content to prevent decomposition.
Catalytic Reforming Supports
In catalytic reforming (Platforming, CCR), activated alumina is the catalyst support for Pt-Re, Pt-Sn, or Pt-Ir bimetallic catalysts. Gamma alumina with controlled acidity and low sulfur content promotes dehydrogenation and isomerization without excessive cracking. The alumina carrier must withstand high temperatures (500–550°C) and frequent regeneration. Our high-purity activated alumina for reforming has Na₂O <0.01% and high thermal stability.
Selective Adsorption of Arsenic and Selenium
Activated alumina is effective as an alumina adsorbent for removing arsenic (As³⁺, As⁵⁺) and selenium from industrial wastewater and drinking water. The gamma alumina surface forms inner-sphere complexes with oxyanions. As an alumina carrier, it can be impregnated with iron or manganese oxides to enhance capacity. Our alumina adsorbent for heavy metals has high surface area and fast kinetics.
Catalyst for Alcohol Dehydration
Gamma alumina itself is an active catalyst support and also a catalyst for dehydration of alcohols to olefins (e.g., ethanol to ethylene). Activated alumina’s acidity promotes elimination reactions. As an alumina carrier for other metals, it finds use in methanol-to-dimethyl ether (DME) processes.
Why Choose Our Activated Alumina Products
We provide high-quality activated alumina with consistent purity, surface area, and mechanical properties. Our catalyst support grades are designed for easy impregnation and high metal dispersion. Gamma alumina products are characterized by XRD, BET, and mercury porosimetry. As an alumina carrier, we offer custom shaping and sizing. Our alumina adsorbent lines are tested for dynamic adsorption capacity and regeneration stability.
Strict Quality Control
Every batch of activated alumina is tested for surface area (BET), pore volume (BJH), crush strength, attrition loss, bulk density, and chemical composition (XRF). Gamma alumina is analyzed for phase purity (no alpha or boehmite impurities). Catalyst support materials receive water absorption and point of zero charge (PZC) measurement. Alumina adsorbent grades undergo fluoride capacity or water isotherm testing.
Multiple Product Specifications
We supply activated alumina in bead sizes: 0.5–1 mm, 1–2 mm, 2–3 mm, 3–5 mm, 4–6 mm. Extrudates: 1/16″, 1/8″, 3/16″ and trilobe shapes. Gamma alumina powder: D50 5–20 µm or 20–50 µm. Custom catalyst support formulations available (silica-doped, magnesia-doped). Alumina carrier with specified pore size (8 nm, 12 nm, 18 nm, 25 nm) is stocked. Alumina adsorbent for fluoride comes in ready-to-use filter media grades.
Global Technical Support
Our application engineers assist with catalyst impregnation protocols, bed loading calculations, and troubleshooting of pressure drop or capacity loss. For activated alumina in gas drying, we provide dew point curves and breakthrough simulations. For catalyst support selection, we offer metal dispersion predictions based on pore size. Gamma alumina users receive calcination guidelines for optimal phase development.
Future Trends of Activated Alumina
Demand for activated alumina as a catalyst support continues to grow with stricter fuel sulfur regulations and the shift toward renewable feedstocks (co-processing of bio-oils). Gamma alumina with hierarchical porosity (meso/macro) is being developed for biomass-derived feeds containing large molecules. Alumina carrier technology is advancing toward 3D-printed monoliths with optimized flow. Alumina adsorbent applications for PFAS (forever chemicals) removal are emerging. Our R&D team is actively developing low-cost, high-capacity activated alumina for water treatment and carbon capture.
Conclusion
High-quality activated alumina products serve as essential catalyst support materials, active gamma alumina phases, durable alumina carrier substrates, and effective alumina adsorbent media. Whether you need activated alumina for hydrotreating catalysts, catalyst support for Claus sulfur recovery, gamma alumina for gas drying, alumina carrier for reforming, or alumina adsorbent for fluoride removal, our comprehensive portfolio delivers consistent performance and long service life.
As an experienced manufacturer of activated alumina, we offer custom pore architectures, shapes, and purity levels. Contact us to discuss your catalyst support, gamma alumina, alumina carrier, or alumina adsorbent requirements.
