Gamma activated alumina, was called " activated alumina", is a kind of porous high dispersion solid material.
γ-Al2O3 has the advantages of adjustable pore structure, large specific surface area, good adsorption performance, acidic surface and good thermal stability. The microporous surface has the properties necessary for catalysis, so it is used in various fields.
1. Catalysts and catalyst carriers
Petrochemicals: widely used as catalyst carriers for hydrogenation, dehydrogenation, cracking, isomerization and other reactions (such as catalysts in petroleum cracking).
Automobile exhaust purification: as a carrier of three-way catalyst (TWC).
Industrial catalysis: catalysts or carriers used for reactions such as synthetic ammonia and methanol preparation.
2. Adsorption and separation
Desiccant: adsorbs water molecules for dehydration of gas or liquid.
Pollutant removal: adsorbs heavy metal ions or organic pollutants in wastewater.
Chromatographic separation: as a chromatographic column filler, used to separate and purify chemicals.
3. Materials Science
Ceramics and composite materials: as a reinforcing phase or sintering aid to improve the mechanical properties and thermal stability of ceramics.
Coating materials: used for the preparation of wear-resistant and high-temperature resistant coatings.
4. Electronics and Energy
Lithium-ion batteries: as separator coating or electrode material additive to improve battery safety and performance.
Supercapacitors: using its high specific surface area as electrode material.
5. Biomedicine
Drug carriers: loading drugs to achieve sustained release or targeted delivery.
Biosensors: used to immobilize enzymes or antibodies to enhance detection sensitivity.
Gamma-Al2O3 is widely used as catalyst carrier because of the adjustability of its pore structure and surface acidity. When γ- Al2O3 is used as a carrier, besides can have the effects to disperse and stabilize active components, also can provide acid alkali active center, synergistic reaction with the catalytic active components. The pore structure and surface properties of catalyst depend on γ-Al2O3 carrier, so high performance carrier would be found for specific catalytic reaction by controlling the properties of gamma alumina carrier.
Gamma activated alumina is generally made of its precursor pseudo-boehmite through 400~600℃ high temperature dehydration, so the surface physicochemical properties is largely determined by its precursor pseudo-boehmite, but there are many ways to make pseudo-boehmite, and different sources of pseudo-boehmite leads to the diversity of gamma – Al2O3. However, to those catalysts with special requirements to alumina carrier, only rely on the control of precursor pseudo-boehmite is difficult to achieve, must be taken to prophase preparation and post processing combining approaches to adjust the properties of alumina to meet different requirements. When the temperature is higher than 1000 ℃ in use, alumina occurs following phase transformation: γ→δ→θ→α-Al2O3, among them γ,δ,θ are cubic close packing, the difference only lies in the distribution of aluminum ions in tetrahedral and octahedral, so these phase transformation does not cause much variation of the structures. Oxygen ions in alpha phase are hexagonal close packing, aluminum oxide particles are grave reunion, specific surface area declined considerably.
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FAQ：
Q: How to store alumina?
A: Firstly, Avoid moisture, avoid scrolling, throw and sharp shocking during transportation, rainproof facilities should be readied. Then it should be stored in dry and ventilated warehouse to prevent contamination or moisture.
Q: How long is the service life?
A: Usually, it is at least 2 years or 8000 hours. As our experience, 5 years is no issue for ours.
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